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The ethylene (ET) signaling pathway is involved in plant immunity and contributes to the disease tolerance of plants to necrotrophic phytopathogens. Ethylene response factors (ERFs) are known to play important roles in the transcriptional regulation of defense genes by ET. In the present study, we analyzed the function of AtERF71 belonged to group VII ERF family in disease resistance against a hemibiotrophic fungal phytopathogen, Fusarium graminearum . When conidia solutions were dropped onto intact leaves of Arabidopsis plants, both ein2-1 and ein3-1 mutants showed enhanced disease resistance against F. graminearum compared with the wild type. This finding suggested that the ET signaling pathway was involved in the resistance to Fusarium entry into the leaf epidermis in Arabidopsis plants. We discovered that the AtERF71 expression was significantly induced by inoculation with F. graminearum . This induction of AtERF71 was suppressed in the ein3-1 mutant. Enhanced disease resistance was observed in the leaves of the aterf71 mutant when compared with wild type. In addition, the expression levels of the JA/ET-responsive PDF1.2 gene were significantly down-regulated in the aterf71 mutant after inoculation with F. graminearum . Taken together, these results indicate the possible involvement of AtERF71 in disease tolerance to F. graminearum in Arabidopsis plants.

The possible roles of <i>AtERF71</i> in the defense response against the <i>Fusarium graminearum</i>