PJB-2006-190
GENOTYPIC VARIATION FOR DROUGHT TOLERANCE IN COTTON (GOSSYPIUM HIRSUTUM L.): SEED COTTON YIELD RESPONSES
IHSAN ULLAH, MEHBOOB-UR-RAHMAN AND YUSUF ZAFAR
Abstract
Instability of cotton yield is partly caused by drought susceptibility. The purpose of this study was to assess genotypic variation for drought tolerance in a set of cotton germplasm using geometric mean (GM) and drought susceptibility index (DSI) as selection criteria and to determine association of these measures with some productivity and physiological attributes. Thirty-two cotton cultivars were evaluated under well-watered (W1) and water-limited (W2) regimes in the field during 2003 and 2004. Drought stress determined by the drought intensity index was more sever in 2004 (0.43) as compared to 2003 (0.21). Genotypic variation was detected for both indices in both the years. Significant negative association of DSI with seed cotton yield, boll number and certain physiological attributes conferring drought tolerance in W2 (P
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