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Gamma Ray Induced Polygenic Variability Studies in M1 and M2 Generations of Indian Mustard (Brassica juncea L. Czern and Coss)
Abstract
The experiment was carried out to study induced variability in three Indian mustard genotypes (i.e. CAULC-1, CAULC-2 and PM-25) using five gamma ray doses. Observations were recorded for 14 characters to test the biological effects of gamma ray in M1 generation. Out of the 14 characters studied, the characters seedling survival and pollen fertility were, in general, reduced with the increase gamma ray doses. While random effects of gamma rays were observed for the characters seed yield and its ancillary traits, viz. days to 50% flowering, days to 80% maturity, plant height, no. of primary branches/plant, siliqua length, total no. of siliqua/plant, no. of seeds/siliqua and 1000 seeds weight. Induced variability in M2 generation were observed in the characters total no. of siliqua/plant, seedling height, 1000 seeds weight and no. of primary branches/plant. The high heritability along with high genetic advance was estimated from the characters total number of siliqua/plant and number of primary branches/plant. The medium low heritability with high genetic advance was observed for days to 50% flowering, days to 80% maturity and plant height at maturity. The presence of medium or high heritability and high genetic advance of the above characters indicated the importance of additive gene action. Changes in mean values which were significantly higher or lower over parents for the characters total no. of siliqua/plant, plant height at maturity and no. of primary branches/plant, further, supported the effective selection in later generations based on these characters.
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References
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DOI: https://doi.org/10.37628/ijpb.v8i1.739
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