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首页> 外文OA文献 >Plasma Membrane Na+ Transport in a Salt-Tolerant Charophyte (Isotopic Fluxes, Electrophysiology, and Thermodynamics in Plants Adapted to Saltwater and Freshwater).
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Plasma Membrane Na+ Transport in a Salt-Tolerant Charophyte (Isotopic Fluxes, Electrophysiology, and Thermodynamics in Plants Adapted to Saltwater and Freshwater).

机译：耐盐盐藻细胞中的质膜Na +转运（同位素通量，电生理学和适应于咸水和淡水的植物的热力学）。

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In salt-tolerant Chara longifolia, enhanced Na+ efflux plays an important role in maintaining low cytoplasmic Na+. When it is cultured in fresh water (FW), C. longifolia has a higher Na+ efflux than the obligate FW Chara corallina, although pH dependence and inhibitor profiles are similar for both species (J. Whittington and M.A. Bisson [1994] J Exp Bot 45: 657-665). When it is cultured in saltwater, C. longifolia has a Na+ efflux of 264 [plus or minus] 14 nmol m-2 s-1 at pH 7, 13 times higher than FW-adapted cultures and 31 times higher than C. corallina. As in FW-adapted plants, efflux is highest at pH 5, but pH dependence is less steep and more linear in cells adapted to saltwater. In plants of both species from FW cultures, Na+ efflux is inhibited by Li+ at pH 5 but not at pH 7 or 9, whereas in the salt-adapted C. longifolia, Li+ inhibits Na+ efflux at pH 7 and 9 but not at pH 5. Amiloride inhibits Na+ efflux in salt-adapted cells but not in FW cells. We conclude that a new type of Na+ efflux system is induced in salt-adapted plants, although both systems have characteristics suggestive of a Na+/H+ antiport. In all cases, a 1:1 Na+/H+ antiport would have sufficient energy to maintain the cytoplasmic Na+ activities measured at pH 5 and 7 but not at pH 9, which suggests that another efflux system must be operating at pH 9.
机译：在耐盐的Chara longifolia中，增强的Na +外排在维持低细胞质Na +中起重要作用。当在淡水（FW）中进行培养时，长曲叶念珠菌的Na +流出量高于专性的FW菱角珊瑚藻，尽管这两个物种的pH依赖性和抑制剂谱相似（J. Whittington和MA Bisson [1994] J Exp Bot 45：657-665）。当在盐水中培养时，长叶假丝酵母在pH 7时的Na +流出量为264 [正负] 14 nmol m-2 s-1，比适应FW的培养物高13倍，比珊瑚礁高31倍。与适应FW的植物一样，在pH为5时外排量最高，但是在适应盐水的细胞中pH依赖性不那么陡峭，而是更加线性。在FW培养的两种物种的植物中，Li +在pH 5时抑制Na +流出，而在pH 7或9时不受抑制，而在盐适应的长叶梭菌中，Li +在pH 7和9时抑制Na +流出，而在pH 5时没有抑制。阿米洛利抑制盐适应细胞中的Na +外流，但不抑制FW细胞中的Na +外流。我们得出结论，在盐适应植物中诱导了一种新型的Na +外排系统，尽管这两种系统都具有暗示Na + / H +反向转运的特征。在所有情况下，1：1的Na + / H +反转运蛋白将具有足够的能量来维持在pH 5和7而不是pH 9下测得的细胞质Na +活性，这表明另一个外排系统必须在pH 9下运行。

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