Abstract
BackgroundMYB transcription factors, comprising one of the largest transcription factor families in plants, play many roles in secondary metabolism, especially in anthocyanin biosynthesis. However, the functions of the PdeMYB transcription factor in colored-leaf poplar remain elusive.ResultsIn the present study, genome-wide characterization of the PdeMYB genes in colored-leaf poplar (Populus deltoids) was conducted. A total of 302 PdeMYB transcription factors were identified, including 183 R2R3-MYB, five R1R2R3-MYB, one 4R-MYB, and 113 1R-MYB transcription factor genes. Genomic localization and paralogs of PdeMYB genes mapped 289 genes on 19 chromosomes, with collinearity relationships among genes. The conserved domain, gene structure, and evolutionary relationships of the PdeMYB genes were also established and analyzed. The expression levels of PdeMYB genes were obtained from previous data in green leaf poplar (L2025) and colored leaf poplar (QHP) as well as our own qRT-PCR analysis data in green leaf poplar (L2025) and colored leaf poplar (CHP), which provide valuable clues for further functional characterization of PdeMYB genes.ConclusionsThe above results provide not only comprehensive insights into the structure and functions of PdeMYB genes but also provide candidate genes for the future improvement of leaf colorization in Populus deltoids.
Highlights
MYB transcription factors, comprising one of the largest transcription factor families in plants, play many roles in secondary metabolism, especially in anthocyanin biosynthesis
MYB transcription factors can be classified into four types according to the number of MYB domains: 1R-MYB, R2R3-MYB, R1R2R3-MYB, and 4R-MYB [5,6,7,8]
Genome‐wide identification of the PdeMYB gene family in P. deltoids A total of 302 PdeMYB genes were identified based on the complete genome sequences of P. deltoids
Summary
MYB transcription factors, comprising one of the largest transcription factor families in plants, play many roles in secondary metabolism, especially in anthocyanin biosynthesis. MYB transcription factors can be classified into four types according to the number of MYB domains: 1R-MYB, R2R3-MYB, R1R2R3-MYB, and 4R-MYB [5,6,7,8]. Among these MYB transcription factors, the R2R3-MYB group is the largest transcription factor subfamily in plants [8, 9]. There are 126 R2R3-MYB transcription factors in Arabidopsis thaliana [10], 108 in grape [11], 100 in sweet orange [12], 222 in apple [13] and 192 genes in Populus trichocarpa [14]
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