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. 1975 Jul;56(1):83-7.
doi: 10.1104/pp.56.1.83.

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

D Southworth  1 , D B Dickinson
Affiliations

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

D Southworth et al. Plant Physiol. 1975 Jul.

Abstract

A particulate fraction from pollen tubes and ungerminated pollen of Lilium longiflorum incorporated (14)C-glucose from UDP-glucose-(14)C into a lipid fraction and into beta-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 beta-linked di- and trisaccharides. Enzyme from growing pollen tubes synthesized beta-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 beta-1, 3-glucan synthase.

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