Role of lipids in the thermal plasticity of basidial fungus Favolaschia manipularis.

ABSTRACT

In this study, we examined the lipid composition of two strains of the tropical basidiomycete Favolaschia manipularis (Berk.) Teng, which differ in their adaptive potential to high (35 °C) and low (5 °C) temperatures. The results suggest that adaptation to extreme temperatures involves a change in the molecular composition of sterols, in addition to other well-known mechanisms of regulating membrane thickness and fluidity, such as changes in the lipid unsaturation and in the proportion of bilayer- and non-bilayer-forming lipids. It was demonstrated for the first time that adaptation to high temperature stress in fungi is accompanied by the accumulation of 9(11)-dehydroergosterol and ergosterol peroxide. Furthermore, increased thermal plasticity correlates with high storage lipid (triglycerides) content, accumulation of phosphatidic acid in the membrane, and an equal proportion of bilayer and non-bilayer lipids in the membrane.