National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Hybridization was carried out between highly resistant genotype Meha and four susceptible genotypes viz., Pusa Vishal, GJM-1006, GM-4 and GJM-1008 to deduce genetics of Mungbean Yellow Mosaic Virus (MYMV) resistance in mungbean. Parents, F1s, F2s and F3 progenies were evaluated for their response to MYMV infection utilizing highly susceptible variety GM-4 as an infector row keeping one row of GM-4 after every two rows of parents, F1s, F2s and F3 progenies. No insecticides were sprayed to build up white fly vector population. Segregation pattern of resistance and susceptibility in F2 generation indicated duplicate epistasis (15: 1) which was confirmed by non-significant χ2 test. The proposed genotypes for Meha, susceptible male parents and hybrids are R1R1R2R2, r1r1r2r2 and R1r1R2r2, respectively. Ten resistant F2 plants were selfed to further confirm digenic duplicate epistatic nature of mosaic resistance. Out of ten F3 progenies, seven progenies exhibited 15: 1, while three manifested 3: 1 segregation pattern of resistant and susceptible plants in support to duplicate epistasis. The proposed genotype of F2 individuals showing 15: 1 segregation pattern in F3 progenies is R1r1R2r2. While, F3 progenies indicating 3: 1 ratio predicted F2 individual’s genotype either as R1r1r2r2 or r1r1R2r2 from which they are derived. The results are also in accordance with the lineage of mosaic resistance in Meha from blackgram. The role of duplicate epistasis observed in present study will pave the ways to transfer mosaic resistance in high yielding susceptible cultivars as well as for molecular breeding of mungbean against MYMV infection.
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