当前位置: 首页 > 文章 > 植物吸收铵态氮的分子生物学基础 植物营养与肥料学报 2007,13 (3) 512-519
Position: Home > Articles > The molecular basis of ammonium transporters in plants Journal of Plant Nutrition and Fertilizers 2007,13 (3) 512-519

植物吸收铵态氮的分子生物学基础

作  者:
邓若磊;徐海荣;曹云飞;肖凯
单  位:
河北农业大学农学院
关键词:
植物;铵离子;铵转运蛋白;基因表达;调节
摘  要:
植物对铵离子的吸收和铵离子在细胞间的转运是铵转运蛋白介导的需能主动运输过程。植物铵转运蛋白位于细胞膜上,含有101~1个跨膜域,分子量约为48 kD。研究表明,植物体内的铵转运蛋白由小基因家族成员编码,在表达特性上不同成员具有时空特异性。植物体内铵转运蛋白在功能、生化特性和转录调节水平上存在差异。在不同氮素水平下,铵转运蛋白基因通过转录和翻译调控,对于保持植株的适宜氮素供应以及氮胁迫条件下维持植物细胞中氮素的内稳态具有重要作用。
译  名:
The molecular basis of ammonium transporters in plants
作  者:
Deng Ruo-lei,Xu Hai-rong,Cao Yun-fei,Xiao Kai(College of Agronomy,Agricultural University of Hebei,Baoding 071001,China)
关键词:
plant;NH+4;ammonium transporter;gene expression;regulation
摘  要:
The nitrogen uptake and transportation of NH+4 among different cells in plant tissues and organs are mediated by the ammonium transporters(AMTS).At the same time,the energy stored in the plasma membrane H+ gradient provides the power to drive NH+4 transport.In plant species,the ammonium transporters, each containing ten to eleven transmembrane domains,are located at the cytoplasm membrane.The molecular weight of AMT is about 48 kD.The ammonium transporters in plant species belong to a small gene family.The members in this family show different expression patterns at the transcription level.The differing affinities for NH+4 and responsiveness to nitrogen,and the varied patterns of expression among the plant ammonium transporters,suggesting that they perform different,but perhaps overlapping,physiological functions.Therefore,the regulation of the ammonium transporters at transcription and translation levels is important for plants maintaining suitable amount of nitrogen under variable NH+4 conditions and plays an important role to sustain a suitable nitrogen balance in plants under the nitrogen stress condition.

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