Genome-Wide Identification and Expression Patterns of AcSWEET Family in Pineapple and AcSWEET11 Mediated Sugar Accumulation.

Pineapple ( L.) is an important fruit crop in tropical regions, and it requires efficient sugar allocation during fruit development. Sugars Will Eventually be Exported Transporters (SWEETs) are a group of novel sugar transporters which play critical roles in seed and fruit development. However, the function of remains unknown in the sugar accumulation. Herein, 17 were isolated and unevenly located in 11 chromosomes. Analysis of a phylogenetic tree indicated that 17 genes were classified into four clades, and the majority of in each clade shared similar conserved motifs and gene structures. Tissue-specific gene expression showed that expression profiles of displayed differences in different tissues and five were strongly expressed during fruit development. was highly expressed in the stage of mature fruits in 'Tainong16' and 'Comte de paris', which indicates that was important to fruit development. Subcellular localization analysis showed that AcSWEET11 was located in the cell membrane. Notably, overexpression of could improve sugar accumulation in pineapple callus and transgenic tomato, which suggests that might positively contribute to sugar accumulation in pineapple fruit development. These results may provide insights to enhance sugar accumulation in fruit, thus improving pineapple quality in the future.