Genome-Wide Identification and Expression Profile Analysis of Sugars Will Eventually Be Exported Transporter () Genes in and Their Responsiveness to subspecies () Infection.

SWEET, sugars will eventually be exported transporter, is a novel class of sugar transporter proteins that can transport sugars across membranes down a concentration gradient. It plays a key role in plant photosynthetic assimilates, phloem loading, nectar secretion from nectar glands, seed grouting, pollen development, pathogen interactions, and adversity regulation, and has received widespread attention in recent years. To date, systematic analysis of the family in has not been documented, although the genome has been reported in . In this study, 19 genes were genome-wide identified in , and unevenly located in 10 chromosomes. They were further clustered into four clades by a phylogenetic tree, and almost every clade has its own unique motifs. Synthetic analysis confirmed two pairs of segmental duplication events of genes. Heatmaps of tissue-specific and subsp. () infection showed that genes had different expression patterns, so may play widely varying roles in development and stress tolerance in . Moreover, quantitative reverse transcription-PCR (qRT-PCR) analysis revealed that some of the responded to infection, among which eight genes were significantly upregulated and six genes were significantly downregulated, revealing their potential functions in response to infection. The promoter sequences of contained 51 different types of the 1380 cis-regulatory elements, and each gene contained at least two phytohormone responsive elements and one stress response element. In addition, a subcellular localization study indicated that and were found to be localized to the plasma membrane. These findings provide insights into the characteristics of genes and contribute to future studies on the functional characteristics of genes, and then improve infection tolerance in through molecular breeding.