Compositions and methods thereof increasing plant growth and resistance to environmental stress

Abstract

Compositions and methods for enhancing plant growth and resistance to adverse abiotic conditions are disclosed.

Description

FIELD OF THE INVENTION

This invention relates to the fields of agriculture and propagation of plants under abiotic stress conditions. More specifically, the invention provides methods and microbial based compositions which facilitate improved plant growth and stress tolerance.

BACKGROUND OF THE INVENTION

Several publications and patent documents are referenced throughout this application in order to more fully describe the state of the art to which this invention pertains. The disclosure of each of these publications and patent documents is incorporated by reference herein.

Pine barrens (pinelands) comprise a unique type of eco-system that is oligotrophic, and both drought- and fire-prone. Pine barrens occur throughout northeastern USA from New Jersey to Maine (Forman et al. 1998). Pines and oaks are the most common trees in pine barrens, while the understory is composed of grasses (Poaceae), sedges (Cyperaceae), blueberries and other members of heath family (Ericaceae). The largest and most uniform area of pine barrens in the United States is the 1.4 million acre pine barrens of New Jersey, where the soil is highly acidic, sandy and nutrient poor.

Dark septate endophytes (DSE) refer to a group of heterogeneous plant root-colonizing ascomycetes that produce melanized, septate hyphae. They have been isolated from over 110 plant families that grow in various environments (Knapp et al. 2012). The best studied DSE are the Phialocephala fortinii-Acephala applanata complex (PAC), a group of asexual fungi in Helotiales of Leotiomycetes (Wang et al. 2006). Fungi in PAC are characterized by darkly pigmented hyphae, and typically produce branched conidiophores, hyaline phialides with collarettes, and intracellular microsclerotia (Grünig et al. 2008a, 2008b; Yu et al. 2001). PAC are the common root associates of many tree species, specifically conifers in forests of the northern hemisphere (Grünig et al. 2008a, 2008b; Menkis 2004). Despite the global pervasiveness of DSE, their ecological roles, phylogenetic relationships and taxonomy remain poorly understood (Knapp et al. 2012; Mandyam and Jumpponen 2005). DSE fungal-plant interaction studies have yielded variable results, likely due to the use of differing experimental design strategies (Grünig et al. 2008b).

It is estimated that 30% of the world's total land area consists of acid soils, and 50% of the world's potential arable lands are acidic (Tuininga et al. 2004). In view of these adverse environmental conditions, improved methods to enhance growth of both edible and non-edible plants are needed.

SUMMARY OF INVENTION

In accordance with the present invention, a method for enhancing overall plant growth and resistance to adverse abiotic conditions comprising contacting a plant or seed therefrom with a composition comprising a biofertilizer comprising at least one endophytic fungi and optionally bacteria. In one aspect, the fungi is Acidomelania panicicola and the optional bacteria is from the Burkholderia genus. The method can include inoculating the seeds with the fungi and, or bacteria in agar or growth medium and placing seeds/agar composition in the soil. In another approach, after mixing the cultures, the seeds and cultures are subjected to drying to form a coating thereon. Vermiculite and rock phosphate may also be included in the composition to enhance plant growth and resistance to abiotic stress. The method can be applied to both monocots and dicots and can be used on plants which include without limitation, lettuce, corn, rice, soybeans, potatoes, barley, wheat, and carrots. In a particularly preferred embodiment, the plant is a turfgrass plant selected from a Ryegrass, Kentucky Bluegrass, Tall Fescue, Bermuda, St. Augustine or Zoysia plant or any other turfgrass plant.

In another aspect of the invention, a biofertilizer composition is provided. An exemplary biofertilizer includes an effective amount of A. panicicola and at least one agent or microorganism for promoting plant growth and resistance to abiotic stresses for use in the method described above. In a preferred embodiment, the composition contains A. panicicola and at least one Burkholderia species in equal concentrations. The composition may also contain a sun protecting product and a polysaccharide solution. The fungal strains may also be encapsulated in allignate beads.

In yet another aspect of the invention the fungus for use in the method is selected from the Barrenia genus. In a preferred embodiment, the fungi is Barrenia panicia. This composition may also comprise a bacteria selected from the Burkholderia genus.

The biofertilizer composition comprising at least A. panicicola and, or Barrenia and, optionally, other agents or microbial or fungal species are effective to enhance plant resistance to environmental stresses. Such agents may include gel formulations, agar, vermiculite, sun protectorants, rock phosphate, alginate, which when combined form an efficacious biofertilizer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1. Maximum likelihood phylogenetic tree inferred from the large subunit of rRNA gene sequence. Bootstraps higher than 70 have thickened branches.

FIG. 2. Maximum likelihood phylogenetic tree inferred from the internal transcribed spacer sequences of rRNA gene. Bootstraps higher than 70 have thickened branches.

FIG. 3. Maximum likelihood phylogenetic tree inferred from combined ITS, LSU, and RPB1 gene sequence datasets. Bootstraps higher than 70 have thickened branches.

