College of Biosystems Engineering and Food Science, Zhejiang Key Laboratory for Agri-Food Processing, Zhejiang University, Hangzhou, 310058, China.
Saint-Jean-sur-Richelieu Research and Development Centre, Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu, Quebec, J3B 3E6, Canada.
Plant Cell Environ. 2019 Mar;42(3):815-831. doi: 10.1111/pce.13491. Epub 2019 Jan 28.
Ultraviolet-C (UV-C) radiation has been reported to induce defence responses to pathogens in growing crops and described as a new environmentally friendly method for disease control. However, whether the effect of the induced defence mechanisms will persist after the stress imposed by UV-C is alleviated and how these mechanisms interact with pathogen elicitors upon infection have not yet been investigated. Thus, we inoculated strawberry plants with Mycosphaerella fragariae, the causal agent of leaf spot disease, after 5 weeks of repeated UV-C irradiation treatment (cumulative dose of 10.2 kJ m ) and investigated the alteration of gene expression and biochemical phenotypes. The results revealed that UV-C treatment had a significant impact on gene expression in strawberry leaves and led to the overexpression of a set of genes involved in plant-pathogen interaction. UV-C-treated leaves displayed a stronger response to infection after inoculation, with reduced symptoms and increases in accumulation of total phenolics and volatile terpenes, higher expression of pathogenesis-related proteins and the activity of several defence enzymes. This study presumptively describe, for the first time, the involvement of terpenes, reactive oxygen species, and abscisic acid, salicylic acid, jasmonic acid, and their transduction factors, in the network underpinning UV-C priming of growing crops for improved protection against pathogens.
紫外线-C(UV-C)辐射已被报道可诱导生长作物中的病原体防御反应,并被描述为一种新的环保型疾病控制方法。然而,在缓解 UV-C 施加的胁迫后,诱导的防御机制的效果是否会持续,以及这些机制在感染时如何与病原体激发子相互作用,尚未得到研究。因此,我们在重复 UV-C 辐射处理(累积剂量为 10.2kJ m ) 5 周后,用叶斑病病原体草莓球腔菌(Mycosphaerella fragariae)接种草莓植株,并研究了基因表达和生化表型的变化。结果表明,UV-C 处理对草莓叶片的基因表达有显著影响,并导致与植物-病原体相互作用相关的一组基因的过表达。接种后,经 UV-C 处理的叶片对感染的反应更强,症状减轻,总酚和挥发性萜烯积累增加,与发病相关的蛋白质表达增加,以及几种防御酶的活性增强。本研究首次推测,萜类化合物、活性氧、脱落酸、水杨酸、茉莉酸及其转导因子参与了 UV-C 启动生长作物以增强对病原体的保护的网络。
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