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Phosphorus (P) is one of the essential nutrient elements for plant development. In this work,  BnPHR1  encoding a MYB transcription activator was isolated from  Brassica napus . The characterization of nuclear localization and transcription activation ability suggest BnPHR1 is a transcriptional activator. The tissue expression and histochemical assay showed that  BnPHR1  was predominantly expressed in roots and modulated by exogenous Pi in transcriptional level in roots under Pi deficiency conditions. Furthermore, overexpression of  BnPHR1  in both Arabidopsis and  B. napus  remarkably enhanced the expression of the Pi-starvation-induced genes including  ATPT2  and  BnPT2  encoding the high-affinity Pi transporter. Additionally, BnPHR1 can  in vivo  bind the promoter sequence of  ATPT2  and  BnPT2  in both Arabidopsis and  B. napus . Possibly, due to the activation of ATPT2 and BnPT2, or even more high-affinity Pi transporters, the excessive Pi was accumulated in transgenic plants, resulting in the crucially Pi toxicity to cells and subsequently retarding plant growth. Given the data together, BnPHR1, as crucial regulator, is regulated by exogenous Pi and directly activates those genes, which promote the uptake and homeostasis of Pi for plant growth.

Brassica napus PHR1 Gene Encoding a MYB-Like Protein Functions in Response to Phosphate Starvation