...
首页> 外文期刊>Trends in Plant Science >Futile cycling at the plasma membrane: a hallmark of low-affinity nutrient transport
【24h】

Futile cycling at the plasma membrane: a hallmark of low-affinity nutrient transport

机译:在质膜上无用的循环:低亲和力的营养运输的标志

获取原文
获取原文并翻译 | 示例
           

摘要

Plant nutrient acquisition from concentrated soil solutions is governed by low-affinity transport systems in the plasma membranes of root cells. In this Opinion article, we illustrate that for six major nutrient ions, in addition to influx mediation by low-affinity transporters, high rates of ion cycling at the plasma membrane are a hallmark of nutrient transport at elevated external concentrations. This phenomenon is characterized by high rates of ion influx and concurrent high efflux of the same ion, resulting in efflux:influx ratios close to 1. Prolonged maintenance of futile cellular ion cycling can be energetically unfavorable and detrimental to plant growth and survival. We discuss how ion cycling can contribute to the toxicities of ions such as Na(+) and NH(4)(+) in the low-affinity range of ion provision. We also argue that cellular ion cycling makes the reliable measurement of ion influxes in the low-affinity range a formidable challenge.
机译:从浓缩土壤溶液中获取植物养分受根细胞质膜中低亲和力运输系统的控制。在这篇观点文章中,我们说明了对于六种主要营养物离子,除了通过低亲和力转运蛋白介导的入流外,质膜上高的离子循环速率也是营养物在较高外部浓度下转运的标志。这种现象的特征在于离子流入的速率很高,并且同一离子同时具有较高的流出量,导致流出量与流入量的比率接近1。无用的细胞离子循环的长时间维持可能在能量上不利于植物生长和存活。我们讨论离子循环如何在低亲和力的离子提供范围内促进诸如Na(+)和NH(4)(+)之类的离子的毒性。我们还认为,细胞离子循环使低亲和力范围内离子流入的可靠测量成为一项艰巨的挑战。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号