Abstract
To elucidate the roles of fatty acyl chains in phosphoglycerides during egg diapause process of the silkworm Bombyx mori, fatty acids of phosphatidylcholine (PC) and phosphatidylethanolamine (PE) were analyzed by gas-liquid chromatography. Diapause-associated changes occurred in the proportion of oleic acid (C18 : 1) and linolenic acid (C18 : 3) tails in total fatty acids of PC and PE. In diapause initiation, the levels of C18 : 1 increased (about 35-40%) and that of C18 : 3 decreased (about 20%). These ratios remained constant during diapause maintenance. However, transfer of diapause eggs from 25°C to 5°C resulted in decline in C18 : 1 and rise in C18 : 3 of both PC and PE. Both levels shifted 28-30% in diapause termination. These results suggest that fatty acyl chains in PC and PE are modulated during the diapause process and that cold exposure induces the unsaturation with C18 : 3 of phosphoglycerides.
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