Studies on the Synthesis and Composition of Extracellular Mucilage in the Unicellular Red Alga Rhodella

Author:

EVANS L. V.1,CALLOW MAUREEN E.1,PERCIVAL ELIZABETH2,FAREED V.2

Affiliation:

1. Department of Plant Sciences, The University of Leeds, Leeds, England

2. Department of Chemistry, Royal Holloway College, University of London, Egham, Surrey, England

Abstract

35SO42- has been used to investigate the production of extracellular mucilage by log-phase cells. Uptake of isotope occurs most rapidly in the light, when cells are actively dividing. The mucilage comprises about 50% carbohydrate, 16% protein and 10% sulphate. The major sugar is xylose; uronic acid, a small amount of galactose, glucose (trace) and 2 reducing substances are also present. Methylation studies have established the major linkages. Electron-microscope autoradiography shows that the mucilage is packaged in the Golgi bodies, passing to the plasmalemma in large vesicles. Sulphation of the mucilage occurs in the Golgi cisternae.

Publisher

The Company of Biologists

Subject

Cell Biology

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