Exogenous Rosmarinic Acid Application Enhances Thermotolerance in Tomatoes.
Exogenous Rosmarinic Acid Application Enhances Thermotolerance in Tomatoes.
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外源迷迭香酸的施用增强番茄的耐热性
DOI：
10.3390/plants11091172
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发表时间：
2022-04-26
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影响因子：
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由于全球气候变暖，高温胁迫已成为植物生长发育的主要威胁，对全球粮食安全构成严峻挑战。因此，有必要探索植物生物活性分子，这可能是增强植物耐热性的一条有前景的途径。迷迭香酸（RA）是一种植物源性酚类化合物，对人体有益，具有促进健康的作用。然而，RA在植物胁迫反应中的作用及其分子机制在很大程度上是未知的。在这项研究中，我们发现外源RA的施用提高了番茄的耐热性。抗坏血酸过氧化物酶（APX）、过氧化氢酶（CAT）、谷胱甘肽还原酶（GR）和脱氢抗坏血酸还原酶（DHAR）等酶促抗氧化剂转录物丰度和酶活性在高温胁迫下得到进一步提高。此外，RA激活了抗氧化系统，调节了细胞氧化还原稳态，并与非酶谷胱甘肽和抗坏血酸的氧化还原状态有关。RNA-seq数据结果显示，转录调控参与了ra介导的耐热性。与此一致的是，RA治疗可大量诱导HsfA2、WRKY家族基因等几种高温应答转录因子的基因表达，这可能有助于热休克蛋白（HSPs）的诱导。总的来说，这些发现不仅提供了RA与植物耐热性之间的直接联系，而且为在全球变暖的未来保护作物免受高温损害提供了有吸引力的方法。
Due to global warming, high-temperature stress has become a major threat to plant growth and development, which causes a severe challenge to food security worldwide. Therefore, it is necessary to explore the plant bioactive molecules, which could be a promising approach to strengthening plant thermotolerance. Rosmarinic acid (RA) serves as a plant-derived phenolic compound and has beneficial and health-promoting effects for human beings. However, the involvement of RA in plant stress response and the underlying molecular mechanism was largely unknown. In this study, we found that exogenous RA application conferred improved thermotolerance in tomatoes. The transcript abundance and the enzyme activity of enzymatic antioxidants, such as ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR), and dehydroascorbate reductase (DHAR), were further promoted by RA treatment in tomato plants subjected to high-temperature stress. Moreover, RA activated the antioxidant system and modulated the cellular redox homeostasis also associated with the redox status of nonenzymatic glutathione and ascorbic acid. The results of RNA-seq data showed that transcriptional regulation was involved in RA-mediated thermotolerance. Consistently, the gene expression of several high temperature-responsive transcription factors like HsfA2, and WRKY family genes were substantially induced by RA treatment, which potentially contributed to the induction of heat shock proteins (HSPs). Overall, these findings not only gave a direct link between RA and plant thermotolerance but also provided an attractive approach to protecting crop plants from high-temperature damage in a global warming future.
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