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GWAS unravels acid phosphatase ACP2 as a photosynthesis regulator under phosphate starvation conditions through modulating serine metabolism in rice

文献类型： 外文期刊

作者： Liu, Sushuang;Xu, Zhan;Essemine, Jemaa;Liu, Yanmin;Liu, Chundong;Zhang, Feixue;Iqbal, Zubair;Qu, Mingnan

作者机构：

关键词： （2-0-3）phosphate starvation;GWAS;photosynthetic adaption;photosynthetic phosphate use efficiency;genetic variation;SNP;rice

期刊名称： PLANT COMMUNICATIONS

ISSN： 2590-3462

年卷期： 2024 年 5 卷 7 期

页码：

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

摘要： Inorganic phosphorus (Pi) deficiency significantly impacts plant growth, development, and photosynthetic efficiency. This study evaluated 206 rice accessions from a MiniCore population under both Pi-sufficient (Pi + ) and Pi-starvation (Pi ) conditions in the field to assess photosynthetic phosphorus use efficiency (PPUE), defined as the ratio of A satPi to A satPi+ . A genome-wide association study and differential gene expression analyses identified an acid phosphatase gene ( ACP2 ) that responds strongly to phosphate availability. Overexpression and knockout of ACP2 led to a 67% increase and 32% decrease in PPUE, respectively, compared with wild type. Introduction of an elite allele A, by substituting the v5 SNP G with A, resulted in an 18% increase in PPUE in gene-edited ACP2 rice lines. The phosphate-responsive gene PHR2 was found to transcriptionally activate ACP2 in parallel with PHR2 overexpression, resulting in an 11% increase in PPUE. Biochemical assays indicated that ACP2 primarily catalyzes the hydrolysis of phosphoethanolamine and phospho-L-serine. In addition, serine levels increased significantly in the ACP2 v8G- overexpression line, along with a concomitant decrease in the expression of all nine genes involved in the photorespiratory pathway. Application of serine enhanced PPUE and reduced photorespiration rates in ACP2 mutants under Pi-starvation conditions. We deduce that ACP2 plays a crucial role in promoting photosynthesis adaptation to Pi starvation by regulating serine metabolism in rice.

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