Genome-Wide Identification and Expression Patterns of the Gene Family in and its Responses to Low Temperature and Oxidative Stress.

SWEETs (sugars will eventually be exported transporters), a well-known class of sugar transporters, are involved in plant growth and development, sugar transport, biotic and abiotic stresses, etc. However, to date, there have been few investigations of in Orchidaceae. In this study, 23 genes were identified in for the first time, with an MtN3/saliva conserved domain, and were divided into four subgroups by phylogenetic tree. The same subfamily members had similar gene structures and motifs. Multiple -elements related to sugar and environmental stresses were found in the promoter region. Further, 21 genes were localized on 11 chromosomes and 2 paralogous pairs were found via intraspecific collinearity analysis. Expression profiling results showed that were tissue-specific. It also revealed that and were responsive to low temperature and oxidative stresses. In addition, subcellular localization study indicated that and were localized in the cell membrane. This study provided important clues for the in-depth elucidation of the sugar transport mechanism of genes and their functional roles in response to abiotic stresses.