Effect of Environmental Temperature Transition on Fatty Acid Composition of Membrane Glycerolipids in Marine Cyanobacterium Aphanizomenon sp.

(Khaled Abu Naga, Hana Akeclan, T.)

---

Abstract

In this study the fatty acid composition and the degree of unsaturation were followed upon temperature shift from 28oC to15oC and from 15oCto 28oC. Temperature shift from 28oC to 15oC led to changes in the overall fatty acid composition in total lipid and glycerolipid classes, with rapid and slow responses in the fatty acid content during the adaptation period. The rapid response-limited to the 12h following temperature transition-observed in PG fraction in which C18:1 increased, and almost 2.5 fold, while C16:0 and C18:3 level decreased, and a relatively rapid response was presented by decrease in C16:0 and concomitant increase in C18:3 in MGDG and DGDG. A comparison of fatty acid composition at 28oC (0h) with those at the end of the 15oC growth period (48) shows that the most significant changes were the increase of C18:3/C18:2 ratio in the total lipid, MGDG and SL. The results also show an increase in the degree of concentration in the total lipid, MGDG and SL fractions, while there is no change in DGDG and decrease in PG fraction.
PDF

References