Herbivore-Mediated Interaction Promotes the Maintenance of Trichome Dimorphism through Negative Frequency-Dependent Selection
Herbivore-Mediated Interaction Promotes the Maintenance of Trichome Dimorphism through Negative Frequency-Dependent Selection
复制标题
草食动物介导的相互作用通过负频率依赖性选择促进毛状体二态性的维持
DOI：
10.1086/692603
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Kudoh H
中科院分区：
文献类型：
--
作者：
Sato Y;Kudoh H
天然植物种群在对食草动物的防御性状上表现出遗传变异。尽管越来越多的证据表明植食性介导的选择对植物防御，我们仍然知道很少的遗传变异如何持续在抗植食性防御性状。在这里，我们提出的领域和实验证据，草食动物介导的频率依赖性选择，促进维护的毛状体生产（毛）和毛状体（无毛）植物ofArabidopsis hallerisubsp.gemmifera。首先，在一个自然种群中，专家叶甲虫Phaedon brassicae是普遍的，有毛的植物受到损害较少时，相邻的无毛植物的频率增加。此外，两种植物形态的频率的时间变化表明，罕见的变形增加的频率在1米直径的补丁之间的调查年的规模。使用围隔实验，我们证明了一个罕见的变形优势防御（叶损伤和食草动物的丰度）和繁殖（花和克隆生产）之间的有毛和无毛植物在P的存在。芸苔属。然而，这种罕见的变形优势没有检测到甲虫缺席时，无毛植物比多毛植物在这些条件下，无论频率条件下繁殖。这些发现突出了被忽视的，但潜在的关键作用，草食动物介导的明显的相互作用，在维持植物防御多态性。
Natural plant populations exhibit genetic variation in defense traits against herbivores. Despite a growing body of evidence for herbivore-mediated selection on plant defenses, we still know little about how genetic variation persists in antiherbivore defense traits. Here we present field and experimental evidence for herbivore-mediated frequency-dependent selection that promotes the maintenance of trichome-producing (hairy) and trichomeless (glabrous) plants ofArabidopsis hallerisubsp.gemmifera. First, in a natural population where the specialist leaf beetlePhaedon brassicaewas prevalent, hairy plants were damaged less when the frequency of neighboring glabrous plants increased. Furthermore, temporal variation in the frequency of the two plant morphs showed that rarer morphs increased in frequency at the scale of 1-m-diameter patches between survey years. Using a mesocosm experiment, we demonstrated a rare-morph advantage for defense (leaf damage and herbivore abundance) and reproduction (flower and clone production) between hairy and glabrous plants in the presence ofP. brassicae. However, this rare-morph advantage was not detected when beetles were absent, with glabrous plants having higher reproduction than hairy plants under these conditions regardless of frequency conditions. These findings highlight the overlooked but potentially critical role of herbivore-mediated apparent interaction in maintaining plant defense polymorphism.