Genetic analysis of greengram genotypes for shade tolerance
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Date
1998
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Department of Plant Breeding and Genetics, College of Agriculture, Vellayani
Abstract
An investigation was carried out to evaluate the shade tolerance
potential of 25 genotypes of green gram under partially shaded coconut
gardens in the Department of Plant Breeding and Genetics, College of
Agriculture, Vellayani. The genotypes were evaluated in a randomised block
design with three replications and observations were recorded for nineteen
quantitative characters. The genetic parameters, correlation and path
coefficients were studied and a selection index was formulated to identify
superior genotypes.
The genotypes showed significant differences for all the characters
except incidence of pod borer Measurement of periodical shade
intensity did not show significant difference among the plots which indicated
the prevalence of uniform shade. High genotypic coefficient of variation was
observed for leaf area index (flowering) followed by number of abnormal,
oblique, unfilled pods, LAI (pod formation), pod clusters per plant and pods
per plant. High heritability coupled with high genetic advance was recorded
for pods per plant, LAI at flowering and pod formation and pod clusters per
plant indicating additive gene action.
Correlation studies indicated that pods per plant followed by branches
per plant, clusters per plant, photosynthetic efficiency (flowering) and LAI
(flowering) showed strong positive correlation with grain yield whereas days
to blooming, days to first harvest and grains per pod recorded negative
correlation.
The path coefficient analysis revealed high positive direct
contribution of pods per plant to grain yield per plant. In addition, pod length
and plant height also showed positive direct contribution to grain yield per
plant.
A selection index was constructed based on grain yield per plant and 9
yield contributing characters identified through correlation and path analysis.
Five top ranking genotypes viz. IIPRM 3, MGG 314, RMG 353, Ganga 4 and
LGG 460 were identified for cultivation under partially shaded condition of
coconut garden and for further breeding programme.
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PG
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Citation
171363