FIG. 4. DNA sequence for A. applanata AY078151; SEQ ID NO: 1 (FIG. 4A), A. panicicola KF874620; SEQ ID NO: 2 (FIG. 4B), A. panicicola KF874619; SEQ ID NO: 3 (FIG. 4C), A. panicicola AL5m2-2; SEQ ID NO: 4 (FIG. 4D), A. panicicola CM11M2; SEQ ID NO: 5 (FIG. 4E), A. panicicola WSF1-R37; SEQ ID NO: 6 (FIG. 4F), A. taeda CM14-P64; SEQ ID NO: 7 (FIG. 4G), A. taeda WSF14-P22; SEQ ID NO: 8 (FIG. 4H), A. taeda WSF14-P13; SEQ ID NO: 9 (FIG. 4I), C. clavus DQ491502; SEQ ID NO: 10 (FIG. 4J), D. acerina AF141164; SEQ ID NO: 11 (FIG. 4K), H. aureliella JN943611; SEQ ID NO: 12 (FIG. 4L), L. virgineum DQ491485; SEQ ID NO: 13 (FIG. 4M), L. macrospores DQ471005; SEQ ID NO: 14 (FIG. 4N), M. cinerea DQ491498; SEQ ID NO: 15 (FIG. 4O), M. laxa EF153017; SEQ ID NO: 16 (FIG. 4P), P. fortinii AB671499; SEQ ID NO: 17 (FIG. 4Q), and V. truncorum EU434855; SEQ ID NO: 18 (FIG. 4R).

FIGS. 5A-5E. Switchgrass seedling two days after inoculation with Acidomelania panicicola holotype isolate 61R8 (FIG. 5A); Control (FIG. 5B); three days after inoculation with Barrenia panicia holotype isolate WSF1R37 (FIG. 5C); Control (FIG. 5D), Barrenia taeda holotype isolate WSF14P22 (FIG. 5E). Bar=1 mm

FIGS. 6A-6C. Representative image of morphological characters of Barrenia panicia holotype isolate WSF1R37 (FIG. 6A); Representative image of morphological characters of Barrenia panicia holotype isolate WSF1R37 (FIG. 6B); Representative image of morphological characters of Barrenia panicia holotype isolate WSF1R37 (FIG. 6C). A-Bar=10 μm

FIG. 7. Micrographs of control and Acidomelania panicicola inoculated switchgrass seedling roots 2 days post inoculation.

FIG. 8. Micrographs of control and Acidomelania panicicola inoculated rice seedling roots 4 days post inoculation.

FIG. 9. Micrographs showing control, Fusarium oxysporum inoculated and Acidomelania panicicola inoculated switchgrass seedling survival percentage.

FIG. 10. Micrographs showing control, Fusarium oxysporum inoculated and Acidomelania panicicola inoculated switchgrass roots.

FIG. 11. Micrographs showing control and Acidomelania panicicola inoculated lettuce roots 4 days post inoculation.

DETAILED DESCRIPTION OF THE INVENTION

Drought and low nutrient stress typified early terrestrial environments when plant colonization of land occurred and was facilitated by root-symbiotic fungi (Stoyke et al. 1991). Beneficial endophytes encompass bacteria and fungi that have the ability to alleviate abiotic stresses in combination with plant growth promotion. Endophytes have been reported to enhance early root differentiation, improve drought and salinity tolerance and increased survival rate. These endophytes play critical roles in litter decomposition, nutrient absorption and cycling (Forman et al. 1998; Blackwell et al. 2011).

A group of new fungal species were discovered from switchgrass and other grass roots in the New Jersey Pine Barrens, which is a dry, highly acidic environment, low in nutrients (P, K, organic matter etc.), with high aluminum toxicity (von Uexkull et al. 1995). Herein we describe two new genuses, Acidomelania and Barrenia, discovered in pine barren switchgrass roots.

Barrenia was classified using multi-gene phylogenetic analyses, along with phenotypic and ecological characteristics. While the new species was isolated from roots of switchgrass and pitch pine in the acidic and oligotrophic New Jersey Pine Barrens, Barrenia likely has a wide distribution as its internal transcribed spacer (ITS) sequence has high similarity with a number of GenBank sequences obtained in various ecological studies. The majority of these similar ITS sequences were obtained from roots in plants growing in acidic, nutrient-poor environments, as well as from managed sugarcane plantations. Phylogenetic analyses of ITS, LSU and RPB1 sequence data strongly support that Barrenia is a monophyletic Clade in Helotiales, distinct from any known taxa. Barrenia is phylogenetically close to Acidomelania, Loramyces, Mollisia, and Phialocephala fortinii-Acephala applanata species complex (PAC), the dark septate endophytes. Barrenia can be distinguished from Loramyces and Mollisia by its association with living plant roots. While taxa in PAC also are root endophytes, they have complex phialid arrangements that appear to be lacking in Barrenia.

The present inventors have performed functional studies which demonstrate that application of biofertilizers comprising Acidomelania panicicola and Barrenia panicia significantly enhanced dense root hair growth in switchgrass. Acidomelania pancicola plant-fungal interactions with rice and lettuce seedlings under acidic and poor nutrient conditions also resulted in a significant promotion of root and shoot length.

In one aspect of the invention, a biofertilizer composition is prepared by inoculating seeds with fungi (e.g. Acidomelania panicicola or any fungus selected from the genus Barrenia) on agar or growth medium and placing seeds and agar in the soil. In another aspect of the invention, a biofertilizer composition is prepared by mixing fungi and bacterial cultures with seeds prior to placing seeds in the soil, the cultures optionally forming a coating around the seeds. In a third aspect of the invention, seeds are mixed with fungi and bacterial cultures and dried. In a fourth aspect of the invention, seeds are grown in fungal inoculated soil formulated with vermiculite and rock phosphate.

DEFINITIONS

An endophyte is an endosymbiont, often a bacterium or fungus, that lives within a plant without causing apparent disease. Endophytes may enhance a plant's growth and improve the plant's ability to tolerate abiotic stresses such as drought or harsh soil conditions. In one embodiment an endophyte useful herein comprises the fungus, Acidomelania panicicola. In another embodiment, an endophyte comprises Barrenia panicia. Endophytes useful herein include the fungus Acidomelania panicicola in combination with certain bacteria selected from the bacterial species, Burkholderia. In yet another approach, the fungi Acidomelania panicicola and the fungi Barrenia panicia are used in combination to enhance plant growth under abiotic stress conditions.

