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The study reports 147 full-length  WRKY  genes based on the transcriptome analysis of Glycyrrhiza genus ( G. glabra  and  G. uralensis ). Additional motifs in  G. glabra  included DivIVA (GgWRKY20) and SerS Superfamily (GgWRKY21) at the C-terminal, and Coat family motifs (GgWRKY55) at the N-terminal of the proteins, while Exo70 exo cyst complex subunit of 338 amino acid (GuWRKY9) was present at the N-terminal of  G. uralensis  only. Plant Zn cluster super-family domain (17 WRKYs) and bZIP domain (2 WRKYs) were common between the two species. Based on the number of WRKY domains, sequence alignment and phylogenesis, the study identified GuWRKY27 comprising of 3 WRKY domains in  G. uralensis  and a new subgroup-IIf (10 members), having novel zinc finger pattern (C-X 4 -C-X 22 -HXH) in  G. glabra . Multiple WRKY binding domains (1–11) were identified in the promoter regions of the  GgWRKY  genes indicating strong interacting network between the WRKY proteins. Tissue-specific expression of 25  GgWRKYs , under normal and treated conditions, revealed 11 of the 18 induction factor triggered response corroborating to response observed in  AtWRKYs . The study identified auxin-responsive  GgWRKY  55 &  GgWRKY 38; GA 3  responsive  GgWRKYs 15&59 in roots and  GgWRKYs 8, 20, 38, 57 &58 in the shoots of the treated plant.  GgWRKYs  induced under various stresses included  GgWRKY 33 (cold),  GgWRKY 4 (senescence),  GgWRKYs 2, 28 & 33 (salinity) and  GgWRKY 40 (wounding). Overall, 23  GgWRKYs  responded to abiotic stress, and 17  WRKYs  were induced by hormonal signals. Of them 13  WRKYs  responded to both suggesting inter-connection between hormone signalling and stress response. The present study will help in understanding the transcriptional reprogramming, protein-protein interaction and cross-regulation during stress and other physiological processes in the plant.

A Comprehensive Transcriptome-Wide Identification and Screening of WRKY Gene Family Engaged in Abiotic Stress in Glycyrrhiza glabra