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Overexpression of OsPHR3 improves growth traits and facilitates nitrogen use efficiency under low phosphate condition

文献类型： 外文期刊

作者： Sun, Yafei 1 ; Hu, Zhi 1 ; Wang, Xiaowen 3 ; Shen, Xing 1 ; Hu, Siwen 1 ; Yan, Yan 4 ; Kant, Surya 5 ; Xu, Guohua 1 ; Xue, Y 1 ;

作者机构： 1.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Key Lab Plant Nutr & Fertilizat Low Middle Reache, Minist Agr & Rural Affairs, Nanjing 210095, Peoples R China

2.Shanghai Acad Agr Sci, Inst Ecoenvironm & Plant Protect, Shanghai 201403, Peoples R China

3.Nanjing Agr Univ, Coll Hort, Landscape Architecture Dept, Nanjing 210095, Jiangsu, Peoples R China

4.Univ Calif Davis, Coll Biol Sci, Dept Plant Biol, Davis, CA 95616 USA

5.Agr Victoria, Grains Innovat Pk, Horsham, Vic 3400, Australia

关键词： Phosphate; Nitrogen; OsPHR3; Pi deficiency; Nitrogen use efficiency; Transgenic

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2021 年 166 卷

页码：

收录情况： SCI

摘要： Phosphorus (P) and nitrogen (N) are both essential macronutrients for maintaining plant growth and development. In rice (Oryza sativa L.), OsPHR3 is one of the four paralogs of PHR1, which acts as a central regulator of phosphate (Pi) homeostasis, as well being involved in N homeostasis. However, the functions of OsPHR3 in N utilization under different Pi conditions have yet to be fully studied. In this study, we aimed to dissect the effect of OsPHR3-overexpression on N utilization under Pi deficient regimes. Biochemical, molecular and physiological assays were performed to determine the N-influx, translocation, and accumulation in OsPHR3-overexpressing rice lines, grown under Pi-sufficient and -deficient conditions, in both hydroponic and soil systems. Furthermore, important agronomic traits of these plants were also evaluated. The overexpression of OsPHR3 increased N uptake under Pi stress regimes. Increased N uptake also elevated total N concentrations in these plants by inducing N transporter genes expression. Furthermore, overexpression of OsPHR3 increased N use efficiency, 1000-grain weight and grain yield under different Pi conditions. We established new findings that OsPHR3-overexpression facilitates N utilization under Pi deficient conditions. This will help achieving higher yields by coordinating the utilization of N and P.

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