| Effects of drought and rewatering on antioxidant system and photosynthetic fluorescence parameters of cotton seedling |
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| DOI：10.7606/j.issn.1000-7601.2016.06.32 |
| Key Words: drought stress rewatering cotton reactive oxygen antioxidant enzymes photosynthetic chlorophyll fluorescence parameters |
| Author Name | Affiliation | | TIAN You-sheng | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | XIE Zong-ming | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | ZHANG Jian-xin | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | DONG Yong-mei | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | LI You-zhong | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | YU Hang | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | WANG Zhi-jun | Biotechnology Research Institute, Xinjiang Academy of Agricultural and Reclamation Science/Xinjiang Production & Construction Group Key Laboratory of Crop Germplasm Enhancement and Gene Resources Utilization, Shihezi, Xinjiang, 832000, China | | ZHANG Cheng-shuang | Weifang Tobacco Co. of Shandong Province, Weifang, Shandong 261000, China |
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| Abstract: |
| In order to study the effects of water stress on photosynthesis and associated physiological characteristics of cotton, and to reveal the relationships between photosynthetic traits, physiological indexes and drought tolerance, drought and rewatering treatments were employed on Xinluzao 19 by weighting the pot to control water amount. The treatments included drought for 0, 2, 4, 6, 8 d and rewatering for 2 d, then the changes in MDA content, H2O2 content, SOD, POD, and CAT indexes and photosynthetic fluorescence parameters of cotton were measured. Reactive oxygen, conductivity and MDA content of cotton leaf were increased with the enhancement of drought stress. Except for H2O2 content, the others were reduced to the control values after rewatering. SOD and CAT of antioxidant enzymes reached the highest activities to clear the excessive reactive oxygen species when the active oxygen content was the highest in cotton leaf. The photosynthesis, stomatal conductance and transpiration rate of cotton function leaf became decreased with the increase of drought stress, and reached the lowest at the 8 th day after drought, then rebounded after rewatering. Photochemical quenching (qP) and yield were reduced with the severity of drought stress, and could not become rebounded after rehydration. Obviously, excessive reactive oxygen species were cleared by increasing the antioxidant activity of cotton under water stress through controlling the stomatal conductance to inhibit photosynthesis and transpiration rate of cotton under water stress. |
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