STABILITY OF SELECTED BLACKGRAM [Vigna mungo (L.) Hepper] GENOTYPES ACROSS ENVIRONMENTS REPRESENTED BY DATES OF SOWING
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Date
2018-08-01
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University of Agricultural Sciences, Bangalore
Abstract
Availability of genetic variation for productivity per se traits in the working germplasm is a prerequisite for breeding crops and blackgram is no exception to this. Blackgram germplasm comprising of 88 accessions with three checks Rashmi, T-9 and DU-1 were evaluated in randomized complete block design (RCBD) at the experimental plots of Department of Genetics and Plant Breeding, University of Agricultural Sciences,
Bengaluru. Data were collected on nine quantitative traits. The estimates of broad-sense
heritability as well as expected GAM were higher for clusters plant-1, pods plant -1 and
seed yield plant-1 than those for other traits. The accessions were grouped into nine
clusters based on K-means clustering. Quantitative traits means of genotypes included in nine clusters differed significantly for three out of nine quantitative traits, while trait
variances were homogenous for all the nine QT’s. Evaluation of 12 promising genotypes
across environments representing three different dates of sowing during 2017 indicated
significant genotype × environment interaction for seed yield plant-1 based on AMMI
model. The genotypes, RU-16-10, IC-261182 and RU-16-11 with lowest estimate of
AMMI stability value (ASV) and Stability index (SI) were identified as stable across
three dates of sowing, while BG-2 and LBG-20 were found specifically adapted to
August sowing for most of the QTs.