The root endophytic fungus Trichoderma atroviride induces foliar herbivory resistance in maize plants
The root endophytic fungus Trichoderma atroviride induces foliar herbivory resistance in maize plants
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DOI：
10.1016/j.apsoil.2017.10.004
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发表时间：
2018-03-01
影响因子：
4.8
通讯作者：
Larsen, John
中科院分区：
文献类型：
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作者：
Angel Contreras-Cornejo, Hexon;Macias-Rodriguez, Lourdes;Larsen, John
植物根部天然地与木霉属相关，可以促进植物健康和营养。尽管木霉菌属。是众所周知的生物防治剂，但有关其对叶面昆虫草食性的影响的信息有限。在这里，我们研究了 T. atroviride 在提供玉米 (Zea mays) 对草食性昆虫草地贪夜蛾 (Spodoptera frugiperda) 的抗性方面的作用。玉米接种深绿木霉后，观察到植物生长增加、食草性减少和昆虫摄食模式改变。植物保护与挥发性萜烯的释放增加和茉莉酸的积累相关，茉莉酸是针对草食动物的防御反应的激活剂。化学分析表明，T. atroviride 产生挥发性物质 1-octen-3-ol 和 6-pentyl-2H-pyran-2-one。药理学测试表明，这两种化合物都减少了叶组织的消耗，并以与黑绿叶霉类似的方式改变了草地贪夜蛾的摄食模式。这些结果为 T. atroviride 在植物健康中的作用提供了新的见解，即诱导对昆虫草食性的抗性和产生拒食性次级代谢产物。
Plant roots naturally associate with Trichoderma spp., which can promote plant health and nutrition. Despite that Trichoderma spp. are well-known biocontrol agents, information on their effects against foliar insect herbivory is limited. Here, we examined the effects of T. atroviride in providing maize (Zea mays) resistance against the insect herbivore Spodoptera frugiperda. Increased plant growth, reduced herbivory and altered insect feeding pattern were observed after maize inoculation with T. atroviride. Plant protection was correlated with increased emission of volatile terpenes and accumulation of jasmonic acid, an activator of defense responses against herbivory. Chemical analyses revealed that T. atroviride produced the volatiles 1-octen-3-ol and 6-pentyl-2H-pyran-2-one. Pharmacological tests showed that both compounds reduced the consumption of foliar tissue and altered the feeding pattern of S. frugiperda in a similar way to T. atroviride. These results provide new insight into the role of T. atroviride in plant health in terms of induction of resistance to insect herbivory and production of antifeedant secondary metabolites.