Specificity of herbivore-induced responses in an invasive species, Alternanthera philoxeroides (alligator weed).
Specificity of herbivore-induced responses in an invasive species, Alternanthera philoxeroides (alligator weed).
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DOI：
10.1002/ece3.3615
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发表时间：
2018-01
影响因子：
2.6
通讯作者：
Li B
中科院分区：
文献类型：
--
作者：
Liu M;Zhou F;Pan X;Zhang Z;Traw MB;Li B
植食性诱导的植物反应既可以对随后定殖的植食性动物产生负面影响，也可以减轻植食性对宿主的影响。然而，人们仍然不太清楚植物是否对专家和通才食草动物的非次生代谢物性状表现出特异性反应，以及入侵植物种群和本地植物种群对专家和通才的特异性有何不同。我们将入侵植物空心莲子草暴露于Agasicles hygrophila（鞘翅目，夜蛾科;专家），Spodoptera litura（鳞翅目，夜蛾科;通才），手动修剪或外源茉莉酸的应用，并检查了适合性性状（例如，地上生物量），形态学（例如，根：芽比率），和化学（例如，C/N比和木质素），以及对嗜湿曲霉和斜纹夜蛾后续性能的影响的特异性。然后，我们评估了入侵和本地人群（分别为美国和阿根廷）之间的特异性变化。结果表明，斜纹夜蛾的分枝强度和比叶面积均高于喜湿蒿，但C/N比低于喜湿蒿，而喜湿蒿的毛状体密度高于斜纹夜蛾。诱导对斜纹夜蛾幼虫生长的负面影响大于嗜湿夜蛾。入侵种群对斜纹夜蛾的三萜皂苷和C/N比的反应弱于对喜湿夜蛾的反应，而本地种群对这两种草食动物的反应相似。对两种食草动物取食诱导植物的具体影响在入侵种群和本地种群之间没有变化。总的来说，我们证明了在非次级代谢物性状方面对专家和通才食草动物的诱导的特异性，并且通才比专家更容易诱导。此外，特定的专家和通才食草动物的化学反应只存在于入侵种群中，与入侵种群特异性的进化变化相一致。
Herbivory‐induced responses in plants can both negatively affect subsequently colonizing herbivores and mitigate the effect of herbivory on the host. However, it is still less known whether plants exhibit specific responses to specialist and generalist herbivores in non‐secondary metabolite traits and how specificity to specialists and generalists differs between invasive and native plant populations. We exposed an invasive plant, Alternanthera philoxeroides, to Agasicles hygrophila (Coleoptera, Chrysomelidae; specialist), Spodoptera litura (Lepidoptera, Noctuidae; generalist), manual clipping, or application of exogenous jasmonic acid and examined both the specificity of elicitation in traits of fitness (e.g., aboveground biomass), morphology (e.g., root:shoot ratio), and chemistry (e.g., C/N ratio and lignin), and specificity of effect on the subsequent performance of A. hygrophila and S. litura. Then, we assessed variation of the specificity between invasive and native populations (USA and Argentina, respectively). The results showed S. litura induced higher branching intensity and specific leaf area but lower C/N ratio than A. hygrophila, whereas A. hygrophila induced higher trichome density than S. litura. The negative effect of induction on subsequent larval growth was greater for S. litura than for A. hygrophila. Invasive populations had a weaker response to S. litura than to A. hygrophila in triterpenoid saponins and C/N ratio, while native populations responded similarly to these two herbivores. The specific effect on the two herbivores feeding on induced plants did not vary between invasive and native populations. Overall, we demonstrate specificity of elicitation to specialist and generalist herbivores in non‐secondary metabolite traits, and that the generalist is more susceptible to induction than the specialist. Furthermore, chemical responses specific to specialist and generalist herbivores only exist in the invasive populations, consistent with an evolutionary change in specificity in the invasive populations.
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影响因子：
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作者：
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通讯作者：
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