CSIRO Agriculture and Food, Wembley, WA 6014, Australia.
College of Plant Protection, Shanxi Agricultural University, Taigu 030801, China.
Int J Mol Sci. 2020 Jun 30;21(13):4657. doi: 10.3390/ijms21134657.
Ethylene is important for plant responses to environmental factors. However, little is known about its role in aphid resistance. Several types of genetic resistance against multiple aphid species, including both moderate and strong resistance mediated by R genes, have been identified in . To investigate the potential role of ethylene, a ethylene- insensitive mutant, , was analysed. The mutant occurs in the accession A17 that has moderate resistance to , and . The mutant resulted in increased antibiosis-mediated resistance against and but had no effect on . When was introduced into a genetic background carrying resistance genes, ( resistance), ( resistance) and ( resistance), it had no effect on the strong aphid resistance mediated by these genes, suggesting that ethylene signaling is not essential for their function. Interestingly, for the moderate aphid resistant accession, the mutant delayed leaf senescence following aphid infestation and reduced the plant biomass losses caused by both and . These results suggest manipulation of the ethylene signaling pathway could provide aphid resistance and enhance plant tolerance against aphid feeding.
乙烯对植物应对环境因素的反应很重要。然而，关于它在抗蚜虫方面的作用知之甚少。在 中已经鉴定出几种对多种蚜虫物种具有遗传抗性的类型，包括由 R 基因介导的中度和强抗性。为了研究乙烯的潜在作用，分析了一个 乙烯不敏感突变体， 。该 突变体发生在对 、 和 具有中度抗性的 A17 品系中。 突变体导致对 和 产生增强的抗生介导抗性，但对 没有影响。当 将 引入携带抗性基因的遗传背景中时， （抗性）、 （抗性）和 （抗性），它对这些基因介导的强抗蚜虫性没有影响，表明乙烯信号传导对于它们的功能不是必需的。有趣的是，对于中度抗蚜虫的品系， 突变体在蚜虫侵害后延迟叶片衰老，并减少 和 引起的植物生物量损失。这些结果表明，乙烯信号通路的操纵可以提供抗蚜虫性并增强植物对蚜虫取食的耐受性。
