Plant and Cell Physiology, 2004, Vol. 45, No. 6 803-809
© 2004 Oxford University Press
Short Communication |
Antagonistic Interactions between the SA and JA Signaling Pathways in Arabidopsis Modulate Expression of Defense Genes and Gene-for-Gene Resistance to Cucumber Mosaic Virus
1 Department of Life Science, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
2 Department of Biological Resource Sciences, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
3 Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 Japan
4 Division of Biology and the Molecular, Cellular and Developmental Biology Program, Kansas State University, 303 Ackert Hall, Manhattan, KS 66506-4901, U.S.A.
Abstract
Gene-for-gene resistance to a yellow strain of cucumber mosaic virus [CMV(Y)] is conferred by the dominant RESISTANCE to CMV(Y) (RCY1) allele in the Arabidopsis thaliana ecotype C24. RCY1-conferred resistance to CMV(Y) and expression of the Pathogenesis-related 1 (PR-1) and PR-5 genes are partially compromised by the eds5 mutation and the nahG transgene that block accumulation of salicylic acid (SA). In contrast, the RCY1-conferred resistance to CMV(Y) is not affected by the jasmonic acid (JA)-insensitive coi1 and jar1 mutations. Interestingly, we report here that in contrast to the eds5 RCY1 plant, the eds5 coi1 RCY1 double-mutant plant exhibited a higher level of resistance to CMV(Y). Presence of the coi1 mutant allele also restored the CMV(Y)-activated expression of the PR-1 and PR-5 gene in the eds5 coi1 RCY1 plant. In contrast to the PR-1 and PR-5 genes, expression of the JA-dependent PLANT DEFENSIN 1.2 (PDF1.2) and HEVEIN-LIKE PROTEIN (HEL) genes was elevated in the CMV(Y)-inoculated leaves of the eds5 RCY1 plant, but not in the virus-inoculated leaves of the wild-type RCY1 and coi1 RCY1 plants. We propose that antagonistic interactions between the SA and JA signaling mechanisms modulate defense gene expression and the activation of RCY1-conferred gene-for-gene resistance to CMV(Y).
Footnotes
5 Corresponding author: Email, takahash{at}bios.tohoku.ac.jp; Fax, +81-22-717-8659.
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