evaluation of Groundnut Genotypes for Drought Tolerance Using Line-Source Sprinkler Irrigation Technique
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Date
2011
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Publisher
UAS, Dharwad
Abstract
Fifteen groundnut genotypes were screened using line source sprinkler
irrigation technique (LST) during post rainy season of 2010-2011. The genotypes
were tested in five moisture levels. The results revealed that under severe moisture
deficits (+11.70 to -43.69%), TMV-2 recorded the highest yield followed by ICGV-
91114, ICGV-07328, R-8808, GPBD-4, Dh-86 and ICGV-00351 were found to be
drought tolerant based on biomass MDI, WUE and yield.
The correlation studies indicated that the yield showed significant positive
relationship with days to maturity (r = 0.87**) at 90 DAS, number of primary
branches (r = 0.63*) at 90 DAS, leaf area (r = 0.74*) at 90 DAS, leaf area duration (r
= 0.73*) between 60-90 DAS, leaf area index (r = 0.76*) between 30-60 DAS, crop
growth rate (r = 0.79*) between 30-60 DAS, absolute growth rate (r = 0.92*) between
30-60 DAS and dry matter accumulation (r = 0.69*) at harvest. Similarly the
biophysical parameters like relative water content (r = 0.62*) at 60 DAS, chlorophyll
stability index (r = 0.73*) at 120 DAS and the biochemical parameters like nitrate
reductase activity (r = 0.66*) at 90 DAS and reducing sugar (r = 0.66*) at 90 DAS.
These genotypes possessed lower LA, moderate plant height, higher levels of
RWC, total sugars, nitrate reductase activity, water use efficiency and chlorophyll
stability index. Hence, these indices may be used either to screen or to develop
drought tolerant groundnut genotypes.
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Keywords
Crop Physiology