Variation in host usage among geographic populations of Leptinotarsa decemlineata, the Colorado potato beetle
Variation in host usage among geographic populations of Leptinotarsa decemlineata, the Colorado potato beetle
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DOI：
10.1007/s10340-014-0578-2
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发表时间：
2014-12-01
影响因子：
4.8
通讯作者：
Chen, Yolanda H.
中科院分区：
文献类型：
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作者：
Izzo, Victor M.;Mercer, Nathan;Chen, Yolanda H.
食草昆虫如果能够在广泛种植的农业寄主植物上进行寄主扩展，就可以成为广泛的入侵者。一个重要但尚未解决的问题是，是否所有的草食动物种群都同样能够利用新的寄主植物，或者种群是否可以在地理上结构化，即只有一个子集有可能经历寄主范围的扩张，并成为广泛的入侵。我们研究了L. decemlineata或科罗拉多马铃薯甲虫，在野生（刺茄）和栽培（马铃薯）寄主植物上的寄主偏好和表现各不相同。从六个不同的北美地区（3个祖先和2个衍生）采样，我们进行了两个全因子实验，以测试在主机的偏好，接受和性能的差异。rostraum和S.马铃薯我们的研究结果揭示了新的发展（栽培）主机协会内的害虫种群的L。在地理扩张之后的十月。害虫甲虫（即，Vermont种群）对寄主植物的区分程度较低，在两种寄主上的生长速度都快于其他种群。佛蒙特甲虫在叶子上的发育速度也比其他种群快。佛蒙特州甲虫对所有宿主类型的更大的一般偏好，接受和表现强调了甲虫的害虫形式的毒力，并可能有助于解释L. decemlineata。
Insect herbivores can become extensive invaders if they are able to undergo host expansions onto widely-grown agricultural host plants. An important yet unresolved question is whether all herbivore populations are equally able to utilize new host plants or if populations may be geographically structured, that is only a subset has the potential to undergo a host range expansion and become widely invasive. We examined if derived and ancestral geographic populations of L. decemlineata or Colorado potato beetle, varied in host preference and performance on both wild (Solanum rostratum) and cultivated (Solanum tuberosum) host plants. Sampling from six different North American regions (3 ancestral and 2 derived), we performed two full-factorial experiments to test for differences in host preference, acceptance, and performance on S. rostraum and S. tuberosum. Our results reveal the development of new (cultivated) host associations within pest populations of L. decemlineata following its geographic expansion. Pest beetles (i.e., Vermont populations) discriminated less between host plants and grew faster than all other beetle population on both host species. The Vermont beetles also developed faster on leaves than all other populations. The greater general preference, acceptance, and performance of Vermont beetles on all host types underscores the virulence of the pest form of the beetle and may help to explain the absence of pest incidence within the ancestral regions of L. decemlineata.