The term “abiotic” includes non-living chemical and physical parts of the environment that affect ecosystems. An ecosystem's abiotic factors may be classified via “SWATS” (Soil, Water, Air, Temperature, Sunlight).

The term “biofertilizer” comprises at least one substance containing living microorganisms which, when applied to seed, plant surfaces, and/or soil, colonizes the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant. Biofertilizers can also comprise other agents which enhance the growth of the microorganisms present. Such agents include, without limitation, agar, gel, and minerals.

The term “crop” herein refers to any plant grown to be harvested or used for any economic purpose, including for example human foods, livestock fodder, fuel or pharmaceutical production.

The following materials and methods provided to facilitate the practice of the present invention.

Fungal Isolation

Poaceae grass roots were collected from three locations (N 40 12.00, W 74 30.00; N40 04.084, W74 26.696; and N 39 46.136, W 74 40.885) in New Jersey Pine Barrens in 2012 and 2013. Native pitch pine (Pinus rigida) roots were collected from two locations (N40 04.084, W74 26.696; and N 39 46.136, W 74 40.885) in New Jersey Pine Barrens in 2014 (Tables 1 and 2). Soil pH of the sampling locations ranged from 4.7 to 5.2. Root samples were rinsed thoroughly to remove soil from the surface, cut into 10-20 mm pieces then surface disinfected with sequential washes of 95% ethanol for 30 s, 0.5% NaOCl for 2 min and 70% ethanol for 2 min. After several rinses with sterile water and drying, the root samples were cut into 5 mm pieces and plated on acidified malt extract agar (AMEA, 1.5 ml 85% lactic acid per liter of 2% malt extract agar). Plates were incubated at room temperature with 12 h light and 12 h dark cycles. Fungal cultures were transferred to fresh AMEA and purified by sub-culturing from emergent hyphal tips.

TABLE 1
			Morphological	Type		Known
Species	MycoBank #	Etymology	description	species	Habitat	distribution
Barrenia E.	MB811715	″Barren″	Colonies on MEA	Barrenia	Endophytic	New Jersey
Walsh & N.		refers to the	darkly pigmented,	panicia	in roots of	Pine
Zhang, gen.		pine barrens	surface fluffy,		Poaceae	Barrens,
nov.		ecosystem	aerial hyphae thick		grasses	United
		where the	and light brown.			States
		fungi were	Colonies on WA
		discovered	light brown; sparse
			aerial hyphae.
			Sporulation not
			observed

TABLE 2
					Other
					materials
Species	MycoBank #	Etymology	Morphological Description	Holotype	examined
Barrenia	MB811716	“panici”	Colonies on MEA 55 mm	United States:	United States:
panicia		refers to the	diam after 20 d in the dark at	New Jersey:	New Jersey:
E. Walsh		host	25 C., Cinnamon Brown,	Wharton State	Assunpink
& N. Zhang,			surface fluffy, aerial hyphae	Forest, N 39	Lake, N 40
sp. nov.			thick and light brown,	45.346, W 074	12.00, W 74
			reverse pigmented, Warm	41.684, 3 m	30.00, 3 m alt.,
			Sepia. Colonies on WA	alt., from roots	from roots of
			reaching 51 mm diam after	of Panicum	Digitaria sp.,
			20 d in the dark at 25 C.,	virgatum, 5	30 Aug. 2012,
			Ochraceous Tawny, aerial	Jun. 2013, E. Walsh	E. Walsh & N. Zhang
			hyphae sparse, reverse	& N. Zhang,	AL5m2;
			pigmented, Cinnamon	WSF1R37	Colliers Mills,
			Brown. Warm Sepia, paddle-	(RUTPP-	N40 04.084
			shaped hyphopodium-like	WSF1R37)	W74 26.696, 5 m
			structures formed in		alt., from
			inoculated switchgrass root		roots of Coix
			tissue		lacryma - jobi,
					30 Aug. 2012,
					E. Walsh & N. Zhang
					CM11m2
Barrenia	MB811717	“taeda”	Colonies on MEA 28 mm	United States:	United States:
taeda E. Walsh &		means pine	diam after 20 d in the dark at	New Jersey:	New Jersey:
N. Zhang,		wood and	25 C., Cinnamon Brown,	Wharton State	Wharton State
sp. nov.		refers to the	surface fluffy, aerial hyphae	Forest N 39	Forest, N 39
		host	thick and light brown,	45.346, W 074	45.346, W 074
			reverse pigmented, Mummy	41.684, 3 m	41.684, 3 m
			Brown. Colonies on WA	alt., from roots	alt., from roots
			reaching 31 mm diam after	of Pinus rigida,	of Pinus rigida,
			20 d in the dark at 25 C.,	26 Jun. 2014,	26 Jun. 2014,
			Buckthorn Brown, sparse	E. Walsh & N. Zhang	E. Walsh & N. Zhang
			aerial hyphae, reverse	WSF14P22	WFS14P13;
			pigmented, Buckthorn	(RUTPP-	Colliers Mills,
			Brown. Sporulation not	WSF14P22)	N40 04.084
			observed		W74 26.696, 5 m
					alt., from
					roots of Pinus
					rigida, 4 Jun.
					2014, E. Walsh
					& N. Zhang
					CM14P64

Morphological Study and Growth Rate

Purified fungal isolates were grown on cellophane overlaid with 2% MEA (BD Difco, Maryland) and 2% water agar (WA). Cultures were incubated at 20° C. in the dark with three replicates. Colony diameter was measured after 20 days. The color names of colonies followed Ridgway (1912).

