Loading...
Please wait, while we are loading the content...
GENETIC DIVERGENCE FOR QUALITY, YIELD AND YIELD COMPONENTS IN YARDLONG BEAN (Vigna unguiculata (L.) Walp. ssp. sesquipedalis Verdc.)
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | Reddy, K. Ravinder |
| Researcher | Rambabu, Eslavath |
| Abstract | A set of forty one genotypes of Yardlong bean (Vigna unguiculata (L.) Walp. ssp. sesquipedalis Verdc.) was evaluated in a Completely Randomized Block Design with three replications at student research farm, College of Horticulture, Dr.YSRHU, Rajendranagar during kharif, 2013 with an objective to study genetic variability, genetic divergence, character association and path coefficient analysis. The Analysis of Variance revealed significant differences among the genotypes for all the nineteen characters under study suggesting considerable amount of variability exists among the genotypes. The phenotypic coefficient of variation was slightly higher in magnitude than genotypic coefficient of variation for all the characters indicating that all characters had interacted with influence of environment to some degree. High PCV and GCV were recorded for number of pods per plant, pod length, pod ascorbic acid content and pod yield per plant suggesting the existence of wider genetic variability for the traits in the genotypes under study. High heritability coupled with high genetic advance as per cent of mean was observed in case of plant height, terminal leaf breadth, length of cluster stalk, number of clusters per plant, number of pods per plant, pod length, pod girth, pod ascorbic acid content and pod yield per plant indicating the preponderance of additive gene action making selection effective. Number of primary branches per plant, terminal leaf length, length of harvesting time, number of pods per cluster, seed number per pod and seed protein content showed high or medium heritability and moderate genetic advance as per cent of mean revealing in heritability of these characters the presence of both additive and non additive gene action. The correlation study for nineteen characters of Yardlong bean indicated that all the traits except terminal leaf breadth, days to first flowering, days to 50 per cent flowering, days to 95 per cent pod maturity, pod ascorbic acid content and seed protein content had significant positive association with pod yield per plant at both genotypic and phenotypic levels. Path coefficient analysis study revealed that length of cluster stalk and pod girth exerted high and positive direct effect on pod yield per plant and these traits recorded significant positive correlation with pod yield per plant signifying the importance of these traits in selection programme for crop improvement. Genetic divergence was assessed among 41 genotypes of Yardlong bean for 19 characters using Mahalanobis’ D2 statistics. The genotypes were grouped into seven clusters. Pod length contributed maximum towards divergence followed pod ascorbic acid content, pod girth and 100 seed weight. Highest inter cluster distance was observed between cluster V and VII followed by cluster VI and VII. Highest cluster mean values were observed for most of the traits with the genotypes present in cluster VI. Based on the D2 statistics genetic distances, cluster men values and clustering pattern the genotypes IC-582859, NSJ-362, IC-582850, IC-582872, IC-582851 and IC-582829 from III, V, and VI clusters could be used as best parents in crop improvement programme to produce desirable segregants for yield and yield traits in Yardlong bean. The present investigation revealed that the genotypes IC-582859 and NSJ-362, IC-582850 and IC-582872 were found superior on the basis of the characters having high heritability, high genetic advance as per cent of mean and strong association and high direct effect on pod yield. Hence for these characters due weightage should be given in selection programme and as parental sources should be used in future breeding programmes of Yardlong bean. |
| File Size | 4227756 |
| File Format | |
| Language | English |
| Publisher | Dr. Y.S.R. HORTICULTURAL UNIVERSITY |
| Access Restriction | Open |
| Subject Keyword | Genotypes Phenotypic Coefficient of Variation Pcv and Gcv Correlation Study D2 Statistics Genetic Distances |
| Content Type | Text |
| Resource Type | Thesis |
