Genetic variability in yard long bean (Vigna unguiculata subsp. sesquipedalis (L.) Verdcourt)
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Date
1998
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Department of Horticulture, College of Agriculture, Vellayani
Abstract
Thirty yard long bean genotypes varying in morphological traits collected from
the southern parts of Kerala were evaluated in an RBD with three replications in the
Department of Horticulture, College of Agriculture, VelJayani during 1996-97. The
objective was to assess the variability existing in the germplasm in yield, yield
attributes, morphological characters and pest and disease resistance and to identify
suitable lines for further breeding programmes.
Variability analysis revealed significant difference among the genotypes for all
the characters studied. GCV and PCV were highest for pod yield per plant followed
by pods per kg.
High heritability coupled with high genetic gain was observed for pod yield per
plant, pods per kg, inflorescence per plant, pod weight and keeping quality of pods. ~
Pod yield per plant was strongly associated with pod weight, pod length, pods
per kg and pods per plant. Path analysis revealed that the primary yield contributors
were pods per plant followed by pod weight owing to their high positive direct effects.
Genotypes VS-6 and VS-11 recorded the maximum selection index scores and
the minimum was for VS-16 followed by VS-I O,
Mahalanobis D2 analysis could group the genotypes into four clusters, cluster
TV being the largest with 18 genotypes with the highest intrac1uster 02 value. Cluster 1
and III were the most distant clusters and the genotypes belonging to these clusters
can be utilized in hybridisation breeding
Genetic catalogueing of the genotypes were made using standard dcscriptors
Association between flower colour, stem colour, pod pigmentation and seed colour
was noticed.
1/ Scoring for major diseases and pests revealed that cow pea mosaic and
American serpentine leaf miner was affecting almost all the yard long bean genotypes
to varying degrees.
Genotypes VS-IS, VS-31, VS-9, VS-S and VS-3 were found elite and can be
used for future breeding programmes.
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Citation
171374