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Sugars Will Eventually be Exported Transporters (SWEET) are a novel type of sugar transporter that plays crucial roles in multiple biological processes. From banana, for the first time, 25  SWEET  genes which could be classified into four subfamilies were identified. Majority of  MaSWEETs  in each subfamily shared similar gene structures and conserved motifs. Comprehensive transcriptomic analysis of two banana genotypes revealed differential expression patterns of  MaSWEETs  in different tissues, at various stages of fruit development and ripening, and in response to abiotic and biotic stresses. More than 80%  MaSWEETs  were highly expressed in BaXi Jiao (BX,  Musa acuminata  AAA group, cv. Cavendish), in sharp contrast to Fen Jiao (FJ,  M .  acuminata  AAB group) when pseudostem was first emerged. However,  MaSWEETs  in FJ showed elevated expression under cold, drought, salt, and fungal disease stresses, but not in BX. Interaction networks and co-expression assays further revealed that  MaSWEET -mediated networks participate in fruit development signaling and abiotic/biotic stresses, which was strongly activated during early stage of fruit development in BX. This study provides new insights into the complex transcriptional regulation of  SWEETs , as well as numerous candidate genes that promote early sugar transport to improve fruit quality and enhance stress resistance in banana.

Genome-wide analyses of SWEET family proteins reveal involvement in fruit development and abiotic/biotic stress responses in banana