Potential for drought tolerance in blackgram (Vigna Mungo L. Hepper)
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Date
1989
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Department of Plant Breeding, College of Agriculture, Vellayani
Abstract
An investigation was carried out in the Department of Plant Breeding, College of Agriculture, Vellayani to evaluate the drought tolerance potential of twenty genotypes of blackgram under moisture stress situation. The variability present in the population was studied and a selection index was worked out to identify desirable genotypes from undesirable ones.
The varieties were evaluated for yield, yield components and other drought tolerant parameters in a field trial in Randomised Block Design with three replications. The varieties tested showed significant difference for most of the drought tolerant parameters. Genotypic coefficient of variation was maximum for free proline content of leaves and minimum for days to first flowering.
Days to maturity, grain-filling period and hundred seed weight exhibited high heritability indicating lesser environmental influence on these characters. Moderate to high heritability and appreciable genetic advance was recorded by leaf area, root/shoot ratio and free proline content of leaves.
The correlation study has revealed that leaf area, free proline content of leaves, root spread, number of pods per plant, number of grains per pod, hundred seed weight and grain size showed positive correlation with grain yield. Days to first flowering, days to maturity and grain-filling period were found to be negatively correlated with grain yield.
A selection index based on yield, yield components and drought tolerant parameters like leaf area, grain- filling period, root/shoot ratio and free proline content of leaves was found to be relatively more efficient than direct selection for yield. Based on index values, five genotypes were found to be drought tolerant.
It can be concluded from the present study that an ideal plant type in blackgram for drought prone area should have early maturity, moderate leaf area, fewer number of stomata, short to medium grain-filling period, high root length and spread and moderate number of pods having maximum grain number and size.
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170201