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Plants are continuously exposed to myriad pathogen stresses. However, the molecular mechanisms by which these stress signals are perceived and transduced are poorly understood. In this study, the maize gene  GRMZM2G315431  was identified to be highly inducible by  Rhizoctonia solani  infection, suggesting that the promoter of  GRMZM2G315431  (pGRMZM2G315431) might contain a specific  cis -acting element responsive to  R. solani  attack. To identify the  R. solani -responsive element in pGRMZM2G315431, a series of binary plant transformation vectors were constructed by fusing pGRMZM2G315431 or its deletion-derivatives with the reporter genes. In the transient gene expression system of  Nicotiana benthamiana  leaves inoculated with  R. solani , GUS quantification suggested that the DNA fragment contains the unknown pathogen-inducible  cis- elements in the −1323 to −1212 region. Furthermore, detailed quantitative assays showed that two novel  cis -elements, GTTGA in the −1243 to −1239 region and TATTT in the −1232 to −1228 region, were responsible for the  R. solani -inducible activity. These two  cis -elements were also identified to have  R. solani -specific-inducible activity in stable transgenic rice plants, suggesting the existence of a novel regulation mechanism involved in the interaction between  R. solani  and  Zea mays.

Identification of two novel Rhizoctonia solani-inducible cis-acting elements in the promoter of the maize gene, GRMZM2G315431