叶肉导度的组成、大小及其对环境因素的响应

李勇*, 彭少兵, 黄见良, 熊栋梁, 刘茜
华中农业大学植物科学技术学院, 农业部长江中游作物生理生态与耕作重点实验室, 武汉430070

通信作者:李勇;E-mail: liyong@mail.hzau.edu.cn;Tel: 027-87288188

摘 要:

植物光合作用过程中, 大气中的CO2需要克服气孔和叶肉细胞等阻力传输到羧化位点。CO2从气孔下腔传输到羧化位点的阻力称为叶肉阻力, 其倒数即为叶肉导度。近十年内, 叶肉导度已经成为光合作用研究领域的一个重要方面。本文首先系统地阐述了叶肉导度的组成及各部分所占的比重; 然后通过与气孔导度的比较, 分析叶肉导度的大小及其对光合作用的影响; 最后阐述了叶肉导度对环境变化的响应, 并分析了其中可能的原因。

关键词:光合作用; 叶肉导度; 细胞壁厚度; 水通道蛋白; 叶绿体

收稿:2013-07-02   修定:2013-08-28

资助:收稿 修定 资助 长江学者和创新团队发展计划项目(IRT1247)和中央高校基本科研业务费专项资金(2013PY107和2012SC13)。

Components and Magnitude of Mesophyll Conductance and Its Responses to Environmental Variations

LI Yong*, PENG Shao-Bing, HUANG Jian-Liang, XIONG Dong-Liang, LIU Xi
Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, Ministry of Agriculture, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China

Corresponding author: LI Yong; E-mail: liyong@mail.hzau.edu.cn; Tel: 027-87288188

Abstract:

Photosynthesis requires CO2 to diffuse from atmosphere to chloroplasts, through stomata and mesophyll cells. The resistance from substomata to carboxylation sites is mesophyll resistance, the reciprocal of which is termed mesophyll conductance (gm). In the recent 10 years, gm has been one of the most important parts in photosynthesis research. In this paper, we firstly discussed the components of gm, and further estimated their relative contributions to gm. Then, the magnitude of gm and its contribution to photosynthesis were analyzed through comparison with stomatal conductance (gs). Finally, rapid response of gm to environmental changes and the possible reasons were discussed.

Key words: photosynthesis; mesophyll conductance; cell wall thickness; aquaporin; chloroplast

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