DNA Extraction, Amplification and Sequencing

Genomic DNA was extracted from fungal mycelium using the UltraClean Soil DNA isolation kit (MoBio, California) following the manufacturer's instructions. PCR was performed with Taq 2X Master Mix (New England BioLabs, Maine), following the manufacturer's instructions. PCR cycling conditions for the internal transcribed spacer (ITS) and the large subunit of ribosomal RNA genes (LSU) consisted of an initial denaturation step at 95° C. for 2 min, 35 cycles of 95° C. for 45 s, 54° C. for 45 s, 72° C. for 1.5 min, and a final extension at 72° C. for 5 min. For the largest subunit of RNA polymerase II (RPB1), the cycling conditions included an initial denaturation step at 95° C. for 2 min, 35° cycles of 95° C. for 60 s, 55° C. for 1.5 min, 72° C. for 2 min, and a final extension at 72° C. for 10 min. Primers used in this study are as follows: ITS1 and ITS4 for the ITS region (White et al. 1990), ITS1 and LR5 for the LSU locus (Rehner and Samuels 1995), and RPB1 Af (Hall and Stiller 1997) and RPB1 CrRev (Matheny et al. 2002) for the RPB1 gene. PCR products were purified with ExoSAP-IT (Affymetrix, California) and sequenced with the PCR primers by Genscript Inc. (Piscataway, N.J.).

Sequence Alignment and Phylogenetic Analyses

Six representative isolates of the new taxon (CM11m2, CM14P64, AL5m2, WSF1R37, WSF14P13, and WSF14P22) as well as other reference Leotiomycetes species (Table 3) were included in the phylogenetic analyses. The ITS dataset included sequences of the six new isolates from this study and 15 reference sequences of Helotiales. The LSU dataset included the six new sequences and 28 reference sequences of Helotiales and Rhytismatales. The three-gene (ITS, LSU and RPB1) alignment included the six new sequences and 12 reference sequences of. Sequences were aligned with MUSCLE (Edgar 2004). Maximum likelihood (ML) tree was generated with MEGA 6 (Tamura et al. 2013). Models with the lowest BIC scores (Bayesian Information Criterion) were considered to describe the substitution pattern the best. The best models for LSU, ITS and three-gene datasets were Tamura-3 parameter, Kimura 2-parameter, Kimura 2-parameter, respectively. Initial tree(s) for the heuristic search were obtained automatically by applying Neighbor-Join and BioNJ algorithms to a matrix of pairwise distances estimated using the Maximum Composite Likelihood approach, and then selecting the topology with superior log likelihood value. A discrete Gamma distribution was used to model evolutionary rate differences among sites. Bootstrap was computed for 500 replications. All positions containing gaps and missing data were excluded from the analyses.

TABLE 3
Species name, isolate number, host, location and GenBank accession numbers of the fungi used in this
study.
	Isolate
Species	number a	Host	Location	ITS	LSU	RPB1
Acephala	CBS109321	Picea abies,	Büdmerenwald,	AY078145	KF951051	AFTOL
applanata		root	Switzerland			3613
Acephala	CBS123555	Pinus	Hubertusstock,	HM189719
macrosclerotium		sylvestris, root	Germany
Acidomelania	CBS137156	Panicum	New Jersey	KF874619	KF874622	—
panicola		virgatum, root	Pine Barrens,
			USA
Acidomelania	CM16s1	Schizachyrium	New Jersey	KF874620	KF874621	—
panicola		scoparium,	Pine Barrens,
		root	USA
Barrenia	AL5m2	Digitaria sp.,	New Jersey	—	—	—
panicia		root	Pine Barrens,
			USA
Barrenia	CM11M2	Coix lacrymajobi,	New Jersey	—	—	—
panicia		root	Pine Barrens,
			USA
Barrenia	WSF1R37	Panicum	New Jersey	—	—	—
panicia		virgatum, root	Pine Barrens,
			USA
Barrenia taeda	CM14P64	Pinus rigida,	New Jersey	—	—	—
		root	Pine Barrens,
			USA
Barrenia taeda	WSF14P13	Pinus rigida,	New Jersey	—	—	—
		root	Pine Barrens,
			USA
Barrenia taeda	WSF14P22	Pinus rigida,	New Jersey	—	—	—
		root	Pine Barrens,
			USA
Botryotinia			Oregon, USA		AY544651
fuckeliana
Bulgaria	CBS118.31		Germany		DQ470960	AFTOL916
inquinas
Chloroscypha			Oregon, USA	U92311
chloromela
Chlorovibressea			New Zealand		DQ257352
sp.
Collembolispora		foam in stream	Nova Ves,		KC005811
aristata			Czech Republic
Cudoniella	AFTOL166	Hemlock cones	Benton County,		DQ470944	DQ471128
clavus		and small	Oregon, USA
		sticks
Dermea acerina	CBS161.38	Acer rubrum	Bear Island,	AF141164	DQ247801	DQ471164
			Ontario,
			Canada
Fabrella tsugae					AF356694
Hyaloscypha			Scotland	JN943611	EU940152	JN985241
aureliella
Hyaloscypha			Kaarina,	FJ477059	FJ477058
vitreola			Finland
Lachnum	AFTOL49	Alnus sp.,	Oregon, USA	DQ491485	AY544646	DQ842030
virgineum		cones
Lambertella	CBS811.85	Aster	Honshu, Japan		DQ470978
subsubrenispora		ageratoides
		var. ovata
Leotia lubrica	AFTOL1	Chrysolepis	Oregon, USA		AY544644
		chrysophyla
Loramyces	CBS235.53	Equisetum	UK	DQ471005	DQ470957	DQ471149
macrosporus		limosum
Microglossum	AFTOL1292		Tennessee,		DQ470981	DQ471179
rufum			USA
Mollista cinerea	CBS122029	fallen log	Alsea Falls,	DQ491498	DQ470942	DQ471122
			Oregon, USA
Mollisia	ICMP18083	Actinidia	New Zealand		HM116757
dextrinospora		deliciosa cv.
		Hayward
Monilinia laxa	CBS122031				AY544670	FJ238425
Neobulgaria			Finland		EU940141
lilacina
Neobulgaria	CBS477.97	log with moss	New York,		FJ176865
pura			USA
Neofabrea	CBS122030	Malus sp.	Oregon, USA		AY544662
malicorticis
Phialocephala	CBS300.62	slime in pulp		AF486121	AB671465
dimorphospora		mill
Phialocephala	CBS443.86	Pinus	Suonenjoki,	AB671499	AB671466
fortinii		sylvestris, root	Finland
Phialocephala	CBS468.94	Picea abies,	Regensburg,	AF486126
scopiformis		bark	Germany
Spathularia		Tsuga	Tennessee,		FJ99786
velutipes		Canadensis	USA
Varicosporium			Svalbard,		JN941371
elodeae			Norway
Vibressea	CBS258.91	Populus,	Ontario,	EU434854	FJ176874	FJ238438
truncorum		submerged	Canada
		root
Acephala sp.c		Cymbidium	China	HQ889709
		insigne
Acephala sp.c		Sugarcane,	Brazil	GU973749
		root
Phialocephala		Rhododendron,	Smoky	JQ272328
sp.c		root	Mountain
			National Park,
			USA
a AFTOL = Assembling the Fungal Tree of Life project; ATCC = American Type Culture Collection, Manassas, Virginia, USA; CBS = Centraalbureau voor Schimmelcultures, Utrecht, The Netherlands; ICMP = International Collection of Micro-organisms from Plants, Lincoln, New Zealand.
b Numbers in boldface indicating new sequences from this study.
c Taxon name was copied from GenBank. Phylogenetic analysis in this study indicated that they belong to Barrenia.

