Section 7
Chapter 6,682

The galactan sulfates of the conchocelis phases of porphyra leucostricta and bangia atropurpurea

Gretz, M.R.; Mccandless, E.L.; Aronson, J.M.; Sommerfeld, M.R.

Journal of Experimental Botany 34(143): 705-711


ISSN/ISBN: 0022-0957
Accession: 006681068

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Galactan sulfates were extracted from mechanically isolated cell walls of laboratory cultured conchocelis phases of P. leucostricta and B. atropurpurea and their structure established by chemical methods and 13C-NMR spectroscopy. The polysaccharides represent an extreme structure for porphyran-type polymers in that they consist almost entirely of 3-linked .beta.-D-galactosyl residues alternating with 4-linked .alpha.-L-galactose-6-sulfate residues, the molar ratio of D to L units being .apprx. 1:1. 13C-NMR and GLC and paper chromatography gave no indication of 6-O-methyl-D-galactose in these polymers. Conchocelis galactans are chemically distinct from porphyrans of generic phases of Porphyra and Bangia.