Journal
ANNUAL REVIEW OF PLANT BIOLOGY
Volume 57, Issue -, Pages 675-709Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev.arplant.57.032905.105441
Keywords
glucose; sucrose; trehalose; Arabidopsis; hexokinase; Snfl-related protein kinase
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Funding
- NIGMS NIH HHS [R01 GM060493] Funding Source: Medline
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM060493] Funding Source: NIH RePORTER
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Sugars not only fuel cellular carbon and energy metabolism but also play pivotal roles as signaling molecules. The experimental amenability of yeast as a unicellular model system has enabled the discovery of multiple sugar sensors and signaling pathways. In plants, different sugar signals are generated by photosynthesis and carbon metabolism in source and sink tissues to modulate growth, development, and stress responses. Genetic analyses have revealed extensive interactions between sugar and plant hormone signaling, and a central role for hexokinase (HXK) as a conserved glucose sensor. Diverse sugar signals activate multiple HXK-dependent and HXK-independent pathways and use different molecular mechanisms to control transcription, translation, protein stability and enzymatic activity. Important and complex roles for Snf1-related kinases (SnRKs), extracellular sugar sensors, and trehalose metabolism in plant sugar signaling are now also emerging.
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