Abstract
NAC (NAM/ATAF/CUC) transcription factors have important functions in regulating plant growth, development, and abiotic and biotic stress responses. Here, we characterized two rice pathogen-responsive NAC transcription factors, ONAC122 and ONAC131. We determined that these proteins localized to the nucleus when expressed ectopically and had transcriptional activation activities. ONAC122 and ONAC131 expression was induced after infection by Magnaporthe grisea, the causal agent of rice blast disease, and the M. grisea-induced expression of both genes was faster and higher in the incompatible interaction compared with the compatible interaction during early stages of infection. ONAC122 and ONAC131 were also induced by treatment with salicylic acid, methyl jasmonate or 1-aminocyclopropane-1-carboxylic acid (a precursor of ethylene). Silencing ONAC122 or ONAC131 expression using a newly modified Brome mosaic virus (BMV)-based silencing vector resulted in an enhanced susceptibility to M. grisea. Furthermore, expression levels of several other defense- and signaling-related genes (i.e. OsLOX, OsPR1a, OsWRKY45 and OsNH1) were down-regulated in plants silenced for ONAC122 or ONAC131 expression via the BMV-based silencing system. Our results suggest that both ONAC122 and ONAC131 have important roles in rice disease resistance responses through the regulated expression of other defense- and signaling-related genes.
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This work was supported by the National Science Foundation of China (No. 30971880), the National High-tech R&D Program of China (No. 2012AA101504), the National Transgenic Major Project of China (No. 2011ZX08009-003-001), Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (No. IRT0943) and the Samuel Roberts Noble Foundation.
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Sun, L., Zhang, H., Li, D. et al. Functions of rice NAC transcriptional factors, ONAC122 and ONAC131, in defense responses against Magnaporthe grisea . Plant Mol Biol 81, 41–56 (2013). https://doi.org/10.1007/s11103-012-9981-3
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DOI: https://doi.org/10.1007/s11103-012-9981-3