Abstract
Key message
This is the first time to dissect the mechanism of NACs-mediated disease resistance in plants using metabolomic approach and discover the involvement of ABA signaling pathway in NACs-mediated disease resistance.
Abstract
NAC transcription factors have been validated as important regulators in stress responses, but their molecular mechanisms in plant disease resistance are still largely unknown. Here we report that the NAC gene ONAC066 (LOC_Os01g09550) is significantly activated by rice blast infection. ONAC066 is ubiquitously expressed and this protein is localized in the nucleus. Overexpression of ONAC066 quantitatively enhances resistance to blast disease and bacterial blight in rice. The transcript levels of PR genes are also dramatically induced in ONAC066 overexpressing plants. Exogenous abscisic acid (ABA) strongly activates the transcription of ONAC066 in rice. Further analysis shows that overexpression of ONAC066 remarkably suppresses the expression of ABA-related genes, whereas there are no obvious differences for salicylic acid (SA) and jasmonic acid (JA)-related genes between wild-type and ONAC066 overexpressing plants. Consistently, lower endogenous ABA levels are identified in ONAC066 overexpressing plants compared with wild-type plants before and after blast inoculation, while no significant differences are observed for the SA and JA levels. Yeast one-hybrid assays demonstrate that ONAC066 directly binds to the promoters of LIP9 and NCED4 to modulate their expression. Moreover, the metabolomic study reveals that the ONAC066 overexpressing plants accumulated higher contents of soluble sugars and amino acids both before and after pathogen attack, when compared to wild-type plants. Taken together, our results suggest that ONAC066 positively regulates rice resistance to blast and bacterial blight, and ONAC066 exerts its functions on disease resistance by modulating of ABA signaling pathway, sugars and amino acids accumulation in rice.
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Acknowledgements
This research was supported partially by the NSFC-IRRI Project (31461143019), Science and Technology Projects of Guangdong Province (2015B020231002, 2016A050502030 and 2014B070706013), the Natural Science Foundation of Guangdong Province (2014A030310489), and the Common Technical Innovation Team of Guangdong Province on Agricultural Seed Industry (2017LM2148).
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QL conducted the quantitative qRT-PCR assay, transgenic functional confirmation and chemical treatment experiments, drafting the manuscript and proposal writing. SY conducted the metabolic study, drafting the manuscript and proposal writing. WH performed the quantification of endogenous ABA. JY evaluated the blast and Xoo resistance. JD, SZ, JZ, TY and XM participated in RNA extraction and quantitative qRT-PCR assays. XZ and BL conceived of the study, drafted proposal and corrected manuscript.
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Liu, Q., Yan, S., Huang, W. et al. NAC transcription factor ONAC066 positively regulates disease resistance by suppressing the ABA signaling pathway in rice. Plant Mol Biol 98, 289–302 (2018). https://doi.org/10.1007/s11103-018-0768-z
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DOI: https://doi.org/10.1007/s11103-018-0768-z