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Title: Associational effects and the maintenance of polymorphism in plant defense against herbivores: review and evidence
Authors: Sato, Yasuhiro
Author's alias: 佐藤, 安弘
Keywords: frequency‐dependent selection
genetic variation
herbivory
neighbor effects
plant defense
Issue Date: Apr-2018
Publisher: Wiley
Journal title: Plant Species Biology
Volume: 33
Issue: 2
Start page: 91
End page: 108
Abstract: Many plant species have evolved defense traits against herbivores. Associational effects (AEs) refer to a kind of apparent interaction where the herbivory risk to a focal plant species depends on the composition of other plant species in a neighborhood. Despite ample evidence for AEs between different plant species, this point of view has rarely been applied to polymorphism in defense traits within a plant species. The purpose of this review is to highlight an overlooked role of conspecific AEs in maintaining polymorphism in antiherbivore defense. First, I present a general review of AE between plant species and its role in the coexistence of plant species. This viewpoint of AE can be applied to genetic polymorphism within a plant species, as it causes frequency‐ and density‐dependent herbivory between multiple plant types. Second, I introduce a case study of conspecific AEs in the trichome‐producing (hairy) and glabrous plants of Arabidopsis halleri subsp. gemmifera. Laboratory and semi‐field experiments illustrated that AEs against the brassica leaf beetle Phaedon brassicae mediate a minority advantage in defense and fitness between hairy and glabrous plants. Combined with a statistical modeling approach, field observation revealed that conspecific AEs can maintain the trichome dimorphism via negative frequency‐dependent selection in a plant population. Finally, I discuss spatial and temporal scales at which AEs contribute to shaping genetic variation in antiherbivore defense in a plant metapopulation. Based on the review and evidence, I suggest that AEs play a key role in the maintenance of genetic variation within a plant species.
Rights: This is the peer reviewed version of the following article: Sato, Y. (2018), Associational effects and the maintenance of polymorphism in plant defense against herbivores: review and evidence. Plant Species Biology, 33: 91-108, which has been published in final form at https://doi.org/10.1111/1442-1984.12201. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
The full-text file will be made open to the public on 22 February 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/234646
DOI(Published Version): 10.1111/1442-1984.12201
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