Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 66, Issue 1, Pages 147-159Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eru394
Keywords
Arabidopsis; STP1; sugar repression; sugar signalling; sugar transporter; transcriptional regulation
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Funding
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [154392, 127546]
- DGAPA [IN208211-3, IB200511]
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Sugars regulate the expression of many genes at the transcriptional level. In Arabidopsis thaliana, sugars induce or repress the expression of >1800 genes, including the STP1 (SUGAR TRANSPORTER PROTEIN 1) gene, which encodes an H+/monosaccharide cotransporter. STP1 transcript levels decrease more rapidly after the addition of low concentrations of sugars than the levels of other repressed genes, such as DIN6 (DARK-INDUCED 6). We found that this regulation is exerted at the transcriptional level and is initiated by phosphorylatable sugars. Interestingly, the sugar signal that modulates STP1 expression is transmitted through a HEXOKINASE 1-independent signalling pathway. Finally, analysis of the STP1 5' regulatory region allowed us to delimit a region of 309 bp that contains the cis elements implicated in the glucose regulation of STP1 expression. Putative cis-acting elements involved in this response were identified.
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