Correlation path analysis and genetic diversity for yield and yield components in induced mutants of rabi sorghum (sorghum bicolar L. moench)
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Date
2020-09-30
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
The present investigation entitled “Correlation, Path Analysis and Genetic Diversity for Yield and Yield Components in Induced Mutants of Rabi Sorghum (Sorghum bicolar L. Moench)” was carried out at Department of Agricultural Botany, V.N.M.K.V., Parbhani during rabi 2019-20. 57 sorghum mutant lines along with six checks i.e. P.Moti, CSV-22R, P.S. Moti, PKV Kranti, CSV-29R and M-35-1. These mutant lines were grown in Randomized Block Design with 2 replications to study genetic variability and associations among grain yield and yield component characters, to study direct and indirect contribution of different component characters on grain yield and to assess genetics diversity among various mutant lines.
Analysis of variance showed significant differences among the genotypes for all the traits indicated wide range of variability among genotypes for yield and yield contributing characters and ample scope of improvement by selection. Among the mutant lines PMME-1-17, PMME-1-25, PMME-1-31 and PMME-1-40 recorded least days to flower while, genotype PMME-1-17 and PMME-1-40 were found early to mature. Highest panicle length was observed in the genotype PMME-5-63 and PMME-1-40. The genotype PMMG-5-1 recorded higher number of primaries per panicle. While, the genotype PMMG-5-1 and PMME-5-38 recorded highest 100-seed weight. The grain yield per plant was more in PMMG-5-16 and highest fodder yield per plant was observed in PMME-5-81. The genotype PMME-5-33 recorded highest Fe and Zn content. Maximum protein content was observed in PMME-5-38. The genotypes PMMG-9-5, PMME-1-40, PMME-5-63 and PMMG-6-27 recorded highest scale for plant height, number of primaries per panicle, panicle length, weight, 100-seed weight, grain yield per plant and fodder yield per plant respectively.
High estimates of genotypic and phenotypic coefficient of variation were recorded for fodder yield per plant, plant height, Zn content, grain yield per plant, panicle weight. The characters fodder yield per plant, panicle weight, days to physiological maturity, Zn content, grain yield per plant, plant height and number of primaries per panicle expressed high estimate of heritability accompanied with moderate to high genetic advance. In the present investigation, significant and positive correlation of grain yield were observed with characters viz., panicle length, number of primaries per panicle, panicle width, panicle weight, 100 seed weight and Fe content at both genotypic and phenotypic level. Whereas association was negative and significant desirable direction non of the found in all characters. The traits panicle length, number of primaries per panicle, panicle width, panicle weight, 100 seed weight and Fe content recorded positive direct effect on grain yield per plant at genotypic and phenotypic level.
Based on D2 statistics and Tocher’s method, 57 mutant lines accessions including 6 checks were grouped into thirteen clusers with variable number of entries in each cluster revealing the presence of considerable amount of genetic diversity in the material. The inter cluster distance was maximum for cluster XIII and II (D2=401.20) indicating that the selection of genotypes from these clusters for hybridization programme would lead to maximum divergence.
Cluster mean indicate the variation for the quantitative trait among the clusters. Considering major yield contributing traits along with earliness to flowering and maturity cluster VIII and XII shown high mean hence genotypes from these clusters should be used for further hybridization and isolating transgressive segregants.