Differential phenotypic and genetic expression of defence compounds in a plant-herbivore interaction along elevation.

Détails

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_9989493A8966
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Differential phenotypic and genetic expression of defence compounds in a plant-herbivore interaction along elevation.
Périodique
Royal Society Open Science
Auteur(s)
Salgado A.L., Suchan T., Pellissier L., Rasmann S., Ducrest A.L., Alvarez N.
ISSN
2054-5703
ISSN-L
2054-5703
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
3
Numéro
9
Pages
160226
Langue
anglais
Résumé
Elevation gradients impose large differences in abiotic and biotic conditions over short distances, in turn, likely driving differences in gene expression more than would genetic variation per se, as natural selection and drift are less likely to fix alleles at such a narrow spatial scale. As elevation increases, the pressure exerted on plants by herbivores and on arthropod herbivores by predators decreases, and organisms spanning the elevation gradient are thus expected to show lower levels of defence at high elevation. The alternative hypothesis, based on the optimal defence theory, is that defence allocation should be higher in low-resource habitats such as those at high elevation, due to higher costs associated with tissue replacement. In this study, we analyse variation with elevation in (i) defence compound content in the plant Lotus corniculatus and (ii) gene expression associated with defence against predators in the specific phytophagous moth, Zygaena filipendulae. Both species produce cyanogenic glycosides (CNglcs) such as lotaustralin and linamarin as defence mechanisms, with the moth, in addition, being able to sequester CNglcs from its host plant. Specifically, we tested the assumption that the defence-associated phenotype in plants and the gene expression in the insect herbivore should covary between low- and high-elevation environments. We found that L. corniculatus accumulated more CNglcs at high elevation, a result in agreement with the optimal defence theory. By contrast, we found that the levels of expression in the defence genes of Z. filipendulae larvae were not related to the CNglc content of their host plant. Overall, expression levels were not correlated with elevation either, with the exception of the UGT33A1 gene, which showed a marginally significant trend towards higher expression at high elevation when using a simple statistical framework. These results suggest that the defence phenotype of plants against herbivores, and subsequent herbivore sequestration machineries and de novo production, are based on a complex network of interactions.

Mots-clé
Adult, Age Factors, Aged, Basilar Artery, Brain Stem, Cerebrovascular Disorders/complications, Cerebrovascular Disorders/diagnosis, Cerebrovascular Disorders/etiology, Cerebrovascular Disorders/mortality, Female, Germany, West, Hemiplegia/etiology, Humans, Hypertension/complications, Male, Middle Aged, Retrospective Studies, Unconsciousness/etiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
11/10/2016 16:18
Dernière modification de la notice
20/08/2019 15:01
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