Plant-fungal Interaction Experiment

Fungal isolates WSF1R37, WSF14P22, and A. panicicola isolate 61R8 were used in the seedling inoculation experiment. Switchgrass (‘Kanlow’) seeds were surface disinfected as follows: 95% ethanol for 30 s, 0.5% NaOCl for 1 min, 70% ethanol for 1 min, rinsed with sterile distilled H₂O and allowed to germinate in the dark at 25° C. for 3 days. Agargel (Sigma-Aldrich, USA) plates were made following manufacturer's instructions, and were cut in half, with one side removed. On the cut surface of an Agargel plate, three 10 mm×10 mm×5 mm plugs from a one-week old fungal culture grown on MEA were placed equidistance from one another. Germinated switchgrass seeds with visible radicle were then placed on the plugs. Sterile MEA plugs were used as negative control. Cultures were incubated at 25° C. under 12 hr light and dark cycle with nine replicates. Root length was measured 7 days after inoculation.

The following examples are provided to illustrate certain embodiments of the invention. They are not intended to limit the invention in any way.

EXAMPLE I

Barrenia, a New Genus Associated with Roots of Switchgrass and Pine in the Oligotrophic Pine Barrens, Promotes Root Hair Growth

A. Culture Morphology and Growth Rate

Isolate WSF1R37 produced dense Cinnamon Brown mycelium on MEA, and Ochraceous Tawny mycelium on WA. Colony diameter measurements for isolate WSF1R37 after 20 days were 75 mm on average on MEA with standard deviation (SD) of 2.6, and 47 mm on average on WA with SD of 2.6. Isolate WSF14P22 produced dense Cinnamon Brown mycelium on MEA, and Buckthorn Brown mycelium on WA. Colony diameter measurements for isolate WSF14P22 after 20 days were 28 mm on average on MEA with SD of 0.6, and 26 mm on average on WA with SD of 1.0.

B. Sequence Data and Phylogeny

There were 173 characters in the LSU alignment, 377 in ITS and 1291 in the three-gene alignment. Maximum likelihood trees based on LSU, ITS and three gene sequences are shown in FIGS. 1-3. All three phylogenies supported that the new isolates formed a monophyletic clade in Helotiales separated from any known taxa. The LSU tree indicated that they were close to Acidomelania panicicola, Loramyces macrosporus, Mollisia cinerea and PAC. The ITS tree showed that these new isolates were closely related to A. panicicola, M. cinerea, Phialocephala scopiformis and L. macrosporus. In the ITS tree, isolates WSF1R37, AL5m2, and CM11m2 formed a well-supported group, while isolates WSF14P22, WSF14P13, and CM14P64 formed another. The two groups were also recognized and supported by the LSU and RPB1 trees, and variation in the phylogenetic relationships of these isolates only occurred within the groups. DNA sequence information for the different fungal species is displayed in FIGS. 4A-4R.

