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We previously demonstrated that 20 mM sucrose promotes the upper axillary bud outgrowth in two-node stems of Chrysanthemum morifolium . In this study, we aimed to screen for potential genes involved in this process. Quantitative reverse transcription (qRT)-PCR analysis of sugar-related genes in the upper axillary bud of plants treated with 20 mM sucrose revealed the specific expression of the gene CmSWEET17 . Expression of this gene was increased in the bud, as well as the leaves of C. morifolium, following exogenous sucrose treatment. CmSWEET17 was isolated from C. morifolium and a subcellular localization assay confirmed that the protein product was localized in the cell membrane. Overexpression of CmSWEET17 promoted upper axillary bud growth in the two-node stems treatment as compared with the wild-type. In addition, the expression of auxin transporter genes CmAUX1 , CmLAX2, CmPIN1, CmPIN2, and CmPIN4 was upregulated in the upper axillary bud of CmSWEET17 overexpression lines, while indole-3-acetic acid content decreased. The results suggest that CmSWEET17 could be involved in the process of sucrose-induced axillary bud outgrowth in C. morifolium , possibly via the auxin transport pathway.

Sugar Transporter, CmSWEET17, Promotes Bud Outgrowth in Chrysanthemum Morifolium