Rajput, S. S.YADAV, MAHIPAL2024-01-052024-01-052022https://krishikosh.egranth.ac.in/handle/1/5810205809The present investigation was carried out in a set of 72 M4 mutant lines of blackgram. The progenies employed in the present investigation were derived from parents PU 1 and CO 6 with three doses of physical mutagen (gamma rays) viz., 200 Gy, 400 Gy and 600 Gy. Mutants were evaluated in augmented randomized block design with four blocks during kharif, 2021. The analysis of variance showed significant difference among the mutants for all of the traits studied viz., days to 50% flowering, days to maturity, plant height, branches per plant, clusters per plant, pods per cluster, pods per plant, pod length, seeds per pod, 100-seed weight, seed yield per plant and protein content, it indicates existence of significant variability among the mutants. The highest PCV and GCV were observed for seed yield per plant, pods per plant, seeds per pod and plant height. All the characters showed high heritability. Similarly, out of twelve, eight characters showed high genetic advance as percent of mean, while two characters namely pod length and protein content (%) showed moderately and two characters viz., days to 50% flowering and days to maturity revealed low genetic advance as percent of mean. High genetic advance as percent of mean coupled with high heritability were observed for plant height, branches per plant, clusters per plant, pods per plant, seeds per pod, 100-seed weight and seed yield per plant. Selection based on these characters will be rewarding for improvement of the mutants.The character association analysis revealed that pods per plant, branches per plant, seeds per pod, pods per cluster, plant height, pod length, clusters per plant and days to 50% flowering were observed positive and significant with seed yield per plant, whileit was positive and non-significant with days to maturity and protein content. The path analysis revealed that branches per plant, pods per plant, seeds per pod and plant height were effective for the selection of high yielding mutants as they exhibited high positive direct effect along with significant positive correlation with seed yield per plant. On the basis of seed yield per plant, five mutants i.e., T6-70, T1-6, T1-1, T6-72 and T2-14 was found promising over all the checks including parents. Therefore, these high yielding mutant lines identified from the mutant progenies of PU 1 (200Gy and 400Gy) and CO 6 (600Gy) could be used directly in urdbean breeding programme for generating elite mutant cultivars or through hybridization for obtaining desirable segregants in the subsequent generations.EnglishThesis