期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 194, 期 -, 页码 23-34出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2016.01.016
关键词
Cotton; Water deficit; Re watering; Photosynthesis; ROS metabolism
资金
- National Natural Science Foundation of China [31260295, U1203283]
- Specialized Research Fund for the Doctoral Program of Higher Education [20126518120002]
- China Scholarship Council
The responses of gas exchange, chlorophyll fluorescence and the anti-oxidative system of cotton leaves were studied during water deficit and recovery. The results show that water deficit led to a reversible reduction in the photosynthetic rate. This reduction was mainly accompanied by stomatal limitation. The activity of photosystem II (PSII) and photosystem I (PSI) was relatively stable during water deficit and recovery. Water deficit caused an enhanced production of reactive oxygen species (ROS) and increased lipid peroxidation. Proline accumulation and the anti-oxidative enzymes such as superoxide dismutase (SOD), ascorbate peroxidase (APX) and peroxidase (POD), along with the antioxidant ascorbate (AsA), increased during water deficit. On re-watering, the ROS generation rate, anti-oxidative enzymes activities and the extent of the lipid peroxidation returned to near control values. Overall, rapid recovery of the photosynthetic rate is related to the stability of the photosystems which appears to be a critical mechanism allowing cotton plants to withstand and survive drought environments. (C) 2016 Elsevier GmbH. All rights reserved.
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