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WRKY transcription factors play significant roles in plant stress responses. In this study, a class III  WRKY  gene  ScWRKY5 , was successfully isolated from sugarcane variety ROC22. The ScWRKY5 was a nucleus protein with transcriptional activation activity. The  ScWRKY5  gene was constitutively expressed in all the sugarcane tissues, with the highest expression level in the stem epidermis and the lowest in the root. After inoculation with  Sporisorium scitamineum  for 1 d, the expression level of  ScWRKY5  was significantly increased in two smut-resistant varieties (YZ01-1413 and LC05-136), while it was decreased in three smut-susceptible varieties (ROC22, YZ03-103, and FN40). Besides, the expression level of  ScWRKY5  was increased by the plant hormones salicylic acid (SA) and abscisic acid (ABA), as well as the abiotic factors polyethylene glycol (PEG) and sodium chloride (NaCl). Transient overexpression of the  ScWRKY5  gene enhanced the resistance of  Nicotiana benthamiana  to the tobacco bacterial pathogen  Ralstonia solanacearum , however the transiently overexpressed  N. benthamiana  was more sensitive to the tobacco fungal pathogen  Fusarium solani  var.  coeruleum.  These results provide a reference for further research on the resistance function of sugarcane  WRKY  genes.

A class III WRKY transcription factor in sugarcane was involved in biotic and abiotic stress responses