飞行对粘虫体内甘油酯积累与咽侧体活性的影响

Influences of flight on energetic reserves and juvenile hormone synthesis by corpora allata of the oriental armyworm, Mythimna separata (Walker)

研究了粘虫Mythimna separata(Walker)成虫飞行对甘油酯的恢复、保幼激素的滴度及飞行肌降解的影响,结果表明,不同日龄粘虫的飞行活动对其能源物质的积累及保幼激素分泌产生不同的影响.1日龄蛾的飞行对粘虫这两方面产生的影响最大,其飞行个体能源物质的积累明显高于未飞行的对照个体;3日龄飞行个体的能源物质积累与对照相当;但5日龄飞行个体则很难达到对照水平.1日龄飞行个体咽侧体活性在36 h后明显高于对照,60h后已是对照的10倍,108 h达到其峰值;3日龄飞行个体咽侧体的活性稍高于对照,但差别不显著;5日龄飞行个体的咽侧体活性则稍低于对照.不同日龄飞行对飞行肌的降解也产生不同的影响.1日龄飞行个体的飞行肌在飞行后6天已经明显低于对照.3、5日龄的飞行活动对其飞行肌降解的影响不明显.因此推测,粘虫咽侧体活化的关键时期可能在羽化后1～3天之间.

The energetic reserves, juvenile hormone (JH) synthesis by corpora allata and breakdown of indirect flight muscles of the migratory oriental armyworm moth, Mythimna separata (Walker), as influenced by tethered flight at different days were assayed in the laboratory. The regeneration of energetic reserves of the moths flown for 12 hours on the 1st day after emergence was significantly higher than the unflown ones. The energetic reserves of the treatments flown for 12 hours on the 3rd day after emergence were lower than that of the control, but the difference was not significant. Moths flown for 12 hours on the 5th day after emergence displayed lower energetic reserves than that of the control throughout the test period. Differences in JH biosynthesis rates in female moths flown on different days after emergence were confirmed by the radiochemical assay. JH biosynthesis rates in female moths flown on the 1st day was higher than that of the control after 36 hours, and then underwent a sharp increase, peaked after 108 hours. On the 5th day after emergence, JH biosynthesis rates in flown females were lower than that of the control, but not significantly. The flight muscle of female flown 12 hours on the 1st day after emergence degenerated prior to that of the control. Therefore, the 1st to 3rd day in adult armyworm could be considered to be the critical period for activation of the corpora allata.