Populus cathayana males exhibit more efficient protective mechanisms than females under drought stress

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• 作者：Sheng Zhang^a ; Lianghua Chen^b ; Baoli Duan^a ; Helena Korpelainen^c ; Chunyang Li^a ; ^{licy@cib.ac.cn}
• 关键词：APX ; ascorbate peroxidase ; CE ; carboxylation efficiency ; CP ; CO2 compensation point ; Ci ; intercellular CO2 concentration ; Dw ; dry weight ; FC ; soil field capacity ; E ; transpiration ; Fv/Fm ; the maximum efficiency of PSII ; gs ; stomatal conductance ; Jmax ; the
• 刊名：Forest Ecology and Management
• 出版年：2012
• 期刊代码：54_03781127
• 类别：abs
• 出版时间：1 July, 2012
• 卷：275
• 期：Complete
• 页码：68-78
• 文件大小：1729 K

摘要

The effects of three watering regimes (100%, 50%and 25%of field capacity, FC) on photosynthetic traits and leaves鈥?self-protective systems were investigated in Populus cathayana Rehd. males and females. The results showed that drought (25%of FC) caused disorder in photosynthesis, increased the amounts of osmotically active substances (soluble sugars, proteins and proline), accumulation of reactive oxygen species (ROS), changes in antioxidant enzyme activities and damage in the integrity of cellular membranes and chloroplasts in both males and females. However, compared with drought-stressed females, drought-stressed males showed (1) higher values of net photosynthetic rate (P_n), maximum rate of electron transport driving RuBP regeneration (J_max), maximum rate of RuBP carboxylation (V_cmax), carboxylation efficiency (CE) and non-photochemical quenching coefficient (qP); (2) higher contents of soluble proteins and proline; (3) higher activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), peroxidase (POD) and polyphenoloxidase (PPO); (4) less negative effects on cellular membranes and chloroplasts. These results indicate that P. cathayana males have a better self-protection of the photosynthetic system, greater accumulation of substances for osmotic adjustment and a more efficient enzymatic detoxification cycle for eliminating the negative effects caused by ROS under drought stress than do females.