• Light-Induced Changes in Fatty Acid Profiles of Specific Lipid Classes in Several Freshwater Phytoplankton Species.

Light-Induced Changes in Fatty Acid Profiles of Specific Lipid Classes in Several Freshwater Phytoplankton Species.

Frontiers in plant science (2016-03-26)
Alexander Wacker, Maike Piepho, John L Harwood, Irina A Guschina, Michael T Arts

We tested the influence of two light intensities [40 and 300 μmol PAR / (m(2)s)] on the fatty acid composition of three distinct lipid classes in four freshwater phytoplankton species. We chose species of different taxonomic classes in order to detect potentially similar reaction characteristics that might also be present in natural phytoplankton communities. From samples of the bacillariophyte Asterionella formosa, the chrysophyte Chromulina sp., the cryptophyte Cryptomonas ovata and the zygnematophyte Cosmarium botrytis we first separated glycolipids (monogalactosyldiacylglycerol, digalactosyldiacylglycerol, and sulfoquinovosyldiacylglycerol), phospholipids (phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol, and phosphatidylserine) as well as non-polar lipids (triacylglycerols), before analyzing the fatty acid composition of each lipid class. High variation in the fatty acid composition existed among different species. Individual fatty acid compositions differed in their reaction to changing light intensities in the four species. Although no generalizations could be made for species across taxonomic classes, individual species showed clear but small responses in their ecologically-relevant omega-3 and omega-6 polyunsaturated fatty acids (PUFA) in terms of proportions and of per tissue carbon quotas. Knowledge on how lipids like fatty acids change with environmental or culture conditions is of great interest in ecological food web studies, aquaculture, and biotechnology, since algal lipids are the most important sources of omega-3 long-chain PUFA for aquatic and terrestrial consumers, including humans.

Product Number
Product Description

Molybdenum Blue spray reagent
L-α-Phosphatidylethanolamine from egg yolk, Type III, ≥97% (TLC), lyophilized powder
Digalactosyl diglyceride, ≥93% (TLC), from whole wheat flour, lyophilized powder
L-α-Phosphatidylinositol ammonium salt from Glycine max (soybean), 10 mg/mL in chloroform, ≥97.0%, solution
L-α-Phosphatidyl-DL-glycerol sodium salt from egg yolk lecithin, ≥99% (TLC), lyophilized powder
L-α-Phosphatidylcholine, egg yolk, Type XVI-E, ≥99% (TLC), lyophilized powder