麦红吸浆虫幼虫滞育期间糖类物质变化

分析研究了麦红吸浆虫Sitodiplosis mosellana (Gehin) 幼虫滞育期间总糖、海藻糖和糖原含量的变化。结果表明： 不同滞育年限幼虫的总糖含量无显著差异。在滞育年周期中，不同时期的滞育幼虫总糖含量明显不同。幼虫老熟入土滞育以前的总糖含量明显高于入土滞育期间。入土滞育过程中，越冬期和春季的总糖含量明显高于夏季和秋季。同期的裸露幼虫与结茧幼虫的总糖含量仅在秋季有一定的差异，其他时间基本相似。结茧幼虫滞育期间的海藻糖含量一直维持较高的水平，说明其滞育期间的糖醇积累型属于海藻糖积累型；秋季与春季糖原含量的增加可能与麦红吸浆虫的滞育解除或滞育强度的变化有一定的关系。

Change of carbohydrate contents in larvae of the wheat midge, Sitodiplosis mosellana (Gehin) during mature and diapause stage

Contents of total carbohydrate, trehalose, glycogen in diapausing larvae of the wheat midge, Sitodiplosis mosellana (Gehin) in various periods were examined, respectively. Results showed that there was no significant difference in the contents of total carbohydrates between 1st and 2nd year diapausing larvae. There were obvious differences in the content of total carbohydrates among larvae from the various seasons. The content of total carbohydrates in the mature larvae living on the wheat head was higher than that of larvae in the soil. Based on the change of total carbohydrate contents in the diapausing larvae, its development could be divided into two stages: Stage 1, from June to October; and Stage 2, from November to April of next year. There was lower content of carbohydrates in Stage 1 than that in Stage 2. Change trends of carbohydrate content in both cocooned and non-cocooned larvae were similar in various periods. Content of trehalose in cocooned larvae in whole diapause period was kept on a higher level, and therefore the type of carbohydrate-alcohol accumulation of cocooned larvae of the wheat midge in diapause periods belongs to trehalose accumulation. The increasing content of glycogen was possibly related to diapause termination or change of diapause intensity in autumn and spring.