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首页> 外文期刊>Journal of Chemical Ecology: Official Journal of the International Society of Chemical Ecology >Light Limitation Impacts Growth but Not Constitutive or Jasmonate Induced Defenses Relevant to Emerald Ash Borer (Agrilus planipennis) in White Fringetree (Chionanthus virginicus) or Black Ash (Fraxinus nigra)
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Light Limitation Impacts Growth but Not Constitutive or Jasmonate Induced Defenses Relevant to Emerald Ash Borer (Agrilus planipennis) in White Fringetree (Chionanthus virginicus) or Black Ash (Fraxinus nigra)

机译：光照限制影响生长，但不是组成型或jasmonate诱导的祖母绿螟（Agrilus Planipennis）在白色Fringetree（Chionanthus vionicis）或黑灰（Fraxinus nigra）中相关的祖母绿

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White fringetree is a host for the invasive emerald ash borer (EAB) but is of lower quality than the related and highly susceptible black ash. Field observations suggest that host trees grown in full sun are more resistant to EAB than those in shade, however the impact of light limitation on chemical defenses has not been assessed. We quantified constitutive and jasmonate-induced phloem defenses and growth patterns of white fringetree and black ash under differential light conditions and related them to EAB larval performance. White fringetree had significantly lower constitutive and induced activities of peroxidase, polyphenol oxidase,beta-glucosidase, chitinase and lignin content, but significantly higher gallic acid equivalent soluble phenolic, soluble sugar, and oleuropein concentrations compared to black ash. Multivariate analyses based on tissue chemical attributes displayed clear separation of species and induced defense responses. Further, EAB performed significantly worse on white fringetree than black ash, consistent with previous studies. Light limitation did not impact measured defenses or EAB larval performance, but it did decrease current year growth and increase photosynthetic efficiency. Overall our results suggest that phenolic profiles, metabolite abundance, and growth traits are important in mediating white fringetree resistance to EAB, and that short-term light limitation does not influence phloem chemistry or larval success.
机译：白穗螟是入侵性翡翠灰螟（EAB）的宿主，但其质量低于相关且高度敏感的黑灰。野外观察表明，在全日照条件下生长的寄主树比在阴凉条件下生长的寄主树对EAB的抗性更强，但光照限制对化学防御的影响尚未评估。我们量化了在不同光照条件下，由茉莉酸盐诱导的组成型韧皮部防御系统和白藜和黑灰的生长模式，并将它们与EAB幼虫的表现相关联。与黑灰相比，白花蛇舌草的过氧化物酶、多酚氧化酶、β-葡萄糖苷酶、几丁质酶和木质素含量的组成活性和诱导活性显著降低，但没食子酸当量的可溶性酚、可溶性糖和橄榄苦苷浓度显著升高。基于组织化学属性的多变量分析显示，物种之间存在明显的分离，并诱导了防御反应。此外，与之前的研究一致，EAB在白色流苏上的表现明显比黑色灰烬差。光照限制并没有影响测得的防御或EAB幼虫的表现，但它确实降低了当年的生长并提高了光合效率。总的来说，我们的研究结果表明，酚类物质、代谢物丰度和生长特性在介导白斑蝽对EAB的抗性方面很重要，短期光照限制不会影响韧皮部化学或幼虫的成功。

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