珪藻Chaetoceros pseudocurvisetusの生活形と脂質組成の関係

概要

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Lipids were analyzed for three different life forms of a marine planktonic diatom, Chaetoceros pseudocurvisetus, cultured in different nutrient media, in order to examine the influence of nutrient deficiency to the variation of the lipid distribution. TLC-FID and GC-MS analyses show large differences in lipid composition between the vegetative cell (VC) cultured in a nitrate-rich medium and the resting spore (RS) and resting cell (RC) cultured in nitrate-poor media. TLC-FID profiles of total lipids showed that triacylglycerols are abundant in the VC, whilst free fatty acids and sterols are abundant in the RS and RC. The VC shows lack of n-alkanes, unsaturated fatty acids and sterols. In contrast, the RS and RC show a broad n-alkane distribution maximizing at C_<17> with no odd/even carbon number preference, the presence of a C_<21> polyunsaturated alkene, phytadienes, unsaturated fatty acids and Δ^5-sterols. A C_<30> sterol is specifically detected in the RS, while pristane in the RC. These results indicate that the distribution of lipids from C. pseudocurvisetus is strongly affected by nutrient condition. This finding suggests the possibility of the use of lipids to indicate paleonutrient conditions of sea surface water, and also provides a new insight to explain lipid distributions in field samples investigated before.
日本有機地球化学会の論文
2005-12-26