A plasma membrane transporter coordinates phosphate reallocation and grain filling in cereals
文献类型： 外文期刊
作者： Ma, Bin 1 ; Zhang, Lin 4 ; Gao, Qifei 5 ; Wang, Junmin 7 ; Li, Xiaoyuan 1 ; Wang, Hu 2 ; Liu, Yu 8 ; Lin, Hui 1 ; Liu, Jiyun 2 ;
作者机构： 1.ShanghaiTech Univ, Sch Life Sci & Technol, Shanghai, Peoples R China
2.Chinese Acad Sci, Inst Plant Physiol & Ecol, CAS Ctr Excellence Mol Plant Sci, Natl Key Lab Plant Mol Genet, Shanghai, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Yangzhou Univ, Coinnovat Ctr Modern Prod Technol Grain Crops, Yangzhou, Jiangsu, Peoples R China
5.Northwest Univ, Sch Life Sci, Xian, Peoples R China
6.Univ Calif Berkeley, Dept Plant & Microbial Biol, Berkeley, CA 94720 USA
7.Zhejiang Acad Agr Sci, Inst Crops & Nucl Technol Utilizat, Hangzhou, Peoples R China
8.Zhejiang Univ, Inst Crop Sci, State Key Lab Rice Biol, Hangzhou, Peoples R China
期刊名称：NATURE GENETICS （ 影响因子：27.603； 五年影响因子：30.331 ）
ISSN： 1061-4036
年卷期：
页码：
收录情况： SCI
摘要： Phosphate (Pi) is essential to plant growth and crop yield. However, it remains unknown how Pi homeostasis is maintained during cereal grain filling. Here, we identified a rice grain-filling-controlling PHO1-type Pi transporter, OsPHO1;2, through map-based cloning. Pi efflux activity and its localization to the plasma membrane of seed tissues implicated a specific role for OsPHO1;2 in Pi reallocation during grain filling. Indeed, Pi over-accumulated in developing seeds of the Ospho1;2 mutant, which inhibited the activity of ADP-glucose pyrophosphorylase (AGPase), important for starch synthesis, and the grain-filling defect was alleviated by overexpression of AGPase in Ospho1;2-mutant plants. A conserved function was recognized for the maize transporter ZmPHO1;2. Importantly, ectopic overexpression of OsPHO1;2 enhanced grain yield, especially under low-Pi conditions. Collectively, we discovered a mechanism underlying Pi transport, grain filling and P-use efficiency, providing an efficient strategy for improving grain yield with minimal P-fertilizer input in cereals. A plasma membrane transporter OsPHO1;2 coordinates phosphate reallocation essential for starch biosynthesis during grain filling of cereal crops, providing a potential breeding target for improving phosphate-use efficiency.
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