Genetic Variability and Path Coefficient Analysis for Yield and Yield Related Traits in Commons Bean (Phaseolus vulgaris L.) Accessions at Haramaya University, East Hararge, Ethiopia.

Genetic Variability and Path Coefficient Analysis for Yield and Yield Related Traits in Commons Bean (Phaseolus vulgaris L.) Accessions at Haramaya University, East Hararge, Ethiopia.

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Title: Genetic Variability and Path Coefficient Analysis for Yield and Yield Related Traits in Commons Bean (Phaseolus vulgaris L.) Accessions at Haramaya University, East Hararge, Ethiopia.
Author: Berecha, Gutu Regasa; Dr. Yohannes, Petros
Abstract: Studying genetic variability in crop plants is important for improving the crops and enhancing production. Therefore, an experiment was conducted at Haramaya University’s Research farm in main campus at Rare research site to assess the genetic variability and association among characters in twenty three common bean accessions and two varieties common bean and their contribution to yield. The experiment was laid out as simple lattice design with twenty five common bean genotypes planted in two replication. Data were collected on 13 quantitative characters including plant height, number of node on the main stem, internode length, number of pods per plant, pod length, number of seeds per pod, days to 50% flowering, days to 90% maturity, seed yield per plant, seed yield per plots, biological yield, harvest index and 100%seed weighted. High genotypic coefficients of variation (GCV) were observed for number of seeds per pod, number of nodes on the main stem and internode length. Heritability estimates ranged from 5.0% for number of pods per plant to 91.4% for harvest index. Genetic advance as percent of mean ranged from 1.26% for biological yield to 23.7% for number of seeds per pod. At phenotypic level, number of pods per plant exhibited positive and highly significant (p≤0.01) correlation with seed yield per plot. At the genotypic level, number of node on the main stem, seed yield per plot had positive and highly significant (p≤0.01) correlation with number of pods per plant. The maximum positive phenotypic direct effects on seed yield were observed in number of pods per plant and days to 50% flowering with the values 0.605 and 0.489 respectively. In conclusion, the result of this study demonstrated that there is sufficient genetic variability among the common bean genotypes and a number of characters were found to have high broad sense heritability, which could be used to improve the yield and other agronomic characters of the crops through selection or breeding. Inter-cluster distance (D2) ranged from 34.09between cluster IV and I to 415.39 between clusters IV and II. Genotypes with maximum inter-cluster distances are genetically more divergent.
Description: 76p.
URI: http://hdl.handle.net/123456789/3146
Date: 2015-06


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