Mutualism has its limits: consequences of asymmetric interactions between a well-defended plant and its herbivorous pollinator
Mutualism has its limits: consequences of asymmetric interactions between a well-defended plant and its herbivorous pollinator
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DOI：
10.1098/rstb.2021.0166
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发表时间：
2022-06-20
影响因子：
6.3
通讯作者：
Raguso, Robert A.
中科院分区：
文献类型：
--
作者：
Balbuena, Maria Sol;Broadhead, Geoffrey T.;Raguso, Robert A.
对传粉者健康的关注往往集中在群居蜜蜂及其农业重要性上，而损害了其他传粉者及其生态系统服务。当授粉的食草动物使用相同的植物作为蜜源和幼虫宿主时，双方都会出现生态冲突，因为传粉者的服务被草食动物减轻，其幼虫受到植物防御的伤害。我们跟踪了传粉者健康的个体水平的指标-生长、存活率、繁殖力-跨越传粉的草食动物，常见的鹰蛾，Hyles lineata，与一种稀有植物月见草相互作用，这种植物对常见的花挥发性(R)-(-)-芳樟醇是多态的。芳樟醇对引花没有影响，但其实验添加抑制了对缺乏芳樟醇的植物的产卵。由于幼虫生长和存活不良，植物对草食性疾病表现出从叶盘到全株鳞片的强大抗性。幼虫对月见草目其他物种的较高表现表明，三尖瓣月见草虫对食草动物的结构性抗性并不是一个全属的特征。不同种群的三尖杉叶片挥发物不同，但不受幼虫食草性的诱导。同样，弹力单宁和其他酚类物质在不同的植物组织中也不同，但不是由食草动物诱导的。我们的发现突出了植物-传粉者的不对称相互作用以及包括替代幼虫寄主植物在内的第三方在维持传粉者健康方面的重要性。这篇文章是主题期刊《影响传粉者健康的自然过程：从化学到景观》的一部分。
Concern for pollinator health often focuses on social bees and their agricultural importance at the expense of other pollinators and their ecosystem services. When pollinating herbivores use the same plants as nectar sources and larval hosts, ecological conflicts emerge for both parties, as the pollinator's services are mitigated by herbivory and its larvae are harmed by plant defences. We tracked individual-level metrics of pollinator health-growth, survivorship, fecundity-across the life cycle of a pollinating herbivore, the common hawkmoth, Hyles lineata, interacting with a rare plant, Oenothera harringtonii, that is polymorphic for the common floral volatile (R)-(-)-linalool. Linalool had no impact on floral attraction, but its experimental addition suppressed oviposition on plants lacking linalool. Plants showed robust resistance against herbivory from leaf-disc to whole-plant scales, through poor larval growth and survivorship. Higher larval performance on other Oenothera species indicates that constitutive herbivore resistance by O. harringtonii is not a genus-wide trait. Leaf volatiles differed among populations of O. harringtonii but were not induced by larval herbivory. Similarly, elagitannins and other phenolics varied among plant tissues but were not herbivore-induced. Our findings highlight asymmetric plant-pollinator interactions and the importance of third parties, including alternative larval host plants, in maintaining pollinator health.This article is part of the theme issue 'Natural processes influencing pollinator health: from chemistry to landscapes'.