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The WRKY family of transcription factors (TFs) includes a number of transcription-specific groupings that play important roles in plant growth and development and in plant responses to various stresses. To screen for WRKY transcription factors associated with drought stress in Zanthoxylum bungeanum , a total of 38 ZbWRKY were identified and these were then classified and identified with Arabidopsis WRKY. Using bioinformatics analyses based on the structural characteristics of the conservative domain, 38 WRKY transcription factors were identified and categorized into three groups: Groups I, II, and III. Of these, Group II can be divided into four subgroups: subgroups IIb, IIc, IId, and IIe. No ZbWRKY members of subgroup IIa were found in the sequencing data. In addition, 38 ZbWRKY were identified by real-time PCR to determine the behavior of this family of genes under drought stress. Twelve ZbWRKY transcription factors were found to be significantly upregulated under drought stress and these were identified by relative quantification. As predicted by the STRING website, the results show that the WRKYs are involved in four signaling pathways-the jasmonic acid (JA), the salicylic acid (SA), the mitogen-activated protein kinase (MAPK), and the ethylene signaling pathways. ZbWRKY33 is the most intense transcription factor in response to drought stress. We predict that WRKY33 binds directly to the ethylene synthesis precursor gene ACS6 , to promote ethylene synthesis. Ethylene then binds to the ethylene activator release signal to activate a series of downstream genes for cold stress and osmotic responses. The roles of ZbWRKY transcription factors in drought stress rely on a regulatory network center on the JA signaling pathway.

Patterns of Drought Response of 38 WRKY Transcription Factors of Zanthoxylum bungeanum Maxim.