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Authors: Laxmanbhai, Mayani Rameshkumar
Advisor: Desai, N. C.
Title: Genetic Variability, Correlation, Path and D2 Analysis in blackgram [Vigna Mungo (L.) Hepper]
Publisher: Agricultural Botany Department, N. M. College of Agriculture Gujarat Agricultural University
Language: en
Type: Thesis
Pages: 108
Agrotags: null
Keywords: Botany
Abstract: Genetic variability, correlation, path analysis and genetic divergence were studied in a set of 43 genotypes of blackgram [Vigna mungo (L .) Hepper] grown in a randomized block design with three replications at the Pulse Research Station, Gujarat Agricultural University, Navsari during summer. Analysis of variance revealed significant genotypic differences for all the twelve characters under study. A wide range of variation was apparent for all the characters. The genotypic co-efficient of variation was the highest for number of branches per plant followed by grain yield per plant and number of clusters per plant. Heritability estimates were high for number of branches per plant, days to maturity, grain yield per plant, protein content and harvest index. The expected genetic advance as per cent of mean was high for number of branches per plant, grain yield per plant, number of clusters per plant and number of pods per plant. Two ---- characters, number of branches per plant and grain yield per plant had high heritability coupled with high genetic advance. So phenotypic selection for such trait would be effective. Correlation analysis revealed that grain yield per plant was found to be highly significant and positively correlated with number of pods per plant, number of clusters per plant, harvest index and days to 50 per cent flowering at genotypic and phenotypic level. These yield contributing characters also possessed highly significant and positive association among themselves. Path co-efficient analysis indicated the highest direct effect of number of pods per plant followed by harvest index and pod length. Plant height, number of branches per plant, protein content, days to 50 per cent flowering had negative direct effect while days to maturity had lower positive value. Based on these findings, it can be suggested that for improving grain yield in blackgram, more emphasis should be given to number of pods per plant, harvest index and pod length. The genetic diversity was assessed using Mahalanobis' s D2 statistic wherein 43 genotypes were grouped in nine clusters. The clustering pattern of the genotypes was independent of their geographical distribution. The superior genotypes for breeding programme can also be selected on the basis of cluster means and inter cluster distances. Therefore, for creating wide spectrum of variability intercrossing among the genotypes of cluster IX and IV and cluster I (particularly better performing genotypes viz., NU-2, NU-II, SKNU-9717, NU-6, SKNU- 8404 and TU-2000-4)
Subject: Botany
Theme: M.Sc. Thesis
These Type: M.Sc
Issue Date: 2003-10
Appears in Collections:Master Degree Theses

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