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        Identification of the WRKY gene family in apricot and its response to drought stress

        Jing Chenjuan,Wang Duan,Liu Zhikun,Chen Xuefeng,Dong Hui,Wu Xiaohong 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.2

        The WRKY family has been found in 14 plant species, and its members are mostly involved in plant stress resistance. Apricot ( Prunus armeniaca L.) trees are extremely drought tolerant, but the molecular mechanisms have not yet been elucidated. Therefore, we investigated the WRKY gene family in apricot and analyzed the gene expression patterns in response to drought stress. A total of 56 candidate WRKY genes (PaWRKY1–56 ) were identifi ed in the apricot genome. The putative proteins contain 162–1055 amino acids, with an isoelectric point of 5.0–9.68 and molecular weight of 18.76– 114.2 Da. The PaWRKY family has a heptapeptide domain (WRKY) and zinc fi nger domain (CX 5-7 CX 22-23 HXH), which show diff erential variations among three groups. Group I has 12 members, with 2 WRKY and zinc fi nger domains located at the C and N terminus, respectively. Group II can be further divided into II-b, II-c, II-d, and II-e, with 10, 13, 6, and 7 members, respectively. Group III has eight members. Members of groups II and III have one WRKY and one zinc fi nger domain. Fifty-one PaWRKY genes are unevenly distributed across eight linkage groups. Only one tandem repeat event was detected, and gene duplication was identifi ed as the main factor driving gene evolution. A total of 28 PaWRKY genes responded to the drought–rehydration treatment. In particular, drought stress up-regulated PaWRKY11/14/48 expression and down-regulated PaWRKY23 expression. The genome-wide identifi cation, functional characterization, and evolution- ary analysis of the PaWRKY family yield new insights into the role of WRKY in the drought tolerance of apricot trees.

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