Evidence for water deficit-induced mass increases of raffinose family oligosaccharides (RFOs) in the leaves of three Craterostigma resurrection plant species

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dc.contributor.authorEgert, Aurelieen_ZA
dc.contributor.authorEicher, Barbaraen_ZA
dc.contributor.authorKeller, Felixen_ZA
dc.contributor.authorPeters, Shaunen_ZA
dc.date.accessioned2016-11-15T07:53:44Z
dc.date.available2016-11-15T07:53:44Z
dc.date.issued2015-07
dc.descriptionCITATION: Egert, A., et al. 2015. Evidence for water deficit-induced mass increases of raffinose family oligosaccharides (RFOs) in the leaves of three Craterostigma resurrection plant species. Frontiers in Physiology, 6:206, doi:10.3389/fphys.2015.00206.
dc.descriptionThe original publication is available at www.frontiersin.org
dc.description.abstractThe leaves of the resurrection plant Craterostigma plantagineum accumulate sucrose during dehydration, via a conversion from the unusual C8 ketose-sugar 2-octulose. However, raffinose family oligosaccharides (RFOs) have been shown to be major photosynthetic products in this plant. The tetrasaccharide stachyose is the major phloem-mobile carbohydrate and is used as a carbon store in roots. It has been suggested that this carbon store is remobilized during rehydration, presumably for cellular repair processes. We examined the effects of water deficit on the leaf water-soluble carbohydrate profiles of three Craterostigma species. Apart from the classical 2-octulose-to-sucrose interconversion, there was a strong water deficit-associated mass increase of RFOs up to the pentasaccharide verbascose. However, the activities of three dedicated RFO biosynthetic enzymes (raffinose, stachyose, and verbascose synthase) was not correlated with RFO accumulation, suggesting that biosynthetic enzyme activities measured in the early stages of water-deficit were sufficient to synthesize enough galactinol and lead to RFO accumulation in the leaves. Our findings are suggestive of RFOs providing additional carbohydrate-based stress protection to the leaves of these plants during the desiccated state.en_ZA
dc.description.urihttp://journal.frontiersin.org/article/10.3389/fphys.2015.00206/full
dc.description.versionPublisher's version
dc.format.extent6 pages : illustrationsen_ZA
dc.identifier.citationEgert, A., et al. 2015. Evidence for water deficit-induced mass increases of raffinose family oligosaccharides (RFOs) in the leaves of three Craterostigma resurrection plant species. Frontiers in Physiology, 6:206, doi:10.3389/fphys.2015.00206
dc.identifier.issn1664-042X (online)
dc.identifier.otherdoi:10.3389/fphys.2015.00206
dc.identifier.urihttp://hdl.handle.net/10019.1/99854
dc.language.isoen_ZAen_ZA
dc.publisherFrontiers Media
dc.rights.holderAuthors retain copyright
dc.subjectRaffinose oligosaccharidesen_ZA
dc.subjectResurrection plantsen_ZA
dc.subjectDesiccation toleranceen_ZA
dc.titleEvidence for water deficit-induced mass increases of raffinose family oligosaccharides (RFOs) in the leaves of three Craterostigma resurrection plant speciesen_ZA
dc.typeArticleen_ZA
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