Based on the molecular phylogenetic analyses, morphological characters and their ecological features, a new genus and two new species have been identified. Barrenia differs from Loramyces by its association with living plant roots while Loramyces species are associated with submerged dead plants (Digby and Goos 1987; Ingold and Chapman 1952; Weston 1929). Taxa in the PAC are also root endophytes, but they exhibit complex phialid arrangements that appear to be lacking in Barrenia. Barrenia also differs from Mollisia because of its lack of phialide producing conidia. Moreover, Barrenia has 93% or less ITS sequence similarity to the above-mentioned close relatives or any other described species with accessible ITS sequences. The two Barrenia species differ from each other on host and growth rate. The pine associated B. taeda exhibited slower growth than the grass associated B. panicia on both WA and MEA. There is a 96% similarity in ITS sequences between B. panicia and B. taeda.

C. Plant-Fungal Interaction Experiment

Switchgrass seedlings inoculated with A. panicicola isolate 61R8 and B. panicia WSF1R37 produced dense root hairs all the way to the root apical meristem area, while the control seedlings only produced dense root hairs at the region of maturation of the root (FIGS. 5A and 5C). In addition, the roots inoculated with A. panicicola isolate 61R8 and panicia WSF1R37 had a serpentine growth pattern, while the control roots were straight. Hyphopodia-like strutures were observed on the switchgrass seedling roots inoculated with B. panicia WSF1R37 (FIG. 6A-6C). Root length for seedlings inoculated with B. panicia WSF1R37 after 7 days were 17.4 mm on average with SD of 1.8, not significantly different from the control, which was 19 mm on average with SD of 5.1. Seedlings inoculated with B. taeda WSF14P22 showed no difference in root hair production with the control. Root length for B. taeda WSF14P22 after 7 days was 8.1 mm on average with SD of 1.6, which was significantly shorter than the control (FIG. 5E).

Discussion

Our recent survey on fungi associated with grass roots uncovered a number of novel DSE in Leotiomycetes from the pine barrens ecosystem (Luo et al. 2014a, 2014b; Walsh et al. 2014). Leotiomycetes are morphologically and ecologically diverse and the phylogenetic relationships within this class are not well resolved due to lack of molecular data (Wang et al. 2006). Based on the multi-locus phylogenetic analyses, the new genus Barrenia described here belongs to Helotiales, which encompasses plant pathogens, saprobes and endophytes. The dark, septate hyphal morphology of Barrenia spp., their root-colonizing habit and phylogenetic closeness to PAC indicate that they likely are also DSE.

The best studied DSE is the PAC, specifically P. fortinii. However, the ecological functions of PAC and other DSE remain elusive. Host-fungal interaction experiments often yielded inconsistent results under various experimental conditions in different laboratories (Mandyam and Jumpponen 2005). This prompted us to examine the interaction between B. panicia, B. taeda, A. panicicola and switchgrass, which is the host of B. panicia and A. panicicola. Our inoculation results indicated that A. panicicola and B. panicia remarkably promoted the root hair growth in switchgrass. In switchgrass roots, B. panicia produced hyphopodium-like structures, which may perform penetration and nutrient exchange function between the fungus and the host plant (Delaux et al. 2013; Walker 1980). Barrenia taeda, originally isolated from pine roots, had negative effect on root elongation in switchgrass seedlings. These results corroborate Mandyam et al. (2010; 2012) that while DSE fungi have a broad host range, their effects and characteristics can be considered host specific.

The phylogenetic analysis in this study indicated that Barrenia is close to Acidomelania, Loramyces, Mollisia, and PAC. The phylogenetic proximity of Mollisia, Loramyces and PAC was also supported by Zijlstra et al. (2005) and Wang et al. (2006). Barrenia can be distinguished from Loramyces and Mollisia by its association with living plant roots. While taxa in PAC also are root endophytes, morphologically they can be distinguished from Barrenia. In addition, Barrenia has 93% or less ITS sequence similarities to the above-mentioned close relatives or any other described species with accessible ITS sequences. The family placement of Barrenia is not determined here because the Leotiomycetes phylogeny is poorly resolved and several families in this class likely are polyphyletic (Wang et al. 2006).

The six Barrenia isolates from New Jersey Pine Barrens were grouped into two well-supported clades. We delimited the two species based on the genealogical concordance phylogenetic species recognition (Taylor et al. 2000). The BLAST results in GenBank indicated that Barrenia might have a wide distribution. Sixteen ITS sequences in GenBank had 97-99% identity with that of B. panicia isolate WSF1R37, for example, GU973749 from sugarcane root in Brazil, HQ889709 from Cymbidium insigne root in China, and AY599235 from grass root in The Netherlands. Twelve ITS sequences in GenBank had 97-99% identities with that of B. taeda isolate WSF14P22, for example, JQ272328 from Rhododendron root in USA and KJ817299 from Vaccinium vitis-idaea in Inner Mongolia. The host plants of the matched sequences in GenBank are largely Ericaceae, terrestrial orchids, grasses and conifers, usually found in acidic and infertile soils (Keddy 2007). This distribution pattern was also found in Acidomelania panicicola, the other root associated fungus frequently isolated from the pine barrens (Walsh et al. 2014).

Additional experiments to uncover fungal-plant interactions included the inoculation of switchgrass seedlings with A. panicicola isolate 61R8 and B. panicia WSF1R37 produced dense root hairs all the way to the root apical meristem area, while the control seedlings only produced dense root hairs at the region of maturation of the root. In addition, the roots inoculated with A. panicicola isolate 61R8 and B. panicia WSF1R37 had a serpentine growth pattern, while the control roots were straight. The plant growth promotion effect of A. panicicola and B. panicia discovered in this study coupled with their distribution pattern indicate that these species may play a role in plant adaptation to acid, low nutrient soils.

