亚洲玉米螟幼虫对氮、糖的吸收和利用

本文以不同含氮和含糖量的系列人工饲料为材料，研究了亚洲玉米螟Ostrinia fur nacalis(Guen6e)幼虫对氮和糖的吸收和利用。结果表明：幼虫对饲料中氮的吸收能力随虫龄增加而下降，对糖的吸收能力则随之而增强；5龄幼虫对糖的吸收能力随所食饲料中氮含量的增加而增强，而对氮的吸收则与饲料糖含量关系不大，5龄幼虫对氮和糖的消耗速率均随饲料含糖量增加而加快，但幼虫的氮利用率和虫体含氮量则随之下降；幼虫的氮消耗速率随饲料含氮量的增加而增加，而氮利用率则下降，5龄幼虫的氮利用率比3龄幼虫的氮利用率低，导致虫体含氮量的迅速下降。这些结果说明饲料中氮含量影响幼虫对糖的吸收，高龄幼虫对糖的需要量增加而对氮的需要则较稳定，饲料中糖比氮更重要。

ABSORPTION AND UTILIZATION OF NITROGEN AND SUGAR IN DIET BY THE ASIAN CORN BORER OSTRINIA FURNACALIS LARVAE

The absorption and utilization of nitrogen and sugar in diet by the Asian corn borer (Ostrinia furnacalis) larvae reared on artificial diets with different levels of nitrogen and sugar were studied. The results showed that the absorption of nitrogen decreased while that of sugar increased with larval development from the third to fifth instar. In the fifth instar larvae the absorption of sugar increased with the increase of nitrogen content in the diet.In the fifth instar larvae the consumption rates of nitrogen and sugar increased but the nitrogen utilization rate and the nitrogen content decreased when fed on the diet with higher sugar content. The nitrogen content in larvae decreased significantly from the third to fifth instar when they were fed on the diet with 3. 01 % nitrogen content, due to the decrease in nitrogen utilization rate. These results indicated that the nitrogen and sugar contents in diets influence their absorption and utilization by the larvae, and sugar is more important than nitrogen for older larvae.