The comparative study of lipid composition was carried out in four species of marine algae, Ahnfeltia tobuchiensis, Laminaria japonica, Sargassum pallidum, and Ulva fenestrata, as well as a higher plant grass wrack (Zostera marina). Plants were collected in the Japan Sea in spring at 2.9 and 5.5°C and in summer at 23°C. The main lipid components of membranes were determined, and the general patterns of the ratio of phospholipids (PL), glycolipids (GL), betaine (BL), and neutral (NL) lipids were discerned. The relative content of NL in all species (except A. tobuchiensis) was higher in summer. The level of triacylglycerols was as high as 18–37%. The content of individual classes of PL and GL varied between the spring and summer samples, the relative content of PL being higher in spring. In most species, the ratio of PL to GL decreased in summer. The content of free sterols did not depend on the season. The molar ratios of phosphatidylcholine and diacylglycerol-o-(hydroxymethyl)-(N,N,N-trimethyl)homoserine to free sterols varied from 0.9 to 1.7. The seasonal changes of lipid composition were apparently related to macrophyte adaptation to water temperature and to biology of their development.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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