Genetic parameters studies on morphophysiological trait in M3 population rabi sorghum (Sorghum bicolor (L.) Moench)

Abstract

This study explores the generation of desirable variability in sorghum [Sorghum bicolor (L.) Moench] using electron beam irradiation to enhance seed yield and its component traits. Titled “Genetic Variability and Correlation Studies for Morphophysiological Traits in M3 Generation of Mutagenized Population of Rabi Sorghum,” the research focuses on estimating genetic variability, heritability, correlation, and path analysis. Parental material TSG-98 (Muguthi) was subjected to irradiation at doses of 100 Gy, 200 Gy, 300 Gy, 400 Gy, and 500 Gy. The resultant M3 generation, comprising 60 mutants, was evaluated alongside controls during Rabi 2023-24. Fourteen traits, including days to flowering, plant height, and yield components, were assessed. Significant genetic variability was identified, with irradiated treatments outperforming controls in multiple traits. High heritability and moderate genetic advance were observed for grain yield-related traits. Correlation analysis revealed positive associations between grain yield and traits such as plant height and panicle length. Path analysis indicated that several traits directly contributed to grain yield at both genotypic and phenotypic levels.