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
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.