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在棉花广场上的棉花跳草食诱导植物挥发性排放,驱逐同类物种
Malek A Alwedyan1,2, Anjel M Helms3, John M Grunseich3
1Department of Entomology, Texas A&M University, College Station, TX, USA. malek84@tamu.edu.
Journal of chemical ecology
|May 24, 2025
概括
棉花跳会改变植物挥发性有机化合物 (VOC) 的排放. 跳避开受损的棉花方块,更喜欢未受损的,这表明VOC可以控制这种害虫.
科学领域:
- 农业昆虫学 农业昆虫学
- 化学生态化学生态学
- 植物与昆虫的相互作用
背景情况:
- 棉花跳 (Pseudatomoscelis seriatus) 通过方形脱落,导致高地棉花 (Gossypium hirsutum) 显著的产量损失.
- 目前的害虫防治严重依赖农药,促使对可持续综合害虫管理 (IPM) 策略的研究.
- 植物衍生的挥发性有机化合物 (VOC) 在介导昆虫食和宿主植物选择方面发挥着至关重要的作用.
研究的目的:
- 为了调查棉花跳虫草食如何影响棉花方块的VOC排放.
- 为了确定棉跳对这些草食动物诱导的VOCs的行为反应.
- 确定针对棉跳的IPM策略潜在的基于VOC的工具.
主要方法:
- 动态头部空间采样用于收集和分析从受损和未受损的棉花方块中发出的VOC.
- 进行了双选择嗅计测定,以评估成年棉跳对不同VOC混合物的行为反应.
- 包括 (E) -β-ocimene和 (E) -β-caryophyllene在内的合成VOC被测试了它们的吸引力或排斥力.
主要成果:
- 从棉花方块中确定了7种挥发性有机物,在跳损伤后, (E) -β-ocimene, (E) -β-caryophyllene和 (E) -β-farnesene的大量排放.
- 与对照方块相比,由食草动物损坏的方块的VOC总排放量明显高于控制方块.
- 棉花跳对未受损的方块中的VOCs表现出偏好,并被 (E) -β-ocimene吸引,但被 (E) -β-caryophyllene排斥.
结论:
- 棉花跳的草食改变了棉花方块的挥发性化学特征.
- 特定的VOC,如 (E) -β-ocimene和 (E) -β-caryophyllene,影响棉花跳的行为,作为吸引剂或驱逐剂.
- 这些已识别的化合物有望开发新的诱或驱虫剂,用于棉跳的综合性害虫防治.
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