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MYB  family genes are widely distributed in plants and comprise one of the largest transcription factors involved in various developmental processes and defense responses of plants. To date, few  MYB  genes and little expression profiling have been reported for citrus. Here, we describe and classify 177 members of the sweet orange  MYB  gene ( CsMYB ) family in terms of their genomic gene structures and similarity to their putative  Arabidopsis  orthologs. According to these analyses, these  CsMYBs  were categorized into four groups (4R-MYB, 3R-MYB, 2R-MYB and 1R-MYB). Gene structure analysis revealed that 1R-MYB genes possess relatively more introns as compared with 2R-MYB genes. Investigation of their chromosomal localizations revealed that these  CsMYBs  are distributed across nine chromosomes. Sweet orange includes a relatively small number of  MYB  genes compared with the 198 members in  Arabidopsis , presumably due to a paralog reduction related to repetitive sequence insertion into promoter and non-coding transcribed region of the genes. Comparative studies of  CsMYBs  and  Arabidopsis  showed that  CsMYBs  had fewer gene duplication events. Expression analysis revealed that the  MYB  gene family has a wide expression profile in sweet orange development and plays important roles in development and stress responses. In addition, 337 new putative microsatellites with flanking sequences sufficient for primer design were also identified from the 177  CsMYBs . These results provide a useful reference for the selection of candidate  MYB  genes for cloning and further functional analysis forcitrus.

Genome-Wide Classification and Evolutionary and Expression Analyses of Citrus MYB Transcription Factor Families in Sweet Orange