Antioxidant and Photosynthetic Responses of Cotton to Soil Drought Stress during Flowering and Fruiting Stage |
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| Institution: | Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, College of Agronomy, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China |
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| Abstract: | Objective] The purpose of this study was to examine potential drought tolerance mechanisms in cotton (Gossypium hirsutum L.). Biochemical (antioxidant, protein and compatible osmolyte) and physiological (photosynthesis) responses to drought stress during the flowering and fruiting stages were examined. Method] Using two cotton genotypes (A001 and A705) with different drought tolerance, a pot study was conducted in 2016 with treatments consisting of control (well-watered) and water stress. Water stress treatment was designed as withholding water from the pots until stomatal closure followed by limited water supply for 25 days where water-stressed plants received 40% of the optimum quantity of water. Measurements were made on soluble protein, proline and malonaldehyde (MDA) concentrations, peroxidase (POD) activity and photosynthetic characteristics (net photosynthetic rate Pn, transpiration rate E, stomatal conductance Gs) during the period of water stress. Result] The soluble protein concentration was decreased and POD activity and MDA level were increased in the leaf subtending cotton boll of A001 under water deficit when compared with the control, but no response was observed in A705. Proline level responded to water deficit inconsistently between the two genotypes and across all sampling dates. Water stress significantly decreased Pn, E and Gs in the main stem leaves for both A001 and A705. Conclusion] The results indicated that POD, soluble protein and MDA are involved in A001 and A705 responses to water deficit, and A705 is more tolerant to soil drought than A001. |
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| Keywords: | Gossypium hirsutum L leaf subtending cotton boll drought stress antioxidant photosynthesis |
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