Abstract
This chapter discusses the discovery of new oligosaccharins, their structural elucidation, the description of their physiological effects and interactions with known plant hormones, the investigation of their biosynthesis, transport, binding, action and turnover within the plant, and the definition of their biological importance. It has become clear that some particular oligosaccharides can exert hormone-like regulatory effects when added to living plant cells. Oligosaccharides, which evoke such biological effects, are termed oligosaccharins. They are effective at very low concentrations; in addition, the biological effects are closely dependent on the precise chemical structure of the oligosaccharide. Oligosaccharins thus share some of the properties of the well-known plant hormones such as auxins, gibberellins, cytokinins, abscisic acid and ethylene. Some oligosaccharins appear to antagonise and/or mimic the biological effects of the traditional plant hormones. Most oligosaccharides have no known significant effect on plant tissues except as carbon and energy sources.
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