In conclusion, we discovered a new genus and two species of root-colonizing fungi associated with plants living in an acidic, nutrient poor environment. The phylogenetic and taxonomic work and the plant-fungal interaction results reported here will aid future ecological and evolutionary studies on root-associated fungi.

EXAMPLE II

Endophytic Fungi from Pine Barrens Grasses Promote Plant Growth in Acidic, High Aluminum Toxicity and Low Nutrient Conditions

A. Fungal Inoculation of Seeds on Agar

In this study, we performed functional studies that demonstrated that Acidomelania panicocola inoculation of seeds significantly increased root hair growth in switchgrass, rice and lettuce seedlings compared to the control.

To assess the effects of Acidomelania panicicola inoculation of switchgrass and rice seedlings on root hair abundance, fungus was grown on water agar under room temperature for 7 days. Seeds were germinated in sterile distilled water in a petri dish under room temperature in the dark for 7 days. Seedlings (roots down) were inserted in the 7 day-old fungal agar culture. Control seedlings were uninoculated but grown under the same conditions. Significant differences in root hair abundance were observed in inoculated seedlings when compared to negative, untreated controls (FIGS. 7 and 8). These findings indicate that Acidomelania panicicola inoculation enhances root hair abundance.

To evaluate switchgrass seedling survival percent and root and shoot length, switchgrass seeds were next inoculated with Acidomelania panicicola or Fusarium oxysporum or uninoculated using the method described above and agar and seedlings were covered with top soil. 6 days post-inoculation, Acidomelania panicicola inoculated seedlings exhibited a significant increase in survival (FIG. 9). Root and shoot length of switchgrass seedlings were visualized 8 days after inoculation when enhanced root and shoot length were observed (FIG. 10). These results demonstrate that colonization of switchgrass seedlings with Acidomelania panicicola enhances switchgrass growth and survival.

To assess the effects of Acidomelania panicicola inoculation on lettuce seed growth, seeds were inoculated and germinated as described above. Root length was assessed 4 days after inoculation. Increased root growth was observed for the inoculated lettuce seedlings (FIG. 11). These findings indicate that Acidomelania panicicola can enhance growth of edible plants.

B. Bacterial and Fungal Mixing and Inoculation of Seeds

Fungus (e.g. Acidomelania panicicola) is grown on water agar or other growth media under room temperature for 7 days. Bacterium (e.g. Burkholderia sp.) is cultured in Luria-Bertani broth (LB) overnight at 28° C. Seeds are mixed with the bacterial culture and the fungal cultures (ratio: 500 seeds: 10 mL overnight bacterial culture: 1 Petri dish 7 day old fungal culture) and placed on soil (e.g. Pine Barrens soil or other nutrient-poor soils). Seeds are then covered with top soil and grown under sufficient light.

C. Bacterial and Fungal Mixing, Inoculation and Drying of Seeds

Fungus (e.g. Acidomelania panicicola) is grown on water agar or other growth media under room temperature for 7 days. Bacteria (e.g. Burkholderia sp.) are grown in Luria-Bertani broth (LB) overnight at 28° C. Seeds are mixed with the bacterial culture and the fungal cultures (ratio: 500 seeds: 10 mL overnight bacterial culture: 1 Petri dish 7 day old fungal culture) and dried. Seeds are placed on soil (e.g. Pine Barrens soil or other nutrient-poor soils). Seeds are then covered with top soil and grown under sufficient light.

D. Bacterial and Fungal Mixing, Inoculation of Soil Formulated with Vermiculite and Rock Phosphate

Fungus (e.g. Acidomelania panicicola) is grown on water agar or other growth media under room temperature for 7 days. Bacterium (e.g. Burkholderia sp.) are grown in Luria-Bertani broth (LB) overnight at 28° C. Soil formulated with vermiculite and rock phosphate is inoculated with the fungal and bacterial cultures.

Discussion

Roots were an early development in plant life evolving on land during the Devonian Period (416 to 360 million years ago; (von Uexkull et al. 1995)). The fossil record and molecular phylogenetic analysis suggest that from the outset, mycorrhizal fungi played a crucial role in facilitating plant invasion of land, which was dry and poor in nutrients at the time of colonization (Gensel et al. 2001). Such drought and low nutrient stress continue to challenge plants living in many extant habitats.

We describe herein a novel endophytic fungi, Acidomelania panicicola, for use alone, and optionally in the presence bacteria, which enter the root-interior and colonize the tissues of the plant, thereby effectively promoting plant growth and survival. Given that there are limited techniques—both time consuming and cost-intensive—to prevent adverse effects of abiotic stressors on plant growth, the present studies demonstrating that application of a biofertilizer comprising Acidomelania to seeds or seedlings results in increased seedling survival rate, root hair abundance, and root and shoot length will have great utility for promoting plant growth under adverse environmental conditions.

EXAMPLE III

Liquid Formulation of the BioFertilizer for Seed Coating

This example provides a liquid formulation of biofertilizer, where the formulation consists of two separate solutions that are combined before use as a seed coating.

For the first solution, the fungi are grown in a 1 L flask using an adequate medium and are concentrated by centrifugation in order to separate the solid. This solid is then suspended in a minimum amount of media. A sun protecting product, such as Congo red or green colorant can also be added to the media at 1% (w/v).

According to one preferred embodiment, A. panicicola only is used for the first solution in similar initial concentrations. In a second embodiment, the first solution contains a fungus from the genus Barrenia only (e.g. B. panicia). In another embodiment, the first solution is comprised of A. panicicola and at least one fungus from the genus Barrenia (e.g. B. panicia). In another embodiment, the first solution contains a mixture of A. panicicola and at least one bacteria from the genus Burkholderia. In another embodiment, a mixture of B. panicia and at least one bacteria from the genus Burkholderia is contained within the first solution.

