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Genetic variants affecting plant size and chemical defenses jointly shape herbivory in Arabidopsis

Genetic variants affecting plant size and chemical defenses jointly shape herbivory in Arabidopsis

Authors :
Simon C. Groen
Mitchell J. Feldmann
Christopher Meyer
Fabrice Roux
Andrew D. Gloss
Benjamin Brachi
LaPlante E
Jérôme Gouzy
Whiteman N
Rogan S
Joy Bergelson
Pyon H
Claudia Bartoli
Institut de Génétique, Environnement et Protection des Plantes (IGEPP)
Institut National de la Recherche Agronomique (INRA)-Université de Rennes 1 (UR1)
Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST
Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST
Source :
BioRxiv, BioRxiv, 2017, ⟨10.1101/156299⟩
Publication Year :
2017
Publisher :
HAL CCSD, 2017.

Abstract

Herbivorous insects exhibit strong feeding preferences when choosing among plant genotypes, yet experiments to map loci mediating plant susceptibility to herbivory rarely incorporate host choice. To address this gap, we applied genome-wide association (GWA) mapping to uncover genetic polymorphisms mediating damage from foraging insects (two populations ofScaptomyza flava) across a mixture ofArabidopsis thalianagenotypes in experimental enclosures. The effect of chemical defenses (glucosinolates) on herbivory depended on herbivore genotype. Unlike many studies that minimize the effects of host choice behavior, we also found a large effect of plant size on herbivory—likely through its effect on plant apparency—that was independent of herbivore genotype. These herbivory-associated loci are polymorphic at fine spatial scales, and thus have potential to shape variation in herbivory within natural populations. We also show that the polymorphism with the largest effect on herbivory underlies adaptive latitudinal variation inArabidopsisplant size across Europe. Overall, our results provide genetic support for ecological observations that variation in both chemical defenses and non-canonical defense traits (e.g., plant size and phenology) jointly shapes plant-herbivore interactions.

Details

Language :
English
Database :
OpenAIRE
Journal :
BioRxiv, BioRxiv, 2017, ⟨10.1101/156299⟩
Accession number :
edsair.doi.dedup.....c55b9bec4092c7f2508827fac507679b
Full Text :
https://doi.org/10.1101/156299⟩