Effect of Terminal Drought Stress on Morpho-physiological Traits of Wheat Genotypes (original) (raw)
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Effect of Drought Stress on the Physiology and Yield of the Pakistani Wheat Germplasms
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International Journal of Research -GRANTHAALAYAH
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International Journal of Plant & Soil Science, 2017
Wheat, the world's third important cereal, is cultivated in Pakistan both in irrigated and rainfed areas. One of the major constraints of wheat production in rainfed area is drought that needs to be addressed. Although many genotypes were released that were tolerant to drought stress by improving various physiological traits but there is a need to lessen the effects of drought to boost wheat productivity. The present study was designed to identify genotype(s) suitable under drought stress by analyzing various physiological traits such as relative water content, cell membrane stability, proline content and chlorophyll content under drought stress. The research material consisted of sixteen different wheat genotypes. The experiment was planted during winter 2013-14 following RCBD with three replications. Drought stress was induced by withholding water during heading and anthesis stages. High heritability, observed for relative water content, proline content and cell membrane stability, indicated that selection would be effective for these traits as they are heritable to next generation. Correlation analysis revealed that cell membrane stability and proline Original Research Article
Biosciences, Biotechnology Research Asia
ABSTRACT: Wheat is an important “rabi” (post-rainy season) crops cultivated on more than 8.0 million hectares in Pakistan. Selection based on different secondary traits enhances the progress and accuracy by which drought tolerant genotypes can be identified. In a glass house experiment, different physical and biochemical characteristics associated with drought adaptation were assessed in twelve (12) wheat genotypes. Drought tolerance index, calculated based on seedling dry weight, exhibited that Pirsabak-2004 was the most drought tolerant genotype. Minimum reduction in dry weight (14.32 %), RWC (14.15 %) and leaf area (5.59%) as well as least increase in H2O2 content (104.9%) was noted in Pirsabak-2004. However, Pirsabak-2008 has suffered minimum reduction in fresh weight (28%) and cellular membranes stability (10.89%). Maximum increase in proline (7.75 fold) and sugar content (163.51 %) was noted in PR-97 and PR-90, respectively. Similarly, Saleem-2000 has incurred the minimum redu...