GENOTYPIC RESPONSE TO DROUGHT STRESS IN GROUNDNUT (Arachis hypogaea L.)
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Date
2000
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University of Agricultural Science, Dharwad
Abstract
The experiment was conducted to evaluate z8ij^5iJ5i3;6lgenot>'pes for
drought tolerance, their physiological response and to assess genetic variability,
association under normal (full iirigation), mid-season (MSD), and end-season drought
(ESD) conditions, in a strip plot design during post rainy season of 1999-2000 at
International Crops Reseaich Institute for the Semi-arid Tropics (ICRISAT), Patancheru,
Hyderabad.
Analysis of variance showed significant differences for all physiological
and yield contributing characters studied except relative leaf water content (RWC) and
light interception (LI) at 90 DAS among the genot>'pes and for number of immature pods
(NIMP) among drought treatments. Significant Genotype X Drought interaction existed
for crop growth rate (CGR), harvest index (HI), RWC, and LI at hai-vest.
Rate of pod addition (RPA), CGR , HI and pod yield were identified as
potential characters for improvement of genotypes under both the drouglit conditions and
LI, number of mature pods (NMP), shelling percentage under MSD and NLN4P. luindred
kernel weight, RWC, specific leaf nitrogen (SLN), partitioning of diyniatter (PDM)
under ESD.
Under MSD, yield was negatively associated with RWC at 90 DAS,
specific leaf area (SLA) at hai-vest and RPA. Under ESD yield was positively associated
with SLN at harvest, rate of kernel and pod development, pod growth rate, hundred
kernel weight and sound mature kernel percentage.
Ba.sed on per sc perfonnance for yield the genotypes ICGV 8603 1. 93261,
93269, 93277, and 92120, R 9214, R 925 land KRG 1 under both the stress conditions
and ICGV 92113 and S 206 only under MSD were identified as high yielding with low
reduction in yield. These genotypes should be tested again under drought conditions in
different locations to identify stable types.
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No. of references 98