‘ADI 9107’ is a short triploid banana plant belonging to the Cavendish group Musa acuminata (AAA). The ‘ADI 9107’ variety is a mutant of the earlier cultivar named ‘ADI’ (U.S. Plant Pat. No. 20,645), which was a selection of ‘Zelig’ originating in the Western Galilee, Israel. The ‘Zelig’ selection is known as a very unstable selection especially when propagated by tissue culture. The height of the ‘Zelig’ averages 3.5 meters. In contrast to ‘Zelig’ the original ‘ADI’ has a very short stature characteristic (2.15 meters). Despite the high productivity and low stature of the original ‘ADI’, the variety was not widely accepted in the Caribbean and Central and South America, mainly due to the high incidence of deformation of the upper hand when grown in tropical areas. In some cases, the top two hands are deformed. Consequently, the inventor had to modify the original ‘ADI’ (Khayat E. U.S. Plant Pat. No. 20,345) to make it more acceptable for the environmental conditions of the Caribbean and Central America. This was achieved via in vitro mutagenesis that induces transcriptional activation of retro-transposable elements. In an earlier report (Khayat and Ortiz, 2011) we have demonstrated that de-methylation of DNA activates retro-transposable elements.
An extensive process of tissue culture combined with inclusion of the de-methylation compound 5-Aza-2′-deoxycytidine (AZA) created a large and diverse population of mutants including the ‘ADI 9107’. The retro-transposing element expression was used as a marker in the selection process. The ‘ADI 9107’ was selected on the basis of its short plant stature, high bunch weight, perfect orientation of the upper hands (no visible deformation in the upper hands of the bunch), quick cycling and a high index of productivity.
‘ADI 9107’ was created using the tissue culture technology as specified below.
Banana and plantains (Musa spp.) comprise major food sources for more than 400 million people worldwide (i). Of the huge volume of fruit production approximately 15% is exported to remote markets. Most banana and plantains are inter or intra hybrids between two species namely Musa acuminata (A genome) and Musa balbisiana (B genome). By far, the most important export variety is Cavendish (a triploid AAA). In the 1950's, this variety replaced ‘Gros Michel’ (not patented) which was almost wiped out due to attacks from a new race of the fungal disease, Fusarium Wilt Race 1. Being resistant to the disease combined with wide consumer acceptance in export markets made ‘Cavendish’ irreplaceable. However, due to double sterility and the triploid nature of ‘Cavendish’, breeders have very limited tools to improve the germplasm of this variety. Consequently, ‘Cavendish’ bananas suffer from a variety of pests and diseases. In addition, the plants are wind sensitive, have a relatively high stature, short shelf life of the fruit and low tolerance to environmental stresses like lack of or excess water, low mineral nutrition, soil compaction and salinity. Due to the inability of ‘Cavendish’ to cross hybridize there are very limited sources of variability.
Originally ‘ADI’ (Musa acuminata AAA Cavendish) was a mutant derived from ‘Zelig’, which is a selection of the cultivar ‘Grand Naine’. All ‘ADI’ cultivars were selected in the Western Galilee, Israel. The ADI mutant has many beneficial agro-technical traits but the most noticeable are low stature and large fruit bunch. The cv. gained some popularity in Martinique and Guadeloupe owing to the ability of growers to spray the canopy against black sigatoka disease from the ground in light of the ban of use air sprays. However, local environmental conditions in the Caribbean Islands and Central America required a modulation of the cv., especially in relation to its extreme low stature and deformation of the upper hand of the fruit bunch. In the present development we describe a new generation of ‘ADI’ that was selected under the specific environmental conditions of Martinique. The method we have used entails a concomitant evaluation of a mutated population of ‘ADI’ in two locations, Martinique and Israel. The selected clones were compared to various Cavendish cvs. In many parameters, the new ‘ADI’ (9107) was superior to competing clones and showed no deformation under the conditions of both locations, in Israel and in Martinique.
In this work we have used a new method of mutagenesis that entails de-methylation of DNA in the in-vitro meristematic culture. This method was proven effective in activation of retro-transposable elements that induce stable mutations in plants (Paczkowski, 2015). Cytosine methylation has been associated with genetic inactivity and a heterochromatic state in many higher eukaryotes, including plants where de novo methylation was first detected during the inactivation of DNA transposable elements of the mutation compound (Bennetzen J. L. et al, 1997). This cytosine methylation has been associated with both transcriptional inactivity and a higher rate of C to T transitions, giving rise to enhanced transcriptional and mutational silencing. The first evidence on the role of DNA methylation in the regulation of retro transposition comes from a study on Ttol by Hirochika et al., (2000). It was observed that after the initial active retro-transposition in the Arabidopsis genome, Ttol became silent. In this breeding program we have used the de-methylation compound 5-Aza-2′-deoxycytidine in order to induce mutagenesis in the ‘ADI’ genome.
