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The effect of fluoride on the growth and fatty acid composition of sphagnum fimbriatum at 2 temperatures


The effect of fluoride on the growth and fatty acid composition of sphagnum fimbriatum at 2 temperatures



Physiologia Plantarum 50(1): 74-77



ISSN/ISBN: 0031-9317

DOI: 10.1111/j.1399-3054.1980.tb02687.x

The fatty acid composition of different lipid fractions (neutral, glyco- and phospholipids) was studied in S. fimbriatum Wils. gametophytes grown in aseptic cultures at 2 temperatures (15.degree. C and 25.degree. C). The effect of a growth-retarding concentration (0.1 mM) of KF [an inorganic pollutant] was also investigated. Fifteen-day treatment with KF affected the fatty acid composition stronger at the higher than at the lower temperature. The proportion of plamitic 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.degree. C, material cultivated at 15.degree. 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 3 fractions.

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Accession: 006644034

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