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Induction of aphid resistance in tobacco by the cucumber mosaic virus CMV∆2b mutant is jasmonate‐dependent

Published version
Peer-reviewed

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Authors

Arinaitwe, Warren 
Tungadi, Trisna D. 
Pate, Adrienne E. 
Joyce, Joshua 
Baek, Eseul 

Abstract

Cucumber mosaic virus (CMV) is vectored by aphids, including Myzus persicae. Tobacco (Nicotiana tabacum ‘Xanthi’) plants infected with a mutant of the Fny strain of CMV (Fny‐CMVΔ2b, which cannot express the CMV 2b protein) exhibit strong resistance against M. persicae, which is manifested by decreased survival and reproduction of aphids confined on the plants. Previously, we found that the Fny‐CMV 1a replication protein elicits aphid resistance in plants infected with Fny‐CMVΔ2b, whereas in plants infected with wild‐type Fny‐CMV this is counteracted by the CMV 2b protein, a counterdefence protein that, among other things, inhibits jasmonic acid (JA)‐dependent immune signalling. We noted that in nontransformed cv. Petit Havana SR1 tobacco plants aphid resistance was not induced by Fny‐CMVΔ2b, suggesting that not all tobacco varieties possess the factor(s) with which the 1a protein interacts. To determine if 1a protein‐induced aphid resistance is JA‐dependent in Xanthi tobacco, transgenic plants were made that expressed an RNA silencing construct to diminish expression of the JA co‐receptor CORONATINE‐INSENSITIVE 1. Fny‐CMVΔ2b did not induce resistance to M. persicae in these transgenic plants. Thus, aphid resistance induction by the 1a protein requires JA‐dependent defensive signalling, which is countered by the CMV 2b protein.

Description

Funder: Cambridge Africa Studentship


Funder: Cambridge Department of Plant Sciences Frank Smart Studentship


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


Funder: National Research Foundation of Korea; Id: http://dx.doi.org/10.13039/501100003725


Funder: Gatsby Summer Undergraduate Bursary

Keywords

SHORT COMMUNICATION, COI1, green peach aphid, insect vector, nonpersistent transmission, viral suppressor of RNA silencing

Journal Title

Molecular Plant Pathology

Conference Name

Journal ISSN

1464-6722
1364-3703

Volume Title

Publisher

Sponsorship
Leverhulme Trust (F/09741/F, RPG‐2012‐667)
UK Biotechnological and Biological Sciences Research Council (BB/R005397/1, BB/W510609/1, BB/P023223/1, BB/J011762/1)