The class III peroxidase gene OsPrx24 is important for root Iron plaque formation and benefits phosphorus uptake in Rice plants under alternate wetting and drying irrigation
文献类型： 外文期刊
作者： Yang, Xu-Jian 1 ; Fu, You-Qiang 1 ; Ma, Shuo 1 ; Gan, Haihua 1 ; Xu, Weifeng 3 ; Shen, Hong 1 ;
作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China
2.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Key Lab New Technol Rice Breeding, Guangzhou 510640, Guangdong, Peoples R China
3.Fujian Agr & Forestry Univ, Coll Life Sci, Fuzhou 350002, Fujian, Peoples R China
4.Guangdong Prov Key Lab Ecocircular Agr, Guangzhou 510642, Guangdong, Peoples R China
关键词： Alternate wetting and drying irrigation (AWD); Class III peroxidase (Prx); Hydrogen peroxide (H2O2); Iron plaque; Rice (Oryza sativa)
期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）
ISSN： 0032-079X
年卷期： 2020 年 448 卷 1-2 期
页码：
收录情况： SCI
摘要： Aims Alternate wetting and drying irrigation (AWD) benefits root iron plaque (IP) formation and nutrient uptake, but the underlying mechanism is unclear. Methods RNA-sequencing, histochemical staining, confocal laser microscopy, and transgenic techniques were used to evaluate the contributions of ionic-bonded cell-wall-located class III peroxidases (iPrxs) and hydrogen peroxide (H2O2) to IP formation in rice (Oryza sativa) under AWD. Results AWD significantly enhanced iPrx activity and expression of OsPrx24, a gene encoding iPrx, accompanied by elevated H2O2 accumulation and IP formation. Microscopic analysis indicated that OsPrx24 was mainly expressed in root epidermis, where H2O2 accumulation and IP precipitation also occurred. In an OsPrx24-overexpression line (OsPrx24-OX), the H2O2 concentration was 28.2% lower, and IP formation was 42.6% higher than in the wild type (WT). Treatment with both an iPrx inhibitor and an H2O2 scavenger reduced the IP content, but it was higher in OsPrx24-OX than in the WT under these treatment conditions. Phosphorus concentrations were higher and more IP was found in the roots of OsPrx24-OX than the WT. Conclusion The results imply that OsPrx24 participates in IP formation by regulating iPrx activity and H2O2 concentration under AWD. The results enhance our understanding of IP formation and nutrient uptake in rice.
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