Photoinhibition of Leaves with Different Photosynthetic Carbon Assimilation Characteristics in Maize (<i>Zea mays</i>)  

作　　者：Yanye Ruan Xiaoyang Li Yanpeng Wang Siqi Jiang Bo Song Zhiyou Guo Ao Zhang Qi Qi Lijun Zhang Jinjuan Fan Yixin Guan Zhenhai Cui Yanshu Zhu 

机构地区：[1]Biological Science and Technology College, Shenyang Agricultural University, Shenyang, China [2]Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang, China [3]Test Site of Shenyang Agricultural University, Shenyang, China [4]Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China

出　　处：《American Journal of Plant Sciences》2017年第3期328-339,共12页美国植物学期刊（英文）

摘　　要：Strong light decreases the rate of photosynthesis and assimilates production of crop plants. Plants with different carbon reduction cycles respond differently to strong light stress. However, variation in photoinhibition in leaves with different photosynthetic characteristics in maize is not clear. In this experiment, we used the first leaves (with an incomplete C4 cycle) and fifth leaves (with a complete C4 cycle) of maize plants as well as the fifth leaves (C3 cycle) of tobacco plants as a reference to measure the photosynthetic rate (PN) and chlorophyll a parameters under strong light stress. During treatment, PN, the maximal fluorescence (Fm), the maximal quantum yield of PSII photochemistry (Fv/Fm), and the number of active photosystem II (PSII) reaction centers per excited cross-section (RC/CSm) declined dramatically in all three types of leaves but to different degrees. PN, Fm, Fv/Fm, and RC/CSm were less inhibited by strong light in C4 leaves. The results showed that maize C4 leaves with higher rates of photosynthesis are more tolerant to strong light stress than incomplete C4 leaves, and the carbon reduction cycle is more important to photoprotection in C4 leaves, while state transition is critical in incomplete C4 leaves.Strong light decreases the rate of photosynthesis and assimilates production of crop plants. Plants with different carbon reduction cycles respond differently to strong light stress. However, variation in photoinhibition in leaves with different photosynthetic characteristics in maize is not clear. In this experiment, we used the first leaves (with an incomplete C4 cycle) and fifth leaves (with a complete C4 cycle) of maize plants as well as the fifth leaves (C3 cycle) of tobacco plants as a reference to measure the photosynthetic rate (PN) and chlorophyll a parameters under strong light stress. During treatment, PN, the maximal fluorescence (Fm), the maximal quantum yield of PSII photochemistry (Fv/Fm), and the number of active photosystem II (PSII) reaction centers per excited cross-section (RC/CSm) declined dramatically in all three types of leaves but to different degrees. PN, Fm, Fv/Fm, and RC/CSm were less inhibited by strong light in C4 leaves. The results showed that maize C4 leaves with higher rates of photosynthesis are more tolerant to strong light stress than incomplete C4 leaves, and the carbon reduction cycle is more important to photoprotection in C4 leaves, while state transition is critical in incomplete C4 leaves.

关 键 词：Fluorescence Transient PHOTOSYSTEM II (PSII) PHOTOPROTECTION Light Stress C4 Photosynthesis 

分 类 号：S5[农业科学—作物学]