AtWRKY22 Promotes Susceptibility to Aphids and Modulates Salicylic Acid and Jasmonic Acid Signalling

Overview

Journal J Exp Bot

Publisher Oxford University Press

Specialty Biology

Date 2016 Apr 24

PMID 27107291

Citations 61

Authors

Karen J Kloth

Gerrie L Wiegers

Jacqueline Busscher-Lange

Jan C van Haarst

Willem Kruijer

Harro J Bouwmeester

Marcel Dicke

Maarten A Jongsma

Affiliations

Soon will be listed here.

Abstract

Aphids induce many transcriptional perturbations in their host plants, but the signalling cascades responsible and the effects on plant resistance are largely unknown. Through a genome-wide association (GWA) mapping study in Arabidopsis thaliana, we identified WRKY22 as a candidate gene associated with feeding behaviour of the green peach aphid, Myzus persicae The transcription factor WRKY22 is known to be involved in pathogen-triggered immunity, and WRKY22 gene expression has been shown to be induced by aphids. Assessment of aphid population development and feeding behaviour on knockout mutants and overexpression lines showed that WRKY22 increases susceptibility to M. persicae via a mesophyll-located mechanism. mRNA sequencing analysis of aphid-infested wrky22 knockout plants revealed the up-regulation of genes involved in salicylic acid (SA) signalling and down-regulation of genes involved in plant growth and cell-wall loosening. In addition, mechanostimulation of knockout plants by clip cages up-regulated jasmonic acid (JA)-responsive genes, resulting in substantial negative JA-SA crosstalk. Based on this and previous studies, WRKY22 is considered to modulate the interplay between the SA and JA pathways in response to a wide range of biotic and abiotic stimuli. Its induction by aphids and its role in suppressing SA and JA signalling make WRKY22 a potential target for aphids to manipulate host plant defences.

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