PMID: 9539816Apr 29, 1998Paper

Sucrose is a signal molecule in assimilate partitioning

Proceedings of the National Academy of Sciences of the United States of America
T J Chiou, D R Bush

Abstract

The proton-sucrose symporter mediates the key transport step in the resource distribution system that allows many plants to function as multicellular organisms. In the results reported here, we identify sucrose as a signaling molecule in a previously undescribed signal-transduction pathway that regulates the symporter. Sucrose symporter activity declined in plasma membrane vesicles isolated from leaves fed exogenous sucrose via the xylem transpiration stream. Symporter activity dropped to 35-50% of water controls when the leaves were fed 100 mM sucrose and to 20-25% of controls with 250 mM sucrose. In contrast, alanine symporter and glucose transporter activities did not change in response to sucrose treatments. Decreased sucrose symporter activity was detectable after 8 h and reached a maximum by 24 h. Kinetic analysis of transport activity showed a decrease in Vmax. RNA gel blot analysis revealed a decrease in symporter message levels, suggesting a drop in transcriptional activity or a decrease in mRNA stability. Control experiments showed that these responses were not the result of changing osmotic conditions. Equal molar concentrations of hexoses did not elicit the response, and mannoheptulose, a hexokinase inhibitor, did n...Continue Reading

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Citations

Jul 13, 2006·Planta·Giselle Martínez-NoëlHoracio Pontis
Jan 16, 2013·Carbohydrate Research·Xiaodong Ren, Junjie Zhang
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