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GENETIC VARIABILITY, HERITABILITY, CORRELATION AND PATH COEFFICIENT ANALYSIS IN DOLICHOS BEAN [Lablab purpureus (L.) Sweet] GENOTYPES

KrishiKosh

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Title GENETIC VARIABILITY, HERITABILITY, CORRELATION AND PATH COEFFICIENT ANALYSIS IN DOLICHOS BEAN [Lablab purpureus (L.) Sweet] GENOTYPES
 
Creator AJAY VERMA
 
Contributor Dr.K. UMA JYOTHI
 
Subject genetic variability ,genetic divergence,correlation and path analysis,genotypes
 
Description A field experiment was conducted to estimate the genetic variability and genetic divergence in dolichos bean and to carry out yield component analysis through correlation and path analysis. Twelve genotypes including two checks were sown in a randomized block design with three replications, during Kharif 2012 at Horticultural College and Research Institute, Venkataramannagudem. The objective of the experiment was to identify divergent genotypes to be used as donor parents in hybridization programmes.
The analysis of variance revealed significant differences between genotypes indicating presence of sufficient amount of variability in all the characters studied. Wide range of variability was observed for plant height, days to first flowering, days to 50% flowering, number of inflorescences per plant, number of pods per inflorescence, pod yield per plant, number of pods per plant and days to last pod harvest indicating the scope for selection of suitable initial breeding material for further improvement.
On the basis of the mean performance of the genotypes among traits studied, the following were identified as promising lines for further crop improvement in dolichos bean viz., GL-243, Culture-47 and GL-671. Among all the genotypes studied, genotypes GL-243 recorded the highest pod yield per plant and found suitable to the local agro-climatic conditions.
GA as per cent of mean, GCV and PCV values were on par with one another for most of the characters which indicated that the influence of the environment on the trait (s) was very negligible. The values observed were not confounding with the environment. It is a true reflection of the homeostasis effect or buffer reaction of the gene. Thus, the true reflection of the trait is exhibited.
Among the characters studied, high PCV and GCV were observed for characters like plant height (cm), number of secondary branches per plant, number of inflorescences per plant, number of pods per inflorescence, number of pods per plant, hundred seed weight (g) and pod yield per plant (g) indicating high variability available in the germplasm for these characters for further improvement.
High heritability coupled with high genetic advance as per cent of mean was observed for characters viz., plant height (cm), number of secondary branches per plant, days to first flowering, days to 50% flowering, number of inflorescences per plant, number of pods per inflorescence, number of pods per plant, hundred seed weight (g) and pod yield per plant (g) indicating that these characters were least influenced by the environmental effects and these characters were governed by additive genes and selection will be rewarding for improvement of such traits.
From correlation studies, it was observed that marketable pod yield per plant had exhibited highly significant positive association with number of secondary branches per plant, number of inflorescences per plant, number of pods per inflorescence, number of pods per plant, hundred seed weight (g), pod width and days to last pod harvest.
Path analysis revealed that maximum positive direct effect on marketable pod yield per plant was exhibited through number of secondary branches per plant, followed by number of pods per plant, number of inflorescences per plant, days to first pod harvest and hundred seed weight.
Present results indicate the importance of these traits in selection for marketable pod yield per plant. Direct selection based on these traits would result in simultaneous improvement of aforesaid traits and yield in dolichos bean.
By Mahalanobis' D2 statistic, it could be inferred that, marketable pod yield per ha (84.85%) followed by days to last pod harvest (9.09%), hundred seed weight (3.03%) and days to first pod harvest (3.03%) contributed maximum towards genetic divergence.
The D2 analysis was carried out for 18 characters, which partitioned the twelve genotypes into four clusters. Cluster IV and I had the maximum number of genotypes (4 each) followed by cluster III (3 genotypes) and cluster II (1 genotype). Maximum divergence was observed between cluster I and III, while minimum was between cluster I and II. The maximum intra cluster distance was shown by cluster III. The clusters showing high genetic divergence could be effectively utilized in heterosis breeding programme. This suggested that selection of one or two elite genotypes from divergent clusters (I & III) based on the above characters and crossing would result in more heterosis and novel hybrids.
Therefore, it is emphasized to lay attention on the traits viz., number of inflorescences per plant, number of pos per inflorescence, number of pods per plant, pod width, days to last pod harvest, pod length, hundred seed weight and protein content in crop improvement programme of dolichos bean in future.
Three genotypes viz., GL-243, Culture-47 and GL-671 showed significantly higher yield over the checks. There is a need to evaluate these high yielding genotypes in large plots and over locations in coastal Andhra Pradesh for their commercial utilization.
 
Date 2016-07-25T10:43:30Z
2016-07-25T10:43:30Z
2013-07
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69672
 
Language en
 
Format application/pdf
 
Publisher Dr. Y. S. R. HORTICULTURAL UNIVERSITY