Genome Identification and Evolutionary Analysis of Genes and Response to Environmental Factors in .

is nationally conserved in China due to its high economic value and positive effect on the ecological environment. has an excellent wood structure, making it useful for industrial and domestic applications. Despite its importance, there are only a few studies on the lateral organ boundary domain (LBD) genes in . The gene family contributes to prompting rooting in multiple plant species and therefore supports their survival directly. To understand the LBD family in , we verified its characteristics in this article. By comparing the sequences of and identifying conserved domains and motifs, we found that there were 38 members of the LBD family in , which were named to . Through evolutionary analysis, we found that they were divided into two different populations and five subfamilies in total. The gene family in (Hemsl.) Yang species had two subfamilies, including 32 genes in Class I and 6 genes in Class II. It mainly consists of a Lateral Organ Boundary (LOB) conservative domain, and the protein structure is mostly "Y"-shaped. The gene expression pattern of the gene family showed that the genes were mainly expressed in lateral organs of plants, such as flowers and fruits. The response of LBD transcription factors to red and blue light was summarized, and several models of optogenetic expression regulation were proposed. The effect of regulatory mechanisms on plant rooting was also predicted. Moreover, quantitative real-time PCR (qRT-PCR) revealed that most s were differentially expressed under cold, heat, drought, and salt stresses, indicating that s might play different functions depending on the type of abiotic stress. This study provides the foundation for further research on the function of LBD in this tree species in the future.