An oligosaccharide derived from the plant cell wall that in small quantities induces a physiological response in a nearby cell of the same or a different plant, and thus acts as a molecular signal. Sometimes considered to be a plant hormone or plant growth substance. The best authenticated examples are involved in host-pathogen interactions and in the control of plant cell expansion.

Dictionary of molecular biology. 2004.

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  • florigen — Hypothetical plant growth substance (hormone) postulated to induce flowering. Existence not proven: recently suggested that it might be an oligosaccharin …   Dictionary of molecular biology

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