title: OsPHR2 is involved in phosphate-starvation signaling and excessive phosphate accumulation in shoots of plants.
abstract: Previous research has demonstrated that AtPHR1 plays a central role in phosphate (Pi)-starvation signaling in Arabidopsis thaliana. In this work, two OsPHR genes from rice (Oryza sativa) 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 of the expression of Pi-starvation-induced genes, whereas 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 up-regulated under Pi-sufficient conditions, which correlates with the strongly increased content of Pi. The mechanism behind the OsPHR2 regulated Pi accumulation will provide useful approaches to develop smart plants with high Pi efficiency.
authors.affiliation: State Key Laboratory of Plant Physiology and Biochemistry, College of Life Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhou
authors.forename: FangChang
authors.initials: F
authors.lastname: Jiao
authors.forename: Zhongchang
authors.initials: Z
authors.lastname: Wu
authors.forename: Yiyi
authors.initials: Y
authors.lastname: Li
authors.forename: Xuming
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaowei
authors.initials: X
authors.lastname: He
authors.forename: Weiqi
authors.initials: W
authors.lastname: Zhong
authors.forename: Ping
authors.initials: P
authors.lastname: Wu
mesh_terms: D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D003001:Cloning, Molecular; D012275:Oryza / Q000235:genetics / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism*; D018520:Plant Shoots / Q000378:metabolism*; D030821:Plants, Genetically Modified; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D010710:Phosphates; C496226:Phr2 protein, Arabidopsis