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首页> 外文期刊>Australian Journal of Crop Science >Research advances on nitrate nitrogen reutilization by proton pump of tonoplast and its relation to nitrogen use efficiency
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Research advances on nitrate nitrogen reutilization by proton pump of tonoplast and its relation to nitrogen use efficiency

机译：质子泵质子泵硝态氮再利用及其与氮素利用效率的关系研究进展

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Large amount of N0 -3 -N are accumulated in vacuole, and cannot be timeously reducted, reutilized and transported into cytoplasm. It is the main reason for great N0 -3 -N accumulation in vacuole and nitrogen (N) use efficiency cannot be further improved. Transport mechanism of N0 -3 -N across tonoplast is explained in this paper, there are two proton pumps (H +-ATPase and H+-PPase) on tonoplast with absolutely different biology functions and physical characteristic. Mg·ATP and Mg·PPi are the specific substrates of H+-ATPase and H+-PPase respectively, hydrolysis H+ is pumped into vacuole, and contribution to build electrochemical proton gradient between cytoplasm and vacuole. N0 -3 -N transport from vacuole to cytoplasm greatly depends on electrochemical proton gradient, N0 - + -3 -N transport from cytoplasm to vacuole is mainly achieved by vacuole H /N03 antiport system, while symport system (vacuole N0 -3 -N combined with anion) is of benefit for vacuole N0 - 3 -N transporting into cytoplasm. N0 - 3 -N transported by proton pump of tonoplast is influenced by NR activity in cytoplasm, N0 -3 -N can be continuing assimilation and reduction by NR in cytoplasm, and accelerating vacuole N0 -3 -N transported into cytoplasm. These results will supply references and research forecast for further study on efficiency and practicable methods of N utilization, and improving reuse efficiency of N0 -3 -N in plant tissues.
机译：大量的N0 -3-N积累在液泡中，不能及时还原，再利用和运输到细胞质中。这是液泡中N0 -3 -N大量积累的主要原因，而氮（N）的利用效率无法进一步提高。本文解释了N0 -3 -N跨液泡膜的运输机制，在液泡膜上有两个质子泵（H + -ATPase和H + -PPase），它们的生物学功能和物理特性完全不同。 Mg·ATP和Mg·PPi分别是H + -ATPase和H + -PPase的特异性底物，水解H +被泵入液泡，并在细胞质和液泡之间建立电化学质子梯度。 N0 -3 -N从液泡到细胞质的转运很大程度上取决于电化学质子梯度，N0-+ -3 -N从细胞质到液泡的转运主要是通过液泡H / N03反向转运系统实现的，而同质转运系统（真空N0 -3 -N结合阴离子）有利于空泡N0-3 -N转运到细胞质中。液泡质子泵转运的N0-3 -N受细胞质中NR活性的影响，N0 -3 -N可被细胞质中的NR持续同化和还原，并加速转运至细胞质中的液泡N0 -3 -N。这些结果将为进一步研究氮素利用效率和实用方法，提高植物组织中N0 -3 -N的再利用效率提供参考和研究前景。

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