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The  WRKY  gene family plays a vital role in plant development and environment response. Although previous studies suggested that the  WRKY  genes in carrot (Kuroda type) involved in biotic and abiotic stress responses, the information of  WRKY  genes in the latest version of the carrot genome ( Daucus carota  v2.0, Nantes type carrot) and their response to hormone and injury stresses have not been reported. In this study, we performed a genome-wide analysis of  WRKY s using a chromosome-scale genome assembly of carrot ( Daucus carota  subsp.  sativus  L.). We identified a total of 67  WRKY  genes, which were further classified into the three groups. These  WRKY  genes are unevenly distributed on carrot chromosomes. We found that more than half of them were derived from whole-genome duplication (WGD) events, suggesting that WGDs have played a major role during the evolution of the  WRKY  gene family. We experimentally ascertained the expression divergence existed between WGD-derived  WRKY  duplicated gene pairs, which is indicative of functional differentiation between duplicated genes. Our analysis of  cis -acting elements indicated that  WRKY  genes were transcriptionally regulated upon hormone and mechanic injury stresses. Gene expression analyses by qRT-PCR further presented that  WRKY  genes were involved in hormone and mechanic injury stresses.

Genome-Wide Analysis of WRKY Genes and Their Response to Hormone and Mechanic Stresses in Carrot