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Rapid assessment of water severe stress tolerant cotton (Gossypium hirsutum L.) genotypes based on seedling and morph-physiological traits at two moisture levels

Muhammad Ramzan Lund, Haitham Elsayed


Cotton is an important crop of almost all countries. It is the backbone of the textile industry. Water severe stress possesses the most important constraint to plant survival and crop productivity. It is responsible for the shedding of small squares on large scale, resulting in a decrease in flowering. Therefore, the main objective of this study was to assess the response of some cotton genotypes at seedlings stage against water severe stress taken from State Key Laboratory of Cotton Biology-Anyang, CAAS, China. The experiment was conducted under the Randomized Complete Block Design with three replications. The treatment of the experiment included two factors (control 100% and severe stress 50%). After 55 days, fourteen morpho-physiological traits (Transpiration Rate, CO2 assimilation, Stomatal Conductance, Chlorophyll Content, Leaf Temperature, Photosynthesis Rate, New Leaf Area, Stem Diameter, New Internode, Plant Height, Shoot Fresh Weight, Shoot Dry Weight, Root Fresh Weight and Root Fresh Weight) were recorded at seedling stage and compared under control and water severe stress. It was found that highly significant for all traits under treatment levels, reflected the effects of water variability on the traits. Cluster analysis also grouped the genotypes according to their response to water severe stress, detected that the genotypes Zhong 1476, Deltapine 14 and Zhong 915 were the higher tolerant genotypes under water severe stress. These genotypes may be selected and exploited to improve water severe tolerance for the cotton crop breeding programs which have a significant impact to minimize the adverse effects of drought on cotton in an easy and non-expensive way.


Cotton; water stress; morpho-physiological traits; Tolerance

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