Ambient temperature affects the occurrence and prevalence of plant disease. Most bacterial diseases are damaging at high temperatures. However, kiwifruit bacterial canker caused by pv. () has been found to be prevalent at relatively cool temperatures, and it is unclear how ambient temperature affects the development of kiwifruit bacterial canker. In this study, basal resistance to was suppressed in kiwifruit at cool growth temperature (16 °C) compared with at normal temperature (24 °C). In addition, RNA sequence analysis and ethylene content assessment indicated that ethylene modulated kiwifruit resistance to at normal growth temperature and that cool temperature inhibited ethylene accumulation and -induced activation of the ethylene signaling pathway in kiwifruit. Virus-mediated silencing of the kiwifruit ethylene signaling gene suppressed kiwifruit resistance to at normal growth temperature. Exogenous application of ethylene inhibitor 1-methylcyclopropene eliminated the difference in kiwifruit resistance to at 16 and 24 °C. Exogenous application of ethylene analogues ethephon induced resistance to in kiwifruit. In conclusion, cool temperatures impair basal resistance to by reducing the activation of ethylene biosynthesis and signaling in kiwifruit. The results provide clues for new strategies to control plant diseases in a context of global environmental change.

中文翻译：

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低温抑制猕猴桃中乙烯介导的细菌性溃疡病抗性


环境温度影响植物病害的发生和流行。大多数细菌性疾病在高温下都会造成损害。然而，猕猴桃细菌性溃疡病是由光伏引起的。 ()已被发现在相对较低的温度下流行，目前尚不清楚环境温度如何影响猕猴桃细菌性溃疡病的发展。在这项研究中，与常温（24°C）相比，在凉爽生长温度（16°C）下猕猴桃的基础抗性受到抑制。此外，RNA序列分析和乙烯含量评估表明，乙烯调节猕猴桃对正常生长温度的抗性，而低温抑制猕猴桃中乙烯积累并诱导乙烯信号通路的激活。病毒介导的猕猴桃乙烯信号基因沉默抑制了猕猴桃对正常生长温度的抗性。外源施用乙烯抑制剂1-甲基环丙烯消除了猕猴桃在16℃和24℃下的抗性差异。外源施用乙烯类似物乙烯利诱导猕猴桃产生抗性。总之，低温会降低猕猴桃乙烯生物合成和信号传导的激活，从而损害基础抗性。研究结果为全球环境变化背景下控制植物病害的新策略提供了线索。