亚洲玉米螟对常见植物甾醇代谢利用研究

亚洲玉米螟Ostrinia furndcalis G.在缺少甾醇的饲料上不能正常生长发育，能通过脱烷基化作用将△⁵-植物甾醇，如谷甾醇和豆甾醇脱去支链上的烷基变成胆甾醇加以利用，而对△⁷-烯甾烷醇的代谢则有困难。

Study on metabolism and utilization of common plant sterols by Asian corn borer (Ostrinia furnacalis G.)

The bioassay data showed that the Asian corn borer ( Ostrinia furnacalis G. ) was unable to grow and develop on diet without sterols . When cholesterol or sitosterol was added to the diet withoutsterols, the larvae could normally grow and develop. They could also grow and develop on the stigmasterol diet, but the average body weight of 9-day larvae and pupation ratio were lower than that of the control and the cholesterol and sitosterol diet groups. The △⁷-lathosterol in diet was difficult to be metabolized in this species. After extraction and purification, the samples of sterols were analyzed by capillary GC. The results indicated that the quantity of cholesterol in 5th instar larvae of Asian corn borer fed on sitosterol diet was similar to that of the ones fed on normal diet, however the quantity of cholesterol in 5th instar larvae fed on stigmasterol diet was much lower. The results suggest that in Asian corn borer △⁵-plant sterols-sitosterol and stigmasterol could be converted to cholesterol by dealkylation at C₂₄ Of the side chain. But there exists metabolic difference between sitosterol and stigmasterol.