Genetics of bruchid (Callosobruchus sp.) resistance and yield in cowpea
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Date
2001
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Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara
Abstract
The present study 'Genetics of bruchid (Callosobruchus sp.) resistance
and yield in cowpea' was undertaken in the Department of Plant Breeding and
Genetics, College of Horticulture, Kerala Agricultural University, Vellanikkara.
The study was carried out to estimate the various genetic parameters of characters,
to identify the yield components, to study association of characters related to pulse
beetle resistance and to identify superior genotypes and hybrids having high yield
and tolerance to pulse beetle.
High variability among parents and hybrids was observed for most of
the yield and bruchid resistance traits. The characters namely number of eggs laid,
number of adult beetles emerged, number of bore holes produced, loss of weight
per seed and tannin content exhibited higher values of heritability, genetic advance
and genotypic coefficient of variation, indicating the preponderance of additive
gene effects.
A positive association was found to exist among yield attributes and
also with yield in parents and hybrids. Genotypes having a thicker seed coat
showed better resistance to pulse beetle attack and this character was found to be
independent in gene action. Kanakamoni among the lines and EC 390231 among
the testers were found to be the most promising genotypes for hybridization and
selection since they recorded high positive gca. For heterosis breeding the crosses
Kanakamoni x IC 201092 followed by C 152 x EC 390231 were found to be
superior for pod yield. Kanakamoni and C 152 among the lines and EC 390231
and IC 201092 among the testers showed high tolerance to pulse beetle attack and
are recommended for evolving resistant varieties using these genotypes through
hybridization and selection. For evolving hybrids showing resistance to pulse
beetle the crosses, C 152 x EC 367711 and V 240 x IC 201092 were rated
supreme.
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PG
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Citation
171733