甜菜夜蛾能源物质积累及其飞行能耗与动态

针对甜菜夜蛾迁飞危害规律及其飞行相关的生理学尚缺乏深入研究的现状,采用吊飞试验及相关生理生化的方法,研究了成虫甘油酯和糖原积累的时间动态及不同日龄成虫飞行后能源物质的变化.结果显示,2日龄蛾虫体干重最高.羽化后2～5日龄雄蛾甘油酯含量显著高于初羽化雄蛾;雌蛾甘油酯积累与雄蛾类似,只有4日龄雌蛾甘油酯含量明显降低.雌蛾糖原含量从初羽化到2日龄急剧升高,然后逐日下降,5日龄又有所回升;雄蛾羽化后到1日龄糖原含量迅速升高,以后的日龄有所波动.不同日龄蛾飞行能源物质的消耗不同.2日龄的成虫飞行,糖类和脂类都有明显的消耗;1、4日龄飞行对糖类的消耗影响不明显.除1日龄雌蛾以外,1、4日龄成虫甘油酯都明显消耗.综合所获结果可以看出,甜菜夜蛾的飞行既能利用脂类,也能利用糖类作为飞行能源,甘油酯是甜菜夜蛾贮备和飞行的主要能源物质.

Dynamics of energy reserves and utilization after tethered-flight in the beet armyworm, Spodoptera exigua (H(u)bner) ( Lepidoptera: Noctuidae)

Dynamics of energy reserves and utilization after flight in the beet armyworm,Spodoptera exigua, were investigated.Dry body weights were highest on day 2 after emergence.Glyceride level in the newly e- merged males was significantly lower than that of males of days 2-5 after emergence;glyceride contents in fe- males shared a similar trend to that of males except that glyceride content on day 4 was significantly lower than those of other days.Glycogen contents in females increased sharply from newly emergence to day 2 and then decreased slowly but increased again at day 5.In males,glycogen contents increased rapidly from emergence to day 1,and then fluctuated on the subsequent days.Consumption of energy reserves during flight differed between different days after emergence.Flights on day 2 after emergence utilized a significant amount of glyc- eride and glycogen.But a 48h tethered-flight starting from day 1 or day 4 consumed an insignificant amount of glycogen,meanwhile,a 48h tethered-flight starting from day 1 or day 4 consumed a significant amount of glyc- eride except for females starting flight on day 1.These results showed that the beet armyworm can use both glyceride and glycogen as fuel for its flight.