Patent Application
20150271977
The Latin name of the novel plant variety disclosed herein is Miscanthus sinensis.
The inventive variety of Miscanthus sinensis disclosed herein has been given the varietal denomination ‘NCMS1.’
The present invention comprises a new and distinct cultivar of miscanthus, botanically known as Miscanthus sinensis, and hereinafter referred to by the cultivar name ‘NCMS1’. This new miscanthus was developed and selected at North Carolina State University, Mills River, N.C. ‘NCMS1’ is a triploid produced from a controlled pollination. The female parent was an artificially induced tetraploid hybrid between Miscanthus sinensis ‘Strictus’ (not patented) and Miscanthus sinenesis ‘Variegatus’ (not patented). The male parent was a diploid Miscanthus sinensis ‘Zebrinus’ (not patented).
‘NCMS1’ was first established in vitro in 2007 through embryo rescue techniques and has been asexually reproduced through micropropagation and division at the North Carolina State University, Mountain Horticultural Crops Research Station, Mills River, N.C. over a 7 year period. ‘NCMS1’ has been evaluated in the field and containers for 6 years. ‘NCMS1’ can be propagated through micropropagation or division and has been found to retain its distinctive characteristics through successive asexual propagations.
The following traits have been repeatedly observed and are distinguishing characteristics of this new cultivar when grown under normal horticultural practices at North Carolina State University, Mountain Horticultural Crops Research Station, Mills River, N.C.
1. ‘NCMS1’ is a triploid Miscanthus sinensis with a 2C genome size of approximately 5.9 pg.
2. ‘NCMS1’ is highly infertile and has greatly reduced (99.3%) overall fertility (% seed set×% germination/100) compared to diploid Miscanthus sinenesis ‘Zebrinus’.
3. ‘NCMS1’ has rigid upright culms and cascading leaf blades resulting in an attractive form with showy inflorescences.
The new miscanthus plant, ‘NCMS1,’ is illustrated by the accompanying photograph which shows the plant's form, foliage and inflorescences. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the colors of the new Miscanthus sinensis. The photographs were taken in Mills River, N.C.
The following is a detailed description of the botanical characteristics of the new and distinct variety of Miscanthus sinensis plant known by the denomination ‘NCMS1’. The detailed description was taken on four-year old plants grown under landscape conditions in Mills River, N.C. in the summer and fall of 2012. All colors cited herein refer to The Royal Horticultural Society Colour Chart (The Royal Horticultural Society (R.H.S.), London, 2001 Edition). Where specific dimensions, sizes, colors, and other characteristics are given, it is to be understood that such characteristics are approximations or averages set forth as accurately as practicable.
Botanical name: Miscanthus sinensis.
Common name: maiden grass.
Variety name: ‘NCMS1’.
Parentage:
Female parent: Tetraploid hybrid (Accession, H2008-024-001) of Miscanthus sinensis ‘Strictus’ ×Miscanthus sinensis ‘Variegatus’.
Male parent: Miscanthus sinensis ‘Zebrinus’ (Accession, 2004-200).
Blooming period: Late August through early September in Mills River, N.C.
Plant habit: Clump forming ornamental grass, rigid upright culms and cascading leaf blades, vase-shaped form.
Height and spread: Reaches a height, including inflorescences, of 2.4-2.8 M (foliage approximately 1.8 M high), spread at base approximately 0.9 M, foliage cascading to approximately 0.9 M in diameter in 3 years.
Cold hardiness: At least USDA zone 6; testing has not been completed in colder zones.
Culture: Optimal growth in fertile moist soil in full sun.
Disease and pests: No significant disease or insect pests have been observed.
Root description: Fibrous.
Propagation: Propagated through culm division and micropropagation.
General: Cylindrical, smooth, partially enclosed by leaf sheaths.
Culm aspect: Erect and rigid, all extending from ground, non-cascading.
Culm color: 146 B.
Culm size: Up to 4.0 to 7.5 mm wide, 1.2-1.8 M high in mature plants.
Culm surface: Glabrous.
Internode length: 11.5 to 24 cm.
Ligule: Membraneous about 3-4 mm in width.
Foliage description:
Leaf shape: Linear.
Leaf apex: Acute.
General description: Panicle terminating from each culm in late-August to early September, composed of up to 36 cascading racemes at anthesis.
Lasting of the infloresence: Panicles are persistent throughout winter.
Fragrance: None.
Panicle size: Average size 31 cm in length and 4 to 6 cm in width.
Panicle color: Emerges 162 A and turns a beige during dormancy 161 D.
Raceme (spike) description: Racemes up to 22 cm long, up to 36 Racemes (spikes) per panicle.
Spikelet description: Equal glumes surround a shorter hyaline lemma, smaller hyaline palae, awn extending 6 mm beyond spikelet, approximately 60 spikelets per raceme, arranged in two pairs unequally pedillate.
Androceum: Anthers; 3, 2 mm in length and <0.5 mm in width, 165 A in color, attached to spikelet by a thin filament approximately 1 mm. Pollen present.
Gynoecium: Pistil 1; 2 plumose stigmas, 2 mm in length and <0.5 mm in width, N186A in color short filamentous styles. Ovary; 1 locule, superior.
In a replicated study (See, Rounsaville et al., 2011), ‘NCMS1’ (H2008-091-004) had greatly reduced female fertility compared with the diploid control, ‘Zebrinus’ (Table 1).
Furthermore, the limited progeny derived from open-pollinated ‘NCMS1’ plants were aneuploids with 2C genome sizes intermediate between diploids and triploids. As such, ‘NCMS1’ provides an attractive and highly infertile alternative to diploid cultivars where reseeding and naturalization is a concern.
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Rounsaville, T. J., D. H. Touchell, and T. G. Ranney. 2011. Fertility and reproductive pathways in diploid and triploid Miscanthus sinensis. Hortscience 46(10):1353-1357.
