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Published on February 8, 2008; 10.1104/pp.107.111443

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Received October 22, 2007
Accepted January 21, 2008

OsPHR2 is involved in phosphate-starvation signaling and excessive phosphate accumulation in shoots of plants

Jie Zhou , FangChang Jiao , Zhongchang Wu , Yiyi Li , Xuming Wang , Xiaowei He , and Ping Wu *

State Key Laboratory of Plant Physiology and Biochemistry, College of Life Science, Zhejiang University, Hangzhou, 310058, P. R. China

* Corresponding author; email: clspwu{at}zju.edu.cn.

Previous research has demonstrated that AtPHR1 plays a central role in Pi-starvation signaling in Arabidopsis (Arabidopsis thaliana). In this work, two OsPHR genes from rice were isolated and designated as OsPHR1 and OsPHR2 based on amino acid sequence homology to AtPHR1. Their functions in Pi-signaling in rice were investigated using transgenic plants. Our results showed that both OsPHR1 and OsPHR2 are involved in Pi-starvation signaling pathway by regulation the expression of Pi starvation-induced genes, while only OsPHR2 overexpression results in the excessive accumulation of Pi in shoots under Pi-sufficient conditions. Under Pi-sufficient conditions, overexpression of OsPHR2 mimics Pi-starvation stress in rice with enhanced root elongation and proliferated root hair growth, suggesting the involvement of OsPHR2 in Pi dependent root architecture alteration by both systematic and local pathways. In OsPHR2-overexpression plants, some Pi transporters were upregulated under Pi-sufficient conditions which correlates with the strongly increased content of Pi. The mechanism behind the OsPHR2 regulated phosphate accumulation will provide useful approaches to develop smart plants with high Pi efficiency.






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