This new selection of dessert banana plant was asexually reproduced by corms in tissue culture by the inventor in Rosh Hanikra, Israel. ‘ADI 9107’ has been proven stable in the field for at least three consecutive generations.
It seems from
The data in
This measurement reflects quality and yield of the plants. However, given the Israeli winters we had to assign all the cvs. and the two clones the following timing data, which will be inaccurate for Martinique but will reflect the differences. By far the best performing clone is 9107 as the time to flowering combined with bunch weight exceeds the other ‘ADI’ cvs. ‘JAFFA’ exhibited a higher bunch weight but flowering cycle of ‘JAFFA’ is significantly longer.
An apparent distinguishing morphological feature between ‘ADI 9107’ and its originator ‘ADI’ is a malformation of the fruit bunch that was prevalent in the precursor cultivar ‘ADI’ that was improved to be a normal fruit arrangement phenotype in the mutant 9107,
In the present invention we describe a distinct elite ‘Cavendish’ selection, ‘ADI 9107’, an improved bunch structure despite having a dwarf-like stature, it has a higher fruit yield, longer and heavier fruit (“fingers”) and early flowering similar to the originator cultivar ‘ADI’ but superior to the other Cavendish cultivars.
Detailed botanical description of the new and distinct selection ‘ADI 9107’, which includes its general appearance, pseudostem and suckers, petiole, midrib, leaf, inflorescence and male bud, flower bract, male flower, and fruit. This description is based on observations of specimens grown in the Western Galilee, Israel, 14 months after planting. The plantation is at 30 m above sea level, approximately 1200 m East of the Mediterranean Sea, adjacent to the town of Shlomi. The description is based on an observation of approximately 50 plants grown in a commercial plantation. Data was collected in April and May 2017. The descriptors presented herein are in accordance with and include all of the 117 international standards found in “Descriptors for Banana (Musa spp.)” elaborated by CIRAD/INIBAP/IPGRI. The color terminology is in accordance with The U.K.'s Royal Horticultural Society's Colour Chart, 2001. Ploidy: Triploid (AAA). Leaf habit: Drooping.
Table 1 reveals the number of the above ground suckers do not differ greatly between the different cultivars. Cultivar 9107 produced 5.6 suckers compared to 6.4 for 9001 and 6.1 for ‘ADI’. There are no significant differences in the diameter of the pseudostem for the 3 cultivars (9107, 9001, and ‘ADI’). The length of the petiole of 9107 is significantly greater than the other 2 cultivars and on the contrary the peduncle diameter of 9107 is shorter than both other cultivars. The length of the bunch is similar in all 3 cultivars, but the diameter of the bunch is greater in 9107 (37.8, 34.6, 33.8) respectively for 9107, 9001, and ‘ADI’. Finally, the total number of fruit per hand counting all marketable hands are 19 for 9107, 20 for 9001, and 19.2 for ‘ADI’. Therefore, we conclude that the higher weight in 9107 stems from the size of the fingers rather the number of fingers. This conclusion is supported by the fact that the diameter of the bunch is greater in 9107 compared to the other 2 cultivars.
All 3 cultivars show a drooping growth style compared to other Cavendish types. No pubescence was noticed in any of the 3 cultivars (9107, 9001, and ‘ADI’).
Number | Name | Date | Kind |
---|---|---|---|
PP20645 | Khayat | Jan 2010 | P3 |
20090222959 | Khayat | Sep 2009 | P1 |
Entry |
---|
Bennetzen J.L. and Kellogg E.A. (Sep. 1997). Do Plants Have a One-Way Ticket to Genomic Obesity?, in: The Plant Cell, American Society of Plant Botanists, Letters to the Editor, pp. 1509-1514. |
Khayat E. and Ortiz R. (2011). Genetics of important traits in Musa, in: Michael Pillay and Abdou Tenkouano (eds): “Banana breeding: constraints and progress”, CRC Press pp. 71-84. |
Citation: E. Khayat (2018). TR4 Resistant GAL, presented at the International Congress of Plant Pathology, proceedings of the Banana workshop, Jul. 29-Aug. 3, 2018. |
Paszkowski J. (Jan. 2015). Controlled activation of retrotransposition for plant breeding, ScienceDirect Current Opinion in Biotechnology 2015, 32:200-206. |
Hirochika H., Okamoto H., and Kakutani T. Silencing of Retrotranposons in Arabidopsis and Reactivation by the ddm1 Mutation, The Plant Cell, vol. 12, 357-368, Mar. 2000. |