《植物生理学报》 2016, 52(12): 1773-1784

钾素调控植物光合作用的生理机制

陆志峰, 鲁剑巍, 潘勇辉, 鲁飘飘, 李小坤, 丛日环, 任涛^*

华中农业大学微量元素研究中心, 农业部长江中下游耕地保育重点实验室, 武汉430070

通信作者：任；E-mail: rentao@mail.hzau.edu.cn

摘　要：

钾是植物生长发育所必需的矿质元素, 在调节植物光合作用上具有重要作用。本文以影响植株光合能力变化的两个关键因子(光合面积和净光合速率)为核心, 阐述钾对植物光合面积形成的生理基础, 并重点分析了钾在调节叶片净光合速率限制因子(气孔导度、叶肉导度和生理生化限制)上的作用机制, 同时探讨了限制因子与叶片钾含量的关系, 并对有待深入研究的问题和方向进行了展望。

关键词：缺钾胁迫; 光合面积; 光合作用限制; 叶肉导度; 叶绿体

收稿：2016-09-14   修定：2016-10-21

资助：国家自然科学基金(31672231)和国家油菜产业技术体系建设专项(CARS-13)。

Physiological mechanisms in potassium regulation of plant photosynthesis

LU Zhi-Feng, LU Jian-Wei, PAN Yong-Hui, LU Piao-Piao, LI Xiao-Kun, CONG Ri-Huan, REN Tao^*

Microelement Research of Center, Huazhong Agricultural University; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China

Corresponding author: REN Tao; E-mail: rentao@mail.hzau.edu.cn

Abstract:

Potassium (K), one of the mineral elements essential for plant growth and development, is important for plant photosynthesis regulation. Here, we focus on the two pivotal factors, i.e., leaf area and net photosynthetic rate, that play vital roles in regulating whole plant photosynthesis. In this article, we firstly reviewed the physiological basis in K regulation of leaf area components and photosynthetic limitations (stomatal conductance, mesophyll conductance and biochemical limitations). Then, the relationship between photosynthetic limitations and leaf K concentration was analyzed. Knowledge gaps are also identified.

Key words: potassium deficiency; photosynthetic area; photosynthetic limitation; mesophyll conductance; chloroplast