Infection of Arabidopsis by cucumber mosaic virus triggers jasmonateādependent resistance to aphids that relies partly on the patternātriggered immunity factor BAK1
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Abstract: Many aphidāvectored 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 aphidātransmitted 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 CMVāinfected plants, feeding deterrence reduces their growth and reproduction. We found that CMVāinduced inhibition of growth as well as CMVāinduced inhibition of reproduction of M. persicae are dependent upon jasmonateāmediated signalling. BRASSINOSTEROID INSENSITIVE1āASSOCIATED KINASE1 (BAK1) is a coāreceptor enabling detection of microbeāassociated molecular patterns and induction of patternātriggered immunity (PTI). In plants carrying the mutant bak1ā5 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 jasmonateādependent and PTIādependent mechanism that inhibits aphid growth, and a jasmonateādependent, PTIāindependent mechanism that inhibits reproduction. The growth of two crucifer specialist aphids, Lipaphis erysimi and Brevicoryne brassicae, was not affected when confined on CMVāinfected A. thaliana. However, B. brassicae reproduction was inhibited on CMVāinfected plants. This suggests that in A. thaliana CMVāinduced resistance to aphids, which is thought to incentivize virus vectoring, has greater effects on polyphagous than on crucifer specialist aphids.
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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
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1364-3703
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Biotechnology and Biological Sciences Research Council (BB/J011762/1, BB/M011194/1, BB/P023223/1)
Leverhulme Trust (F/09741/F, RPGā2012ā667)