Radiation induced variation in Phaseolus vulgaris L. for seed yield traits and biotic stress

Significant within line and between lines variation was induced for seed yield under 5kR, 10kR and 15kR doses of gamma-rays in M₂ of ‘Jawala’ and ‘HPR35’ varieties; and for biological yield, number of seeds and number of pods under 5kR and for seeds per pod under 10KR in M₂ of ‘Jawala’ variety. between lines variation was also observed for seed yield under 20kR in M2 of ‘Jawala’. Within line and between lines, variation was induced for seed yield under 10kR, and for plant height under 10kR and 15kR in M₃ of ‘Jawala’, However, within line variation was also observed for seed yield under 5kR, 10kR and and 15kR in M₃ of ‘Jawala’ whereas between lines, variation was induced for seed yield under 5kR and for biological yield under 5kR and under 15kR in M₃ of ‘HPR35’. However, within line variation was also observed for harvest index, seeds per pod, pod yield and pod length under 15KR and for seeds per pod and pod length under 5kR in M₃ of HPR 35, Mutants 128 (10kR) of ‘Jawala’ and 232-1 (5kR), 236-2 and 238-1 (10kR) and 208 (15kR) of ‘HPR 35’ were found moderately resistant against anthracnose (Colletotrichum lindemuthiarium) in M₃ when tested under laboratory conditions. Mutants 32-1, 236-2, 238-1 and 208 (all of ‘HPR 35’) also had higher seed yields than the parent ‘HPR 35’.