在急性树下,挥发性线索在调解树主体-细菌-昆虫相互作用中的作用在急性树下降
Gareth A Thomas1, John C Caulfield1, Pradip Songara1
1Rothamsted Research, West Common, Harpenden AL5 2JQ, UK.
Current biology : CB
|November 14, 2025
概括
衰退的树和相关细菌中的挥发性有机化合物 (VOC) 吸引了Agrilus biguttatus虫. 这些挥发性有机物引导雌甲虫到合适的产卵地点,有助于急性树衰退 (AOD) 的传播.
科学领域:
- 生态生态学 生态生态学
- 森林病理学 森林病理学
- 化学生态化学生态学
背景情况:
- 急性树衰退 (AOD) 是英国一个重要的森林健康问题,涉及树,细菌和甲虫Agrilus biguttatus.
- 挥发性有机化合物 (VOC) 在类似的树 - 主体 - 病原体 - 昆虫系统中介导相互作用,但它们在AOD中的作用尚不清楚.
研究的目的:
- 研究VOCs在衰退的树,相关细菌和甲虫Agrilus biguttatus之间的相互作用中介作用.
- 为了确定下降的树木和细菌的VOC是否会吸引A. biguttatus.
主要方法:
- 对从衰落与无症状树叶中排放的VOC进行比较分析.
- 使用处女和怀孕的雌性A. biguttatus甲虫暴露于来自树叶和细菌培养的VOC的嗅觉测试.
- 从AOD相关的细菌 (Brenneria goodwinii,Gibbsiella quercinecans,Rahnella victoriana) 和树皮中识别和现场确认VOCs.
主要成果:
- 与健康的树相比,衰落的树叶会排放出明显的VOC.
- 雌性A. biguttatus更喜欢衰落的树叶的气味.
- 来自AOD相关细菌的VOC,特别是B. goodwinii,吸引孕妇甲虫,树皮VOC的吸引力更强.
- 三种细菌VOC被确定为吸引剂,其中两种是B. goodwinii的新型天然产品.
结论:
- 来自衰退的树和相关细菌的VOCs作为Agrilus biguttatus的关键嗅觉线索.
- 这些挥发性有机化合物引导孕妇到宿主树上合适的产卵地点,影响AOD动态.
- 成人A. biguttatus很可能利用叶子和细菌的挥发性信号来寻找宿主和繁殖.
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