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Background  The TGACG-binding (TGA) family has 10 members that play vital roles in  Arabidopsis thaliana  defense responses and development. However, their involvement in controlling flowering time remains largely unknown and requires further investigation.    Results  To study the role of  TGA7  during floral transition, we first investigated the  tga7  mutant, which displayed a delayed-flowering phenotype under both long-day and short-day conditions. We then performed a flowering genetic pathway analysis and found that both autonomous and thermosensory pathways may affect  TGA7  expression. Furthermore, to reveal the differential gene expression profiles between wild-type (WT) and  tga7 , cDNA libraries were generated for WT and  tga7  mutant seedlings at 9 days after germination. For each library, deep-sequencing produced approximately 6.67 Gb of high-quality sequences, with the majority (84.55 %) of mRNAs being between 500 and 3,000 nt. In total, 325 differentially expressed genes were identified between WT and  tga7  mutant seedlings. Among them, four genes were associated with flowering time control. The differential expression of these four flowering-related genes was further validated by qRT-PCR.    Conclusions  Among these four differentially expressed genes associated with flowering time control,  FLC  and  MAF5  may be mainly responsible for the delayed-flowering phenotype in  tga7 , as  TGA7  expression was regulated by autonomous pathway genes. These results provide a framework for further studying the role of  TGA7  in promoting flowering.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12870-021-03144-w.

Characterization of genes associated with TGA7 during the floral transition