ABSTRACT
Mutation breeding in crop plants is an effective approach in improvement of crop having narrow
genetic base such as soybean. The main objective of the present study is to determine the effect of
different doses of gamma irradiation on different morpho-agronomic characteristics. Many physical
mutagens have been employed for obtaining useful mutants in various crop species. The role of
mutation breeding increases the genetic variability for the desired traits in various crop plants.
Soybean (Glycine max (L.) Mrr.) var. Co1. Was treated with physical mutagens like Gamma rays. For
inducing mutation of Soybean treated with various concentrations of gamma rays 10, 20, 30, 40, 50,
60, 70, 80, 90, and 100 KR. Agronomic traits and morpho metric characters such as germination
percentage, days of first flower, root length, shoot length, seedling survival, number of fruits per plant,
fruit length, seed yield per plant, fresh weight per plant, dry weight per plant and 100 seed weight. All
parameters were studied in M1, M2, M3 and M4 generations. The results of the present study re- vealed
that the increasing level of gamma rays treatment with decreased significantly most of agronomic and
morphological traits evaluated in M1 populations. In M2, M3 and M4 populations with significant
increase of morphology and yield components in soybean. The yield parameters like plant height,
number of cluster per plant, number of seeds per plant and seed yield per plant were recorded the
moderated and high mean value in the 50 KR of gamma rays.
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