Genome-wide identification of R2R3-MYB Family Genes and their Response to Stress in Dendrobium nobile

Abstract

Abstract R2R3-MYB is one of the largest and most important gene families, participating in the regulation of plant growth and development and response to abiotic stresses. However, the function of R2R3-MYB genes in Dendrobium nobile remains largely unknown. Here, a comprehensive genome-wide analysis of D. nobile R2R3-DnMYBs was performed, investigating phylogenic relationships, gene structures, motif composition, chromosomal locations, collinearity analysis, and cis-acting elements. Totally, 125 DnMYB genes were identified in the D. nobile genome, and they could be subdivided into 26 groups by further divided through phylogenetic analysis. Most genes with similar exon-intron structures and motif compositions in eaach subgroup exhibited similar functions. All of DnMYB genes were mapped on 19 chromosomes with the co-linearity relationship. Moreover, their expression patterns were analyzed in various tissues and abiotic stresses. The results showed that DnMYBs were significantly differential expressed in different tissues, following abiotic stresses and phytohormone treatments, indicating their possible roles in biological processes and some abiotic stress tolerance and adaptation. This work provides a comprehensive understanding of the R2R3-MYB family of D. nobile, and lays a foundation for future research on the potential function of DnMYB gene in the growth and development of D. nobile.