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NAC transcriptional factors constitute a large family in rice and some of them have been demonstrated to play crucial roles in rice immunity. The present study investigated the function and mechanism of  ONAC066  in rice immunity. ONAC066 shows transcription activator activity that depends on its C-terminal region in rice cells.  ONAC066 -OE plants exhibited enhanced resistance while  ONAC066 -Ri and  onac066-1  plants showed attenuated resistance to  Magnaporthe oryzae . A total of 81 genes were found to be up-regulated in  ONAC066 -OE plants, and 26 of them were predicted to be induced by  M. oryzae . Four  OsWRKY  genes, including  OsWRKY45  and  OsWRKY62 , were up-regulated in  ONAC066 -OE plants but down-regulated in  ONAC066 -Ri plants. ONAC066 bound to NAC core-binding site in  OsWRKY62  promoter and activated  OsWRKY62  expression, indicating that  OsWRKY62  is a ONAC066 target. A set of cytochrome P450 genes were found to be co-expressed with  ONAC066  and 5 of them were up-regulated in  ONAC066 -OE plants but down-regulated in  ONAC066 -Ri plants. ONAC066 bound to promoters of cytochrome P450 genes  LOC_Os02g30110 ,  LOC_Os06g37300 , and  LOC_Os02g36150  and activated their transcription, indicating that these three cytochrome P450 genes are ONAC066 targets. These results suggest that ONAC066, as a transcription activator, positively contributes to rice immunity through modulating the expression of  OsWRKY62  and a set of cytochrome P450 genes to activate defense response.

frontiers in plant science

ONAC066, A Stress-Responsive NAC Transcription Activator, Positively Contributes to Rice Immunity Against Magnaprothe oryzae Through Modulating Expression of OsWRKY62 and Three Cytochrome P450 Genes