Algal Walls — Cytology of Formation

摘要: Although the production of nonfibrillar extracellular polysaccharides is a feature nearly all algal cells and indeed attains industrial importance in some instances (kelps), comparatively few cytological studies have been carried out with respect to their sites synthesis modes liberation. Nevertheless it clear that elements endomembrane system (endoplasmic reticulum, ER; Golgi apparatus, GA) are principally involved. Autoradiography (Evans et al. 1974) comparative micromorphometry secretory nonsecretory stages (Ramus 1972, Ramus Robins 1975) implicated GA red mucilage production. The participation ER glycoprotein adhesive secreted by ship-fouling green alga Enteromorpha has demonstrated cytochemical (for carbohydrate moiety) autoradiographic protein means (Callow Evans 1977). Ultrastructural, autoradiographical, microanalytical sulfur detection sulfated polysaccharides) evidence pertaining slime-polysaccharide secretion also provided for various representatives brown algae Holligan 1973, Callow 1974, 1976). Analysis isolated dictyosomal fractions from Fucus zygotes 1978, Coughlan 1978) furthermore shown this fraction be first labeled when 35S-sulfate applied exogenously. Moreover contains an enzyme responsible transfer galactose UDP-galactose fucose fucoidan.