Abstract
The preference of paddy rice for NH 4 + rather than NO 3 − is associated with its tolerance to low pH since a rhizosphere acidification occurs during NH 4 + 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 NH 4 + nutrition.
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