The effect of fluoride on the growth and fatty acid composition of Sphagnum fimbriatum at two temperatures [moss, lipid, glycolipids, phospholipids]
1980
Simola, L.K. | Koskimies-Soinineh, K. (Helsinki Univ. (Finland). Dept. of Botany)
The fatty acid composition of different lipid fractions (neutral, glyco- and phospholipids) was studied in Sphagnum fimbriatum Wils. gametophytes grown in aseptic cultures at two temperatures (15 deg C and 25 deg C). The effect of a growth-retarding concentration (0.1 mM) of KF was also investigated. Fifteen-day treatment with KF affected the fatty acid composition more strongly at the higher than at the lower temperature. The proportion of palmitic acid (16:0) increased but the proportion of linoleic (18:2) decreased in all the lipid fractions, and that of linolenic (18:3) acid decreased in the fractions containing glyco- and neutral lipids. This indicates that the fluoride ions inhibit lengthening of the fatty acid chain. Compared with gametophytes grown at 25 deg C, material cultivated at 15 deg C had a much higher proportion of a highly unsaturated fatty acid, linolenic acid (18:3), in all the lipid fractions but a lower proportion of oleic acid (18:1) in the neutral and phospholipids, and a lower proportion of linoleic (18:2) acid in all three fractions
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