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The major facilitator superfamily (MFS) is one of the largest known membrane transporter families. MFSs are involved in many essential functions, but studies on the MFS family in poplar have not yet been reported. Here, we identified 41  MFS  genes from  Populus trichocarpa  ( PtrMFSs ). We built a phylogenetic tree, which clearly divided members of PtrMFS into six groups with specific gene structures and protein motifs/domains. The promoter regions contain various cis-acting elements involved in stress and hormone responsiveness. Genes derived from segmental duplication events are unevenly distributed in 17 poplar chromosomes. Collinearity analysis showed that  PtrMFS  genes are conserved and homologous to corresponding genes from four other species. Transcriptome data indicated that 40 poplar  MFS  genes were differentially expressed when treated with  Fusarium oxysporum . Co-expression networks and gene function annotations of  MFS  genes showed that  MFS  genes tightly co-regulated and closely related in function of transmembrane transport. Taken together, we systematically analyzed structure and function of genes and proteins in the PtrMFS family. Evidence indicated that poplar  MFS  genes play key roles in plant development and response to a biological stressor.

Genome-Wide Analysis of Major Facilitator Superfamily and Its Expression in Response of Poplar to Fusarium oxysporum