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GENETIC DIVERGENCE STUDIES IN INDIGENOUS FRENCH BEAN (Phaseolus vulgaris L.) GERMPLASM

KrishiKosh

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Title GENETIC DIVERGENCE STUDIES IN INDIGENOUS FRENCH BEAN (Phaseolus vulgaris L.) GERMPLASM
 
Creator P. ARUN KUMAR
 
Contributor Dr. R.V.S.K. REDDY
 
Subject genetic variability ,genetic divergence,local landraces ,Genetic advance
 
Description A field experiment was conducted to estimate the genetic variability and genetic divergence in French bean and to carry out yield component analysis through correlation and path analysis. Forty one local landraces along with three checks were sown in a randomized block design with three replications, during rabi 2011-12 at the NBPGR Regional Station, Rajendranagar, Hyderabad. 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 among genotypes indicating presence of sufficient amount of variability in all the characters studied. Wide range of variability was observed for marketable pod yield per plant, pod weight and number of pods per plant indicating the scope for selection of suitable breeding material for further improvement. On the basis of mean performance of the genotypes among traits studied, AUV-315, SRS-13456, SRS-13451and SRS-13443 were identified as promising lines for further crop improvement.
Genetic advance as percent of mean, Genotypic and Phenotypic coefficient of variation values was on par for most of the characters which indicates the influence of environment on the trait (s) was very negligible. The values observed were not confounding with the environment. It is a true reflection of homeostasis or buffer reaction of the gene. Thus, the true reflection of the trait is exhibited. A true agreement with GCV and PCV values for the eighteen characters was noticed, indicating additive genetic variance governing the high heritability coupled with high genetic advance as percent of mean. Thus, a breeder can employ simple selection which will be rewarding to improve all the characters except for days to last pod harvest wherein high heritability coupled with moderate GA as per cent of mean indicates additive and non additive action controlling the trait.
By Mahalanobi`s D2 statistic, it could be inferred that 100 seed weight, followed by pod weight, protein content, days to first flowering, length of inflorescence, number of inflorescences per plant, number of pods per inflorescence, days to last pod harvest, plant height, marketable pod yield per plant, days to first pod harvest, pod length, number of flowers per inflorescence, number of pods per inflorescence and number of seeds per pod contributed maximum towards genetic divergence. The D2 analysis partitioned forty four genotypes into seven clusters. Maximum divergence was observed between cluster III and VI, while minimum was between cluster VI and I. The maximum intracluster distance was shown by cluster V. The clusters showing high genetic divergence could be effectively utilized in heterosis breeding programme.
From correlation studies it was observed that marketable pod yield per plant has exhibited highly significant positive association with length of inflorescence followed by number of inflorescences per plant, number of flowers per inflorescence, number of pods per inflorescence, pod length, pod weight, number of pods per plant and number of seeds per pod.
Path analysis revealed that maximum positive direct effect on marketable pod yield per plant was exhibited through number of pods per plant followed by pod weight and days to 50 percent flowering. Pod weight, pod width and number of seeds per pod exhibited high, moderate and low positive indirect effect on marketable pod yield per plant.
Thus, French bean genotypes exhibited high variability for all the qualitative traits viz., plant, flower, pod and seed characters.
Therefore, it is emphasized to lay attention on the traits viz., number of pods per plant, pod weight, days to last pod harvest, pod length and protein content in crop improvement programme of French bean in future.
 
Date 2016-07-23T10:45:53Z
2016-07-23T10:45:53Z
2012-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69493
 
Language en
 
Format application/pdf
 
Publisher Dr. Y. S. R. HORTICULTURAL UNIVERSITY