Open AccessSalicylic Acid-Induced Resistance to Cucumber mosaic virus in Squash and Arabidopsis thaliana: Contrasting Mechanisms of Induction and Antiviral Action
Author(s) -
Carl Mayers,
Kian-Chung Lee,
Catherine Moore,
Sek-Man Wong,
John P. Carr
Publication year - 2005
Publication title -
molecular plant-microbe interactions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.565
H-Index - 153
eISSN - 1943-7706
pISSN - 0894-0282
DOI - 10.1094/mpmi-18-0428
Subject(s) - cucumber mosaic virus , cucumovirus , arabidopsis thaliana , biology , tobacco mosaic virus , salicylic acid , nicotiana tabacum , systemic acquired resistance , cucurbita pepo , callose , alternative oxidase , virology , virus , plant virus , hypersensitive response , microbiology and biotechnology , botany , plant disease resistance , biochemistry , mitochondrion , arabidopsis , cell wall , gene , mutant
Salicylic acid (SA)-induced resistance to Cucumber mosaic virus (CMV) in tobacco (Nicotiana tabacum) results from inhibition of systemic virus movement and is induced via a signal transduction pathway that also can be triggered by antimycin A, an inducer of the mitochondrial enzyme alternative oxidase (AOX). In Arabidopsis thaliana, inhibition of CMV systemic movement also is induced by SA and antimycin A. These results indicate that the mechanisms underlying induced resistance to CMV in tobacco and A. thaliana are very similar. In contrast to the situation in tobacco and A. thaliana, in squash (Cucurbita pepo), SA-induced resistance to CMV results from inhibited virus accumulation in directly inoculated tissue, most likely through inhibition of cell-to-cell movement. Furthermore, neither of the AOX inducers antimycin A or KCN induced resistance to CMV in squash. Additionally, AOX inhibitors that compromise SAinduced resistance to CMV in tobacco did not inhibit SAinduced resistance to the virus in squash. The results show that different host species may use significantly different approaches to resist infection by the same virus. These findings also imply that caution is required when attempting to apply findings on plant-virus interactions from model systems to a wider range of host species.