Bangaremma Wadeyar and ST Kajjidoni
Diplod cotton especially Gossypium herbeceum are poor seed cotton yielders and also have poor fiber properties while in parallel diploids have good buffering capacity towards the fluctuating environment. Hence an attempt has been made to enhance the yield levels in diploid cotton using gamma rays as an additional variability creating agent. Here a total of one hundred and ten progenies comprising of irradiated (F4M4 45), unirradiated (F4 52) and irradiated jayadhar (M4 13) were evaluated at Main Agricultural Research Station, UAS, Dharwad to obtain information on mean, variance, range, genetic variability, heritability and genetic advanced for thirteen traits. The mean, range and variance among progenies, F4M4 progenies exhibited relatively higher progeny mean performance and wider range of values for most the traits under study (seed cotton yield 60.89, 32-96 and 228.72). The high estimates of PCV and GCV were recorded for M4 generation for boll weight (20.82 and 20.29) and seed cotton yield (42.7 and 40.6) show simple irradiation helps to improve these traits whereas, F4M4 progenies recorded high PCV and GCV for seed index (11.2 and 10.29) indicating hybridization followed by irradiation has an additional advantage to improve this trait. The high heritability coupled with high genetic advance was noticed for seed cotton yield and yield components as well as fibre quality traits among progenies. When the assessment was made across the progenies for important traits to know how much percent has progressed to next generation the F4M4 contributed higher number of superior progenies for boll weight traits (10 progenies) and fibre length (7 progenies). The best performing progenies will be stabilizes over location and tested for their superiority with the existing variety.
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