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CORRELATED LIGHT AND ELECTRON MICROSCOPE STUDIES ON BROWN ALGAE I. LOCALIZATION OF ALGINIC ACID AND SULPHATED POLYSACCHARIDES IN DICTYOTA
Author(s) -
EVANS L. V.,
HOLLIGAN M. SUSAN
Publication year - 1972
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1972.tb01994.x
Subject(s) - alginic acid , polysaccharide , fucoidan , brown algae , vesicle , biology , thallus , cell wall , botany , algae , electron microscope , cytoplasm , biochemistry , membrane , physics , optics
S ummary By electron microscopy and light microscope histochemical techniques, alginic acid and sulphated polysaccharides (probably largely fucoidan) have been located in the cell walls of Dictyota dichotoma. The cell walls of the vegetative thallus and those of mature reproductive cells (tetrasporangia, tetraspores, antheridia and oogonia) are composed of three to four well‐defined layers, mainly of alginic acid, sulphated polysaccharide or a mixture of these substances. Prior to their secretion the two types of polysaccharide can generally be detected in conspicuous, peripheral, intra‐cellular cytoplasmic vesicles. Alginic acid is liberated from vesicles through the plasma membrane by reversed pinocytosis. The results are discussed in relation to other work on the polysaccharides and histochemistry of brown algae.