| Abstract: | Ten phospholipids were identified in hyphal membrane preparations of Fusarium oxysporum f. sp. lycopersici when the cells were grown to the late log phase at 15, 25, and 37 degrees C, respectively. The major phospholipids present were phosphatidylcholine (PC) and phosphatidylethanolamine (PE), which together made up about 70% of the total membrane phospholipids. The degree of unsaturation in the acyl group of the phospholipids was inversely related to growth temperature. The polar head group composition was also affected by growth temperature. Cells grown at 15 and 25 degrees C contained the same relative proportions of PC and PE, but when the growth temperature was raised to 37 degrees C, the ratio of PC to PE was doubled. A methylating system capable of converting PE to PC was demonstrated in vitro. |
