multifunctional fructans and raffinose family oligosaccharides
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ID: 209410
2013
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Abstract
Fructans and Raffinose Family Oligosaccharides (RFOs) are the two most important classes of water soluble carbohydrates in plants. Recent progress is summarized on their metabolism (and regulation) and on their functions in plants and in food (prebiotics, antioxidants). Interest has shifted from the classic inulin-type fructans to more complex fructans. Similarly, alternative RFOs were discovered next to the classic RFOs. Considerable progress has been made in the understanding of structure-function relationships among different kinds of plant fructan metabolizing enzymes. This helps to understand their evolution from (invertase) ancestors, and the evolution and role of so-called defective invertases. Both fructans and RFOs can act as reserve carbohydrates, membrane stabilizers and stress tolerance mediators. Fructan metabolism can also play a role in osmoregulation (e.g. flower opening) and source-sink relationships. Here, two novel emerging roles are highlighted. First, fructans and RFOs may contribute to overall cellular ROS homeostasis by specific ROS scavenging processes in the vicinity of organellar membranes (e.g. vacuole, chloroplasts). Second, it is hypothesized that small fructans and RFOs act as phloem-mobile signaling compounds under stress. It is speculated that such underlying antioxidant and oligosaccharide signaling mechanisms contribute to disease prevention in plants as well as in animals and in humans.
| Reference Key |
ende2013frontiersmultifunctional
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| Authors | ;Wim eVan den Ende |
| Journal | phytochemistry letters |
| Year | 2013 |
| DOI |
10.3389/fpls.2013.00247
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