Abundance and chemical characterization of extracellular carbohydrates released by the marine diatom Cylindrotheca fusiformis under N- and P-limitation

摘要: The effect of P- and N-depletion on the production molecular-level composition extracellular carbohydrates released by diatom Cylindrotheca fusiformis was examined in axenic batch cultures. Inorganic phosphorus depletion caused a higher release organic carbon per cell compared to nutrient-replete nitrogen-limited conditions. Gas-chromatographic analysis monosaccharide dissolved fraction showed galactose be major component exopolymers (33 – 42%). In P-limited treatment, an increase content decrease glucose found, while remaining saccharides almost unaffected. results point out relevance limitation not only causing total exopolysaccharide production, but also affecting neutral aldose C. fusiformis, with heteropolysaccharides being more abundant than glucan. overall sugar ...