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Infection of Arabidopsis by cucumber mosaic virus triggers jasmonate‐dependent resistance to aphids that relies partly on the pattern‐triggered immunity factor BAK1

Published version
Peer-reviewed

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Authors

Tungadi, Trisna 
Watt, Lewis G. 
Groen, Simon C. 
Du, Zhiyou 

Abstract

Abstract: Many aphid‐vectored viruses are transmitted nonpersistently via transient attachment of virus particles to aphid mouthparts and are most effectively acquired or transmitted during brief stylet punctures of epidermal cells. In Arabidopsis thaliana, the aphid‐transmitted virus cucumber mosaic virus (CMV) induces feeding deterrence against the polyphagous aphid Myzus persicae. This form of resistance inhibits prolonged phloem feeding but promotes virus acquisition by aphids because it encourages probing of plant epidermal cells. When aphids are confined on CMV‐infected plants, feeding deterrence reduces their growth and reproduction. We found that CMV‐induced inhibition of growth as well as CMV‐induced inhibition of reproduction of M. persicae are dependent upon jasmonate‐mediated signalling. BRASSINOSTEROID INSENSITIVE1‐ASSOCIATED KINASE1 (BAK1) is a co‐receptor enabling detection of microbe‐associated molecular patterns and induction of pattern‐triggered immunity (PTI). In plants carrying the mutant bak1‐5 allele, CMV induced inhibition of M. persicae reproduction but not inhibition of aphid growth. We conclude that in wildtype plants CMV induces two mechanisms that diminish performance of M. persicae: a jasmonate‐dependent and PTI‐dependent mechanism that inhibits aphid growth, and a jasmonate‐dependent, PTI‐independent mechanism that inhibits reproduction. The growth of two crucifer specialist aphids, Lipaphis erysimi and Brevicoryne brassicae, was not affected when confined on CMV‐infected A. thaliana. However, B. brassicae reproduction was inhibited on CMV‐infected plants. This suggests that in A. thaliana CMV‐induced resistance to aphids, which is thought to incentivize virus vectoring, has greater effects on polyphagous than on crucifer specialist aphids.

Description

Funder: Cambridge European Trust; Id: http://dx.doi.org/10.13039/501100003343


Funder: Frank Smart Fund Plant Sciences University of Cambridge


Funder: Cambridge Philosophical Society; Id: http://dx.doi.org/10.13039/100013858

Keywords

ORIGINAL ARTICLE, ORIGINAL ARTICLES, CMV 2b protein, epidemiology, ethylene, jasmonate, PAMP‐triggered immunity, salicylate

Journal Title

Molecular Plant Pathology

Conference Name

Journal ISSN

1464-6722
1364-3703

Volume Title

Publisher

Sponsorship
European Commission (PIIFGA‐2009‐236443)
Biotechnology and Biological Sciences Research Council (BB/J011762/1, BB/M011194/1, BB/P023223/1)
Leverhulme Trust (F/09741/F, RPG‐2012‐667)