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Efficient scavenging of reactive carbonyl species in chloroplasts is required for light acclimation and fitness of plants

文献类型： 外文期刊

作者： Ji, Daili 1 ; Luo, Manfei 1 ; Guo, Yinjie 1 ; Li, Qiuxin 1 ; Kong, Lingxi 2 ; Ge, Haitao 3 ; Wang, Qi 4 ; Song, Qiulai 4 ; Zeng, Xiannan 4 ; Ma, Jinfang 1 ; Wang, Yingchun 3 ; Meurer, Joerg 5 ; Chi, Wei 1 ;

作者机构： 1.Chinese Acad Sci, Inst Bot, Photosynth Res Ctr, Key Lab Photobiol, Beijing 100093, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Mol Dev Biol, Beijing 100101, Peoples R China

4.Heilongjiang Acad Agr Sci, Inst Crop Cultivat & Tillage, Harbin 150086, Peoples R China

5.Ludwig Maximilians Univ Munchen, Fac Biol, Plant Mol Biol, D-82152 Munich, Germany

6.Chinese Acad Sci, Innovat Acad Seed Design, Beijing 100101, Peoples R China

关键词： Arabidopsis; light acclimation; photosystem II (PSII) repair; reactive carbonyl species (RCS); rice

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Reactive carbonyl species (RCS) derived from lipid peroxides can act as critical damage or signaling mediators downstream of reactive oxygen species by modifying target proteins. However, their biological effects and underlying mechanisms remain largely unknown in plants.Here, we have uncovered the mechanism by which the RCS 4-hydroxy-(E)-2-nonenal (HNE) participates in photosystem II (PSII) repair cycle of chloroplasts, a crucial process for maintaining PSII activity under high and changing light conditions.High Light Sensitive 1 (HLT1) is a potential NADPH-dependent reductase in chloroplasts. Deficiency of HLT1 had no impact on the growth of Arabidopsis plants under normal light conditions but increased sensitivity to high light, which resulted from a defective PSII repair cycle. In hlt1 plants, the accumulation of HNE-modified D1 subunit of PSII was observed, which did not affect D1 degradation but hampered the dimerization of repaired PSII monomers and reassembly of PSII supercomplexes on grana stacks. HLT1 is conserved in all photosynthetic organisms and has functions in overall growth and plant fitness in both Arabidopsis and rice under naturally challenging field conditions.Our work provides the mechanistic basis underlying RCS scavenging in light acclimation and suggests a potential strategy to improve plant productivity by manipulating RCS signaling in chloroplasts.

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