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MORPHOLOGICAL CHARACTERIZATION OF COWPEA [Vigna unguiculata (L.) Walp] GENOTYPES

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Title MORPHOLOGICAL CHARACTERIZATION OF COWPEA [Vigna unguiculata (L.) Walp] GENOTYPES
 
Creator MADASU BRAHMAIAH
 
Contributor JHANSI RANI, K
 
Subject planting, genotypes, sowing, developmental stages, cowpeas, genetics, yields, biological phenomena, heritability, selection
 
Description The present investigation was undertaken with 40 genotypes of cowpea [Vigna
unguiculata (L.) Walp] which were evaluated in a randomized block design at National
Bureau of Plant Genetic Resources Regional Station (NBPGR), Hyderabad during
Kharif- 2012, for characterization of genotypes based on qualitative and quantitative
characters and to study genetic diversity, variability and character association for
eighteen quantitative traits.
The characters flower colour, pod colour, seed coat colour and eye pattern
differentiated the genotypes more prominently among qualitative characters. The
genotypes were also classified based on quantitative characters. The analysis of
variance revealed significant difference for all the traits. On the basis of the mean
performance, the genotypes NSJ 133 and RJR 229 were superior for earliness, whereas
NSJ 159 and RJR 260 were superior for seed yield.
The estimates of phenotypic and genotypic coefficient of variation, heritability
and genetic advance as per cent of mean were high for plant height, length of main
branch, number of clusters per plant, peduncle length, pods per plant, seed yield per
plant, seedling vigour index and protein content indicated the existence of high degree
of variability and additive gene action in the material under study, offering ample scope
for selection.
Seed yield recorded high positive association with leaf length, number of
primary branches, number of clusters per plant, peduncle length, pods per plant,
seedling vigour index and number of seeds per pod. While, negative association was
observed with days to 50 per cent flowering, days to 80 per cent flowering and
100-seed weight. Path analysis revealed that number of primary branches, pods per
plant, number of seeds per pod had considerable influence on seed yield.
Mahalanobis D2 statistic revealed distinct clustering pattern and considerable
genetic diversity within and between clusters and were grouped into six clusters based
on quantitative characters. Maximum inter cluster distance was observed between
cluster IV and VI indicating, maximum divergence among genotypes. The highest
intra-cluster distance was recorded for cluster VI (26.01).
On the whole, there was considerable diversity and variability for all the eighteen
quantitative characters under study. The characteristics viz., number of primary
branches per plant, number of clusters per plant, peduncle length, pods per plant and
number of seeds per pod and seedling vigour index were identified as yield
components. Considering all these components as selection indices, the genotypes NSJ
159 and RJR 260 are identified for future studies
 
Date 2016-06-16T15:00:08Z
2016-06-16T15:00:08Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67471
 
Language en
 
Relation D9330;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY