Effect of mutagens on quantitative traits in M2 generation in sesame (Sesamum indicum L.)

Sheeba, A.; Ibrahim, S.M.; Yogameenakshi, P.; Babu, S.

Indian Journal of Genetics and Plant Breeding 63(2): 173-174


ISSN/ISBN: 0019-5200
Accession: 003731415

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The effects of gamma radiation and ethyl methanesulfonate (EMS) on the quantitative traits of sesame cultivars SVPR 1 and Co 1 were studied in Madurai, Tamil Nadu, India in 2001. The dry seeds of both cultivars were subjected to gamma irradiation at 30, 40, 50, 60 or 70 kR and EMS at 0.8, 1.0, 1.2, 1.4 or 1.6%. Polygenic variability for plant height, number of branches per plant, number of capsules per plant, capsule length, number of seeds per capsule, 1000-seed weight, oil content and yield per plant was evaluated. In SVPR 1, maximum heritability was recorded for number of capsules per plant at 40 kR (99.4%) and for yield per plant at 1.0% EMS (99.9%). In Co 1, 60 kR gamma radiation (99.9%) and 1.4% EMS (99.8%) resulted in maximum heritability in number of branches per plant and capsule length, respectively. In irradiated progenies, genetic advance (GA) as percentage of the mean was highest at 30 kR for 1000-seed weight in SVPR 1 (19.53%) and for capsule length in Co 1 (22.62%). In EMS-treated progenies, 1.4% EMS in SVPR 1 (15.77%) and 1.6% EMS in Co 1 (11.59%) resulted in the greatest GA in yield per plant and capsule length, respectively. High heritability (96.7%) and high GA (22.62%) were recorded for capsule length in Co 1 at 30 kR. The results suggest that the yield can be improved by selection based on capsule length.