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As a macronutrient, Phosphorus (P) takes many roles in plant growth and development. It should be significant to explore the molecular mechanism of low-phosphorus stress response of plants. Phosphate starvation response (PHR) transcription factors play important roles in response to phosphorus deficiency stress in plants. In this study, we isolated a gene related to the plant phosphorus signaling system from the acid-soil-resistant centipedegrass ( Eremochloa ophiuroides  [Munro] Hack.), termed  EoPHR2 . The subcellular localization of EoPHR2 protein was observed to be nuclear located. The expression patterns of  EoPHR2  in different tissues and Al/Pi-stress conditions were analyzed by qRT-PCR, they suggested a potential role in response to the multiple-stress under acid soil adversity. Based on the functional identification through transgenic plants, we found that (1)  EoPHR2  is involved in the Pi-signaling pathway, and (2) overexpression of  EoPHR2  mimics Pi-starvation signalling resulting on enhanced roots whether under Pi-deficiency stress or not. In conclusion, EoPHR2 transcription factor plays a role in response to the multiple stresses under acid soil conditions, improving the low-phosphorus stress resistance of  Eremochloa ophiuroides .

EoPHR2 , a Phosphate Starvation Response Transcription Factor, Is Involved in Improving Low-Phosphorus Stress Resistance in Eremochloa ophiuroides