Fructan and its relationship to abiotic stress tolerance in plants |
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Authors: | David P Livingston III Dirk K Hincha Arnd G Heyer |
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Institution: | 1. USDA and North Carolina State University, 840 Method Road, Unit 3, Raleigh, NC, 27695, USA 2. Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476, Potsdam, Germany 3. Biologisches Institut, Abt. Botanik, Universit?t Stuttgart, Pfaffenwaldring 57, 70569, Stuttgart, Germany
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Abstract: | Numerous studies have been published that attempted to correlate fructan concentrations with freezing and drought tolerance.
Studies investigating the effect of fructan on liposomes indicated that a direct interaction between membranes and fructan
was possible. This new area of research began to move fructan and its association with stress beyond mere correlation by confirming
that fructan has the capacity to stabilize membranes during drying by inserting at least part of the polysaccharide into the
lipid headgroup region of the membrane. This helps prevent leakage when water is removed from the system either during freezing
or drought. When plants were transformed with the ability to synthesize fructan, a concomitant increase in drought and/or
freezing tolerance was confirmed. These experiments indicate that besides an indirect effect of supplying tissues with hexose
sugars, fructan has a direct protective effect that can be demonstrated by both model systems and genetic transformation. |
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