Chloroplastic photoprotective strategies differ between bundle sheath and mesophyll cells in maize (Zea mays L.) Under drought
文献类型： 外文期刊
作者： Liu, Wen-Juan 1 ; Liu, Hao 2 ; Chen, Yang-Er 3 ; Yin, Yan 4 ; Zhang, Zhong-Wei 5 ; Song, Jun 1 ; Chang, Li-Juan 1 ; Zhang, Fu-Li 1 ; Wang, Dong 1 ; Dai, Xiao-Hang 1 ; Wei, Chao 1 ; Xiong, Mei 1 ; Yuan, Shu 5 ; Zhao, Jun 2 ;
作者机构： 1.Sichuan Acad Agr Sci, Inst Qual Stand & Testing Technol Res, Chengdu, Peoples R China
2.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing, Peoples R China
3.Sichuan Agr Univ, Coll Life Sci, Yaan, Peoples R China
4.Chinese Acad Sci, Plant Sci Facil Inst Bot, Beijing, Peoples R China
5.Sichuan Agr Univ, Coll Resources Sci & Technol, Chengdu, Peoples R China
关键词： bundle sheath chloroplast; drought stress; maize (Zea mays L.); non-photochemical quenching; photoprotection; reactive oxygen species
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）
ISSN： 1664-462X
年卷期： 2022 年 13 卷
页码：
收录情况： SCI
摘要： Bundle sheath cells play a crucial role in photosynthesis in C4 plants, but the structure and function of photosystem II (PSII) in these cells is stilt controversial. Photoprotective rotes of bundle sheath chloroplasts at the occurrence of environmental stresses have not been investigated so far. Non-photochemical quenching (NPQ) of chlorophyll a fluorescence is the photoprotective mechanism that responds to a changing energy balance in chloroplasts. In the present study, we found a much higher NPQ in bundle sheath chloroplasts than in mesophyll chloroplasts under a drought stress. This change was accompanied by a more rapid dephosphorylation of light-harvesting complex II (LHCII) subunits and a greater increase in PSII subunit S (PsbS) protein abundance than in mesophyll cell chloroplasts. Histochemical staining of reactive oxygen species (ROS) suggested that the high NPQ may be one of the main reasons for the lower accumulation of ROS in bundle sheath chloroplasts. This may maintain the stable functioning of bundle sheath cells under drought condition. These results indicate that the superior capacity for dissipation of excitation energy in bundle sheath chloroplasts may be an environmental adaptation unique to C4 plants.
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