Plant Physiology Preview
Published on July 8, 2005; 10.1104/pp.105.063115
Received March 18, 2005
Returned for revision May 1, 2005
Accepted May 11, 2005
OsPTF1, A Novel Transcription Factor Involved in Tolerance to Phosphate Starvation in Rice
Keke Yi , Zhongchang Wu , Jie Zhou , Liming Du , Longbiao Guo , Yunrong Wu , and Ping Wu *
State Key Laboratory of Plant Physiology and Biochemistry, College of Life Science, Zhejiang University, Hangzhou 310029, People's Republic of China
China National Rice Research Institute, Hangzhou 310006, People's Republic of China
* Corresponding author; email: clspwu{at}zju.edu.cn.
We report here on a novel transcription factor with a basic helix-loop-helix domain for tolerance to inorganic phosphate (Pi) starvation in rice (Oryza sativa L.). The gene is designated OsPTF1. The expression of OsPTF1 is Pi starvation induced in roots while constitutively expressed in shoots, as shown by northern-blot analysis. Overexpression of OsPTF1 enhanced tolerance to Pi starvation in transgenic rice. Tillering ability, root and shoot biomass, and phosphorus content of transgenic rice plants were about 30% higher than those of the wild-type plants in Pi-deficient conditions in hydroponic experiments. In soil pot and field experiments, more than 20% increase in tiller number, panicle weight, and phosphorus content was observed in transgenic plants compared to wild-type plants at low-Pi levels. In Pi-deficient conditions, transgenic rice plants showed significantly higher total root length and root surface area, which results in a higher instantaneous Pi uptake rate over their wild-type counterparts. Microarray analysis for transgenic plants overexpressing OsPTF1 has been performed to investigate the downstream regulation of OsPTF1.
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