有用或仅仅是方便:酶的抗氧化活性可以用作非生物应激耐受性的代理吗?
Le Xu1, Huaqiong Liu1, Ron Mittler2
1MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co-construction by Ministry and Province), College of Agriculture, Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025China.
Journal of experimental botany
|December 28, 2024
概括
较高的抗氧化剂 (AO) 水平可能会阻碍植物的应激耐受性. 这项研究质疑使用酶性AO作为压力指标或目标,因为它们可以干扰关键的活性氧物种 (ROS) 对适应的信号.
科学领域:
- 植物生物学 植物生物学
- 压力生理学 压力生理学
- 生物化学 生物化学
背景情况:
- 植物面临环境压力,改变氧化还原平衡并产生活性氧物种 (ROS).
- 一个复杂的抗氧化剂 (AO) 系统,包括酶和非酶化合物,进化以减轻ROS损伤.
- 传统上,酶性AO被认为是改善植物抗压能力的关键指标和目标.
研究的目的:
- 批判性地评估使用酶性抗氧化剂作为植物耐压力的代理.
- 评估酶性抗氧化剂作为作物遗传改进目标的适用性.
- 研究ROS在氧化损伤之外的作用,作为植物适应过程中的信号分子.
主要方法:
- 文献审查和对植物应激反应现有研究的批判性评估.
- 分析酶性抗氧化剂在植物压力信号传递中的作用.
- 评估构成性抗氧化剂活性对应激适应的影响.
主要成果:
- 越来越多的证据表明,在压力下,AO系统没有变化或下调.
- 反应性氧物种 (ROS) 在植物应激反应中起到关键的信号分子作用.
- 构成性高的抗氧化活性可以破坏ROS介导的信号传递.
结论:
- 酶性抗氧化剂不是植物耐压力的可靠代理.
- 向酶性抗氧化剂可能无法有效地改善作物应激耐受性.
- 高构成性抗氧化剂活性对ROS信号的干扰可能会对植物的压力耐受性有害.
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