For the second solution, a 1% (w/v) solution of a polysaccharide, such as guar gum, gelan gum, pectin, carboxymetil cellulose, agar-agar, xantan gum (or other food hydrocolloid) is prepared to be used as sticker. The two solutions are then mixed together to treat plant seeds as a coating. The seed should be dried before planting and it is preferable to wait at least two hours after application prior to planting.

EXAMPLE IV

Solid State Formulation of the Biofertilizer of the Invention

This example provides a liquid formulation of a biofertilizer where the fungi and optionally bacteria are encapsulated and the fertilizer is in solid form. Alginate beads were prepared as follows: 1 ml of 30% glycerol was added to 1, 1.5 or 2% sodium alginate solution, depending on the alginate properties (M/G ratio) to obtain a final volume of 25 ml. Then, 250 ml of culture (obtained from a culture of A. panicicola only, a fungus from the genus Barrenia only (e.g. B. panicia), or a mixture of A. panicicola and Burkholderia, or a mixture of A. panicicola and Barrenia (e.g. B. panicia) was centrifuged, the cell pellet was washed with saline (0.85% NaCl, w/v) and suspended in 25 ml of alginate mixture and mixed thoroughly. This suspension was added drop wise into a pre-cooled sterile 1.5 or 2% (w/v) aqueous solution of CaCl₂ under mild agitation to obtain the fungal-alginate beads. These beads were allowed to harden for 2-4 h at room temperature. Beads were collected by sieving and were washed several times with sterile water and stored at 4° C. In order to preserve the formulation, the fresh wet beads were frozen at −80° C. prior to lyophilization at −45° C. for 15 h. The lyophilized dry beads were stored in sterile glass bottles.

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While certain of the preferred embodiments of the present invention have been described and specifically exemplified above, it is not intended that the invention be limited to such embodiments. Various modifications may be made thereto without departing from the scope and spirit of the present invention, as set forth in the following claims.

Claims

1. A biofertilizer composition for application to seeds, plant surfaces, and/or soil, comprising an effective amount of A. panicicola and at least one agent or microorganism for promoting plant growth and resistance to abiotic stresses, wherein the composition comprises alginate and is optionally used as a seed coating.

2. The biofertilizer composition of claim 1, wherein the composition contains A. panicicola and at least one Burkholderia species in equal concentrations.

3. The biofertilizer composition of claim 2, comprising, a sun protecting product.

4. The biofertilizer composition, according to claim 1, wherein said at least one microorganism is of the genus Barrenia.

5. The biofertilizer of claim 4, wherein said at least one microorganism of the genus Barrenia is Barrenia panicia.

6. The biofertilizer composition of claim 1, wherein the composition contains A. panicicola and at least one Barrenia species in equal concentrations.

7. The biofertilizer composition of claim 4, further comprising a sun protecting product and a polysaccharide solution.

8. The biofertilizer composition of claim 7, wherein the polysaccharide is selected from the group consisting of guar gum, gelan gum, pectin, carboxymetil cellulose, agar, and xanthan gum and contains 1% w/v of a polysaccharide.

9. The biofertilizer composition of claim 8 applied to seeds as a coating.

10. The biofertilizer composition of claim 4, wherein said A. panicicolaand said microorganism of the genus Barrenia are encapsulated in alginate beads.

11. The composition of claim 1, further comprising at least one of a gel formulation, agar, vermiculite, a sun protectant, rock phosphate, and a polysaccharide solution.

12. A biofertilizer composition comprising an effective amount of A. panicicola, at least one agent or microorganism for promoting plant growth and resistance to abiotic stresses, and 1% w/v of a polysaccharide selected from the group consisting of guar gum, gelan gum, pectin, carboxymetil cellulose, agar, and xanthan gum.

13. The composition of claim 12, wherein said at least one microorganism is a Burkholderia species.

14. The composition of claim 12, wherein said at least one microorganism is a fungus of the genus Barrenia.

15. The composition of claim 14, wherein the fungus is Barrenia panicia.

16. A biofertilizer composition comprising an effective amount of A. panicicola and at least one agent or microorganism for promoting plant growth and resistance to abiotic stresses, wherein the composition is applied as a seed coating and improves seed germination.

17. The composition of claim 16, wherein said at least one microorganism is a Burkholderia species.

18. The composition of claim 16, wherein said at least one microorganism is a fungus of the genus Barrenia.

19. The composition of claim 18, wherein the fungus is Barrenia panicia.

20. A method for enhancing overall plant growth and resistance to adverse abiotic conditions comprising contacting a plant or seed therefrom with the composition of claim 12.

21. The method of claim 20, wherein said composition contains bacteria selected from the Burkholderia genus.

22. The method of claim 20, wherein the crop plants are dicotyledonous plants or monocotyledonous plants.

23. The method of claim 22, wherein said plant is an edible plant selected from lettuce, corn, rice, soybeans, potatoes, barley, wheat, and carrots.

24. The method of claim 20 wherein said plant is a turfgrass plant selected from a Ryegrass, Kentucky Bluegrass, Tall Fescue, Bermuda, St. Augustine or Zoysia plant or any other turfgrass plant.

25. The method of claim 20, wherein said composition contains fungi selected from the Barrenia genus.

26. The method of claim 25, wherein the fungi is Barrenia panicia.

27. The method of claim 25, wherein said composition contains bacteria selected from the Burkholderia genus.