Abstract
Abstract Xyloglucan (XG) is a polysaccharide found in the primary cell walls of higher plants. Its main role is architectural, probably limiting cell expansion (1-3). In addition, xyloglucan oligosaccharides (XGOs), enzymically released from XG, are potent plant growth regulators at nanomolar to micromolar concentrations, i.e. they are ‘oligosaccharins’ (4). They are not elicitors. XGOs are formed from XG by the action of cellulase (EC 3.2.1.4), which hydrolyses the polysaccharide backbone at Glc residues that lack side-chains.
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