Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 71, Issue 10, Pages 3110-3125Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa055
Keywords
Carbon allocation and partitioning; carbon starvation; gene structure; Medicago truncatula; monosaccharide sugar transporters; symbiotic nitrogen fixation
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Funding
- Onassis Foundation
- Bodossaki Foundation [BDA-394]
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Monosaccharide transporters (MSTs) represent key components of the carbon transport and partitioning mechanisms in plants, mediating the cell-to-cell and long-distance distribution of a wide variety of monosaccharides. In this study, we performed a thorough structural, molecular, and physiological characterization of the monosaccharide transporter gene family in the model legume Medicago truncatula. The complete set of MST family members was identified with a novel bioinformatic approach. Prolonged darkness was used as a test condition to identify the relevant transcriptomic and metabolic responses combining MST transcript profiling and metabolomic analysis. Our results suggest that MSTs play a pivotal role in the efficient partitioning and utilization of sugars, and possibly in the mechanisms of carbon remobilization in nodules upon photosynthate-limiting conditions, as nodules are forced to acquire a new role as a source of both C and N.
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