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-1, 3-Glucan Synthase from Lilium longiflorum Pollen ¹

^a Department of Horticulture, University of Illinois, Urbana, Illinois 61801

A particulate fraction from pollen tubes and ungerminated pollen of Lilium longiflorum incorporated ¹⁴C-glucose from UDP-glucose-¹⁴C into a lipid fraction and into -1, 3-glucan. Partial hydrolysis of the glucan yielded laminaribiose as the only radioactive disaccharide. The preferred substrate was UDP-glucose, and enzyme activity was stimulated by glucose and by -linked di- and trisaccharides. Enzyme from growing pollen tubes synthesized -1, 3-glucan more rapidly and produced a higher proportion of alkali-insoluble glucan than did enzyme from ungerminated pollen. The onset of pollen tube growth may be dependent on altered activity of -1, 3-glucan synthase.

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