Rapid recovery of photosynthetic rate following soil water deficit and re-watering in cotton plants (Gossypium herbaceum L.) is related to the stability of the photosystems

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• 作者：Xiao-Ping Yi^a ; ¹ ; Ya-Li Zhang^a ; ¹ ; He-Sheng Yao^a ; Hong-Hai Luo^a ; Ling Gou^a ; Wah Soon Chow^b ; Wang-Feng Zhang^a ; ^{zhwf_agr@shzu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{zwf_shzu@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A ; net CO2 assimilation rate ; APX ; ascorbate peroxidase ; AsA ; ascorbic acid ; CAT ; catalase ; Ci ; intercellular carbon dioxide concentration ; E ; transpiration rate ; ETR ; electron transport flux ; Fm and Fm&prime ; maximal fluorescence in the dark- and light-adapted state ; respectively ; Fo and Fo&prime ; minimal fluorescence in the dark- and light-adapted state ; respectively ; Fs ; steady state fluorescence in the light-adapted state ; Fv/Fm and Fv&prime ; /Fm&prime ; maximum photochemical quantum yield
• 刊名：Journal of Plant Physiology
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：194
• 期：Complete
• 页码：23-34
• 全文大小：2335 K

文摘

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.