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快速适应和北美作物病虫的跨物种侵袭 Helicoverpa zeaea

Henry L North¹, Zhen Fu^2,3, Richard Metz⁴

¹Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK.

Molecular biology and evolution

|June 28, 2024

概括

玉米耳 (Helicoverpa zea) 通过来自入侵物种的基因流和对自身遗传变异的选择,迅速适应农药. 这项研究揭示了驱动害虫适应和抵抗的两个关键机制.

科学领域:

遗传学遗传学是一个
进化生物学进化生物学
农业科学农业科学

背景情况:

昆虫作物害虫,如玉米耳 (Helicoverpa zea),对全球粮食安全构成重大威胁.
害虫适应,包括抗农药性,是由种群内的遗传变异和物种之间的基因流动驱动的.
侵袭性物种Helicoverpa armigera向南美H. zea. 引入了一种对甲状腺耐药性基因 (CYP337B3).

研究的目的:

为了研究北美海力科柏种群的快速适应机制.
确定Helicoverpa armigera的基因流是否有助于北美H. zea. 的农药耐药性.
为了确定与H. zea.中的农药耐药性相关的选择的遗传特征.

主要方法:

在北美10个样本地点对237个H. zea基因组进行了测序.
对基因组数据的分析,以检测H. armigera的侵入,并确定选择的特征.
估计特定等位基因所赋予的适应性优势.

主要成果:

在北美H. zea种群中发现了Helicoverpa armigera侵入的证据,其中两个个体在CYP337B3区域携带H. armigera单元型.
在非混合的H. zea中识别了对细胞染色体P450基因CYP333B3的选择性扫描,估计该基因基因的适应性优势为~5%.
在与Bt耐药性相关的素基因中检测潜在的选择特征.

结论:

两种主要机制驱动H. zea的快速适应:介绍有益的等位基因的跨种内进化和对种内变异的选择.
来自H. armigera的自适应性内侵已经将抗农药基因引入了北美H. zea.
像CYP333B3这样的基因的内部选择也对这种害虫物种的农药耐药性进化有显著的贡献.

关键词:

这是一架直升飞机的直升机pa armigera.这是一架直升机的飞行器.Bt 电阻 Bt 的电阻这是一个内进的进攻.侵入性物种是一种入侵性物种.通过距离隔离的隔离.农药耐药性农药耐药性农药耐药性害虫害虫害害虫害害虫害害害虫害害害虫害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害害人口基因组学人口基因组学选择性的扫除选择性的扫除

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