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Plant fructan exohydrolases: a role in signaling and defense?
Wim Van den Ende1, Barbara De Coninck, André Van Laere
1KU Leuven, Institute of Botany and Microbiology, Laboratory of Molecular Plant Physiology, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium. wim.vandenende@bio.kuleuven.ac.be
Abstract:
Fructans are fructose oligomers and polymers synthesized by a small number of plant and bacterial species and mainly function as reserve carbohydrates. The terminal fructosyl-fructose linkages can be degraded by fructan exohydrolases (FEHs), occurring in bacteria, fungi and fructan plants. Unexpectedly, it was found that FEHs also occur in non-fructan plants such as Beta vulgaris and Arabidopsis thaliana that apparently lack endogenous fructan substrates. FEHs might have defense-related roles acting on bacterial fructan-containing slimes or might act on minute (up to now undetected) amounts of fructans acting as signals in plants.
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