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University of Agricultural Sciences, Dharward (2000)

Genotypic Response To Drought Stress in Grounnut (Arachis hypogaea L.)

Suvarna

Titre : GENOTYPIC RESPONSE TO DROUGHT STRESS IN GROUNDNUT (Arachis hypogaea L.)

Auteur : Suvarna

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science 2000

Résumé
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.

Présentation ICRISAT

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