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タイトル: | Herbivore-Mediated Interaction Promotes the Maintenance of Trichome Dimorphism through Negative Frequency-Dependent Selection |
著者: | Sato, Yasuhiro Kudoh, Hiroshi |
著者名の別形: | 佐藤, 安弘 工藤, 洋 |
キーワード: | Arabidopsis halleri apparent competition frequency dependence genetic variation herbivory plant defense |
発行日: | Sep-2017 |
出版者: | University of Chicago Press |
誌名: | The American Naturalist |
巻: | 190 |
号: | 3 |
開始ページ: | E68 |
終了ページ: | E77 |
抄録: | 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 of Arabidopsis halleri subsp. gemmifera. First, in a natural population where the specialist leaf beetle Phaedon brassicae was 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 of P. 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. |
著作権等: | © 2017 by The University of Chicago. The full-text file will be made open to the public on 01 September 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. |
URI: | http://hdl.handle.net/2433/226924 |
DOI(出版社版): | 10.1086/692603 |
PubMed ID: | 28829638 |
出現コレクション: | 学術雑誌掲載論文等 |
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