细胞膜质子泵在水稻耐铵机制中的作用机理探讨

摘要/Abstract

摘要： 水稻是一种典型的耐铵植物。由于铵态氮营养条件会导致根系分泌大量的氢离子，对植物生长产生胁迫。因此，耐铵植物应具备耐酸的能力。细胞膜质子泵具有主动排出质子，调节细胞内外pH的功能。结合目前的研究结果，探讨了水稻根系细胞膜质子泵在铵态氮与低pH两个因素交叉作用下活性的变化及其调节机制，以阐明水稻耐铵的一个必要机制。上述结果对于丰富植物耐铵机制的研究具有重要的理论与实践意义。

关键词: 水稻, 喜铵性, 细胞膜质子泵, 机制

Abstract: The preference of paddy rice for NH4+ rather than NO3- 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 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. The acclimation of plasma membrane H+ ATPase of rice root to low pH may be partly responsible for the preference of rice plants to NH4+ nutrition.

Key words: rice, ammonium preference, H+ -ATPase

朱毅勇,曾后清,狄廷均,徐国华,沈其荣. 细胞膜质子泵在水稻耐铵机制中的作用机理探讨[J]. 中国水稻科学 2011,25(1): 112-118 . .

ZHU Yi-yong,ZENG Hou-qing,DI Ting-jun,XU Guo-hua,SHEN Qi-rong*. Investigation on the Mechanism of Adaption of Plasma Membrane H+ATPase to Ammonium Nutrition in Rice[J]. Chinese Journal of Rice Science 2011,25(1): 112-118 ..

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