[About different mechanisms of the biochemical adaptation of mycelial fungi to temperature stress: changes in lipids composition].

A comparative study was conducted concerning the effect of temperature stress on the lipid composition of representatives of the subkingdoms Eomycota and Neomycota. Changes in the composition of lipid acyl chains (such as saturation and desaturation, isomerization, and changes in the length of fatty acid carbon chains), in the phospholipid composition, and in the contents of sterols and other neutral lipids were revealed. Hyperthermia resulted in (i) an increase in the phosphatidylcholine level; (ii) a decrease in the phosphatidylethanolamine level; (iii) a rise in the content of reserve lipids (triacylglycerols); and (iv) a decline in the free fatty acid level in the neutral lipids. An inverse pattern occurred under hypothermic conditions. The peculiarities in the patterns of the temperature adaptation-related changes in the lipid bilayer composition are considered in terms of the systematic position of the fungi.