Ye Miao, Zhang Zhengcan, Huang Guanjun, Li Yong
Ministry of Agriculture and Rural Affairs Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Jiangsu Key Laboratory of Crop Cultivation and Physiology, Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China.
Int J Mol Sci. 2022 Mar 31;23(7):3885. doi: 10.3390/ijms23073885.
Leaf photosynthesis is highly correlated with CO-diffusion capacities, which are determined by both leaf anatomical traits and environmental stimuli. In the present study, leaf photosynthetic rate (), stomatal conductance (), mesophyll conductance () and the related leaf anatomical traits were studied on rice plants at two growth stages and with two different N supplies, and the response of photosynthesis to temperature () was also studied. We found that was significantly higher at mid-tillering stage and at high N treatment. The larger was related to a larger chloroplast surface area facing intercellular air spaces and a thinner cell wall in comparison with booting stage and zero N treatment. At mid-tillering stage and at high N treatment, showed a stronger temperature response. The modelling of the - relationships suggested that, in comparison with booting stage and zero N treatment, the stronger temperature response of was related to the higher activation energy of the membrane at mid-tillering stage and at high N treatment. The findings in the present study can enhance our knowledge on the physiological and environmental determinants of photosynthesis.
叶片光合作用与二氧化碳扩散能力高度相关，而二氧化碳扩散能力由叶片解剖特征和环境刺激共同决定。在本研究中，对处于两个生长阶段且施氮量不同的水稻植株的叶片光合速率（）、气孔导度（）、叶肉导度（）及相关叶片解剖特征进行了研究，同时也研究了光合作用对温度（）的响应。我们发现，在分蘖中期和高氮处理下， 显著更高。与孕穗期和不施氮处理相比，更大的 与面向细胞间隙的更大叶绿体表面积和更薄的细胞壁有关。在分蘖中期和高氮处理下， 表现出更强的温度响应。对 - 关系的建模表明，与孕穗期和不施氮处理相比，分蘖中期和高氮处理下 更强的温度响应与该阶段膜的更高活化能有关。本研究结果可增进我们对光合作用生理和环境决定因素的认识。
