Implementing an evolutionary framework for understanding genetic relationships of phenotypically defined insect biotypes in the invasive soybean aphid (Aphis glycines)

Adaptive evolution of pest insects in response to the introduction of resistant cultivars is well documented and commonly results in virulent (i.e. capable of feeding upon resistant cultivars) insect populations being labeled as distinct biotypes. Phenotypically defined, biotypes frequently remain evolutionarily indistinct, resulting in ineffective application of virulence control measures and shorter durability of resistant cultivars. Here we utilize an evolutionary framework to discern the genetic relationship between biotypes of the soybean aphid (Aphis glycines, Matsumura). The soybean aphid is invasive in North America, and is among the most destructive pests of commercial soybean on the continent. Attempts to breed host-plant resistant soybean have been hampered by the emergence of virulent aphid biotypes that are unaffected by the plant’s resistance mechanism(s). Comparative population genetic analysis of virulent and avirulent (i.e. unable to feed on resistant cultivars) biotype...

害虫因抗虫品种的推广而发生适应性进化的现象已有充分文献记载，该过程通常会使携带毒力（即能够取食抗虫品种）的昆虫种群被界定为独特的生物型(biotype)。基于表型定义的生物型往往在进化层面难以区分，这会导致毒力防控措施应用失效，并缩短抗虫品种的持效性。本研究借助进化框架解析大豆蚜(Aphis glycines, Matsumura)不同生物型间的遗传关系。大豆蚜是北美入侵性害虫，也是该区域商业大豆生产中最具破坏性的害虫之一。此前培育寄主抗虫大豆的尝试均因携带毒力的蚜虫生物型的出现而受阻，这类蚜虫可规避大豆的抗性机制。本研究对具有毒力与无毒力（即无法取食抗虫品种）的蚜虫生物型开展群体比较遗传分析……