期刊
MOLECULAR PLANT-MICROBE INTERACTIONS
卷 25, 期 11, 页码 1459-1468出版社
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-09-11-0256
关键词
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资金
- National Research Council of Canada Plant Biotechnology Institute (NRC-PBI)
- NRC Genomics and Health Initiative
- National Science and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation
- Michael Smith Laboratories
- Chinese National Science Foundation
- NSERC
Transcriptional reprogramming during induction of salicylic acid (SA)-mediated defenses is regulated primarily by NPR1 (NONEXPRESSOR OF PATHOGENESIS-RELATED GENES I), likely through interactions with TGA bZIP transcription factors. To ascertain the contributions of clade I TGA factors (TGA1 and TGA4) to defense responses, a tga1-1 tga4-1 double mutant was constructed and challenged with Pseudomonas syringae and Hyaloperonospora. arabidopsidis. Although the mutant displayed enhanced susceptibility to virulent P. syringae, it was not compromised in systemic acquired resistance against this pathogen or resistance against avirulent H. arabidopsidis. Microarray analysis of nonelicited and SA-treated plants indicated that clade I TGA factors regulate fewer genes than NPR1. Approximately half of TGA-dependent genes were regulated by NPR1 but, in all cases, the direction of change was opposite in the two mutants. In support of the microarray data, the NPR1-independent disease resistance observed in the autoimmune resistance (R) gene mutant snc1 is partly compromised by tga1-1 tga4-1 mutations, and a triple mutant of clade I TGA factors with npr1-1 is more susceptible than either parent. These results suggest that clade I TGA factors are required for resistance against virulent pathogens and avirulent pathogens mediated by at least some R gene specificities, acting substantially through NPR1-independent pathways.
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