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首页> 美国卫生研究院文献>Physiology and Molecular Biology of Plants >Plant growth under water/salt stress: ROS production; antioxidants and significance of added potassium under such conditions
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Plant growth under water/salt stress: ROS production; antioxidants and significance of added potassium under such conditions

机译：水/盐胁迫下的植物生长：ROS的产生；抗氧化剂和在这种条件下添加钾的意义

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摘要

Plants are confronted with a variety of environmenmtal stresses resulting in enhanced production of ROS. Plants require a threshold level of ROS for vital functions and any change in their concentration alters the entire physiology of plant. Delicate balance of ROS is maintained by an efficient functioning of intriguing indigenous defence system called antioxidant system comprising enzymatic and non enzymatic components. Down regulation of antioxidant system leads to ROS induced oxidative stress causing damage to important cellular structures and hence anomalies in metabolism. Proper mineral nutrition, in addition to other agricultural practices, forms an important part for growth and hence the yield. Potassium (K) is a key macro-element regulating growth and development through alterations in physiological and biochemical attributes. K has been reported to result into accumulation of osmolytes and augmentation of antioxidant components in the plants exposed to water and salt stress. In the present review an effort has been made to revisit the old findings and the current advances in research regarding the role of optimal, suboptimal and deficient K soil status on growth under normal and stressful conditions. Effect of K deficiency and sufficiency is discussed and the information about the K mediated antioxidant regulation and plant response is highlighted.
机译：植物面临各种环境胁迫，导致ROS产生增加。植物需要具有重要功能的ROS阈值水平，其浓度的任何变化都会改变植物的整个生理状态。 ROS的微妙平衡通过一种有趣的本地防御系统（称为抗氧化剂系统）的有效功能来维持，该系统包括酶和非酶成分。抗氧化剂系统的下调导致ROS诱导的氧化应激，导致重要细胞结构受损，从而导致代谢异常。除了其他农业实践外，适当的矿物质营养还对生长以及产量构成重要的组成部分。钾（K）是通过改变生理和生化属性来调节生长和发育的关键宏观元素。据报道，钾在暴露于水和盐胁迫的植物中导致渗透液的积累和抗氧化剂成分的增加。在本综述中，人们努力重新审视关于正常，压力条件下最佳，次优和缺乏钾素土壤状况对生长的作用的研究的旧发现和当前进展。讨论了钾缺乏和充足的影响，并强调了有关钾介导的抗氧化剂调节和植物反应的信息。

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