Identification and Characterization of EIN3/EIL Transcription Factor Family Members in Lamb.

Transcription factors refer to types of proteins that perform significant functions in the process of gene expression regulation. The ethylene insensitive 3/ethylene insensitive 3-like () family, functioning as significant transcription factors regulating ethylene, plays a critical role in the growth and development of plants and participates in the plant's response to diverse environmental stresses. is an excellent native tree with high economic and ecological value. However, the study of genes in gymnosperms, for instance, is still relatively limited. In this research, four putative genes were identified in the transcriptome of . Bioinformatics analysis showed that genes contain a highly conserved EIN3 domain and other structural features of acidic, proline-rich and glutamine-rich sites. The molecular evolution tree analysis demonstrated that the family was partitioned into three categories (A, B, and C), and the number, type, and distribution of conserved motifs grouped in one category were similar. The results of qRT-PCR indicated that the expression levels of genes were markedly elevated in needles compared to other tissues. Through the analysis of expression patterns of the genes under various stress treatments, it was found that the genes could participate in plant hormone stimulation induction, osmosis, drought and other response processes. In addition, PmEIL is a nuclear localization protein. PmEIL1, PmEIL3, and PmEIL4 are transcriptional activators, while PmEIL2 is a transcriptional suppressor. This research provides a basis for further elucidating the function of EIN3/EIL transcription factors in growth, development and stress response of .