数字农科院2.0

Hydrogen peroxide sulfenylates and inhibits the photorespiratory enzyme PGLP1 to modulate plant thermotolerance

文献类型： 外文期刊

作者： Fu, Zheng-Wei;Ding, Feng;Zhang, Bing-Lei;Liu, Wen-Cheng;Huang, Zi-Hong;Fan, Shi-Hang;Feng, Yu-Rui;Lu, Ying-Tang;Hua, Wei

作者机构：

关键词： heat stress;photorespiration;hydrogen peroxide;PGLP1,2-phosphoglycolate

期刊名称： PLANT COMMUNICATIONS

ISSN： 2590-3462

年卷期： 2024 年 5 卷 6 期

页码：

收录情况： SCIE（2024版） ; ; CSCD（2023-2024年度）

摘要： Climate change is resulting in more frequent and rapidly changing temperatures at both extremes that severely affect the growth and production of plants, particularly crops. Oxidative stress caused by high temperatures is one of the most damaging factors for plants. However, the role of hydrogen peroxide (H 2 O 2 ) in modulating plant thermotolerance is largely unknown, and the regulation of photorespiration essential for C3 species remains to be fully clarified. Here, we report that heat stress promotes H 2 O 2 accumulation in chloroplasts and that H 2 O 2 stimulates sulfenylation of the chloroplast-localized photorespiratory enzyme 2-phosphoglycolate phosphatase 1 (PGLP1) at cysteine 86, inhibiting its activity and promoting the accumulation of the toxic metabolite 2-phosphoglycolate. We also demonstrate that PGLP1 has a positive function in plant thermotolerance, as PGLP1 antisense lines have greater heat sensitivity and PGLP1-overexpressing plants have higher heat-stress tolerance than the wild type. Together, our results demonstrate that heat-induced H 2 O 2 in chloroplasts sulfenylates and inhibits PGLP1 to modulate plant thermotolerance. Furthermore, targeting CATALASE2 to chloroplasts can largely prevent the heatinduced overaccumulation of H 2 O 2 and the sulfenylation of PGLP1, thus conferring thermotolerance without a plant growth penalty. These findings reveal that heat-induced H 2 O 2 in chloroplasts is important for heat-caused plant damage.

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