State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
Int J Mol Sci. 2024 Oct 28;25(21):11581. doi: 10.3390/ijms252111581.
is one of the most productive aquatic plants in the world, widely used in food, feed, medicine, and other industries. Predominantly inhabiting temperate marine environments in mid- to high-latitude regions of the Northern Hemisphere, the growth of is significantly limited by high-temperature stress. Abscisic acid (ABA) plays an important role in plant growth and development and stress responses. However, the role of ABA on high-temperature stress tolerance in still needs to be further elucidated. Here, we found that exogenous ABA significantly alleviated disease and decay in under high-temperature stress while also increasing the relative growth rate, chlorophyll fluorescence parameters, photosynthetic pigment, and osmotic substance content. Meanwhile, exogenous ABA enhanced the activity of protective enzymes and up-regulated the transcript levels of antioxidant-related genes, thereby reducing oxidative damage. Most importantly, we observed a significant increase in ABA content and the transcript levels of key genes involved in ABA synthesis in under high-temperature stress, which were further amplified by the addition of exogenous ABA. In conclusion, this study provides evidence that ABA can moderate the detrimental effects of high-temperature stress and provides a theoretical basis for the screening of germplasm resources and the cultivation of new stress-resistant varieties.
是世界上最具生产力的水生植物之一，广泛应用于食品、饲料、医药等行业。主要栖息在北半球中高纬度地区的温带海洋环境中， 的生长受到高温胁迫的显著限制。脱落酸（ABA）在植物生长发育和胁迫响应中起着重要作用。然而，ABA 对 的高温胁迫耐受性的作用仍需要进一步阐明。在这里，我们发现外源 ABA 显著缓解了高温胁迫下 的病害和腐烂，同时提高了相对生长率、叶绿素荧光参数、光合色素和渗透物质含量。同时，外源 ABA 增强了保护酶的活性，并上调了抗氧化相关基因的转录水平，从而减轻了氧化损伤。最重要的是，我们观察到 在高温胁迫下 ABA 含量和参与 ABA 合成的关键基因的转录水平显著增加，而外源 ABA 的添加进一步放大了这一过程。总之，本研究为 ABA 可以缓解高温胁迫的有害影响提供了证据，并为 种质资源的筛选和新的抗逆品种的培育提供了理论依据。
