VARIABILITY AND GENETIC DIVERSITY STUDIES IN FRENCH BEAN (Phaseolus vulgaris L.)
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Date
2016-08
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University of Horticultural Sciences, Bagalkot
Abstract
An investigation on “Variability and genetic diversity studies in French bean
(Phaseolus vulgaris L.)” was undertaken during rabi season of 2015. Thirty six french
bean genotypes were evaluated in randomized complete block design with two
replication in sector No. 1 under University of Horticultural Sciences, Bagalkot.
Analysis of variance revealed highly significant difference among genotypes
for all 27 characters studied. Moderate genotypic and phenotypic coefficient of
variations were observed for pod length, pod flesh thickness, number of pods per
cluster, number of pods per plant, weight of ten pods and dry matter content of pods
and roots. High heritability along with high genetic advance as per cent over mean
was recorded for the plant height, pod width, number of pods per plant, average pod
weight, yield per plant, number of root nodules per plant, dry matter content of pods,
roots and protein content. These results indicated the presence of additive gene
effects. Thus, there is an ample scope for improving these characters with direct
selection.
Correlation studies revealed that total yield per plant was positively and
significantly (p=0.01) associated with all the characters except days to first
flowering, days to 50% flowering, days to first pod picking and pod width. Path
analysis studies revealed high direct effects of number of clusters per plant, number of
pods per cluster and weight of ten pods on total yield per plant.
Mahalonobis D2 analysis grouped 36 genotypes into 5 clusters. The cluster I
showed maximum intracluster distance and maximum intercluster distance was
observed between cluster II and cluster V. Number of pods per plant contributed
(27.46%) maximum to the total divergence followed by yield per plant and drymatter
content of pods. Hybridization studies can be planned by involving genotypes
belonging to cluster II and cluster V. The high yielding genotypes IIHR-62, Arka
Arjun, IIHR-53, IIHR-232 and Arka Anoop are high yielders having desirable quality
characters. Hence there need to be assessed further for stability before exploiting them
for commercial cultivation.
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