Author(s):

Madhuri Pradhan and Amitava Paul

Abstract: The field experiment was conducted during post-kharif season, 2015 and pre-kharif season, 2016 at the Agricultural Farm of Palli Siksha Bhavana (Institute of Agriculture), Visva-Bharati, Sriniketan. Dry and homogeneous seeds of two varieties of sesame were irradiated with different doses of gamma rays viz. 250, 300, 350 and 400 Gy. Analysis of variance for different plants in M₁ generation and families in M₂ generation of each genotype of Rama and Tillotoma for different polygenic characters or parameters are carried out. The parameters investigated include days to flowering, days to 50% flowering, plant height, no. of branches per plant, no. of siliqua per plant, no. of seeds per siliqua, siliqua length, days to maturity, 1000 seed weight. In M₁ generation, mean sum of squares due to variety were, however, significant for only germination (%) and no. of siliqua per plant, while the dose × variety interaction effects were significant for germination (%), shoot length, days to 50% flowering, plant height, no. of seeds per capsule and days to maturity which indicated that varieties/genotypes responded differently to different doses of gamma rays for these characters. In M₂ generation, the mean sum of squares due to treatments were found to be significant for almost all the characters except number of primary branches per plant and 1000 seed weight in case of both Rama and Tillotoma, and for capsule length in Rama only. However, when analysis was done (considering families both from Rama and Tillotoma) in combination, were significant for all the characters except 1000 seed weight.

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