RICE SCIENCE ›› 2011, Vol. 18 ›› Issue (4): 335-342.

• Review or Special Topic • Previous Articles    

Involvement of Plasma Membrane H+ ATPase in Adaption of Rice to Ammonium Nutrient

  1. Department of Plant Nutrition, College of Resources and Environmental Sciences, Nanjing 210095, China
  • Online:2011-12-28 Published:2011-10-13
  • Contact: XU Guo-hua
  • Supported by:

    the National Natural Science Foundation of China (Grant No. 30971864).

Abstract: The preference of paddy rice for NH4+ rather than NO3ˉ is associated with its tolerance to low pH since a rhizosphere acidification occurs during NH4+ absorption. However, the adaptation of rice root to low pH has not been fully elucidated. The plasma membrane H+-ATPase is a universal electronic H+ pump, which uses ATP as energy source to pump H+ across the plasma membranes into the apoplast. The key function of this enzyme is to keep pH homeostasis of plant cells and generate a H+ electrochemical gradient, thereby providing the driving force for the active influx and efflux of ions and metabolites across the plasma membrane. This study investigated the acclimation of plasma membrane H+-ATPase of rice root to low pH. This mechanism might be partly responsible for the preference of rice plants to NH4+ nutrition. Key words: rice; ammonium nutrient; plasma membrane H+-ATPase

Key words: rice, ammonium nutrient, plasma membrane H+-ATPase