PJB-2022-302
Cotton germplasm characterization for drought tolerance based on morpho-physiological and quality parameters.
Muhammad Asif
Abstract
Drought tolerance is a quantitative trait which is very hard to manipulate in allotetraploid cotton (Gossypium hirsutum L.) using breeding approaches. The future scenario of limited water resources, demands efficient screening approach for developing drought tolerant cotton varieties, which can save major share of irrigated water during the summer. Therefore, the present study was designed to statistically analyze the morphological, physiological and quality parameters related to drought tolerance which is comprehensive approach to select desirable genotypes from the available cotton germplasm. These parameters were measured for the plants grown under field conditions. A huge germplasm 150 cotton genotypes were studied at two water regimes i.e. normal and water stress condition for two cotton growing seasons during 2015-2017. Significant differences were observed for all the treatments, genotypes and Genotype × Environment interaction for all the morphological, physiological and quality parameters. Additive Main effects and Multiplicative Interaction (AMMI) analysis and AMMI biplot analysis revealed that the cotton genotypes FH-900, FH-901, FH-312, AS-1, AS-2, AS-3, RH-510, RH-627, AR-2, AR-9, BH-118, BH-175, SLH-74, CIM-1100, CIM-598 and MM-58 were drought tolerant and ranked highest with respect to stress condition. Correlation studies were also performed to work out the relationship of important traits with respect to drought tolerance. The drought tolerant cotton genotypes identified in this study will be used in a plant breeding program for improvement against drought tolerance in cotton.
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