论文部分内容阅读
寄主植物是影响昆虫抗寒性的主要因子之一。研究了不同温度下甜菜夜蛾Spodoptera exigua(Hübner)3龄幼虫取食小白菜、甘蓝、葱和菠菜后,对过冷却能力和体内冷冻保护剂的影响。结果表明,寄主植物对甜菜夜蛾3龄幼虫的过冷却能力有显著性影响,其中以取食甘蓝的幼虫过冷却点最低。温度和寄主植物对其过冷却点、结冰点和虫体含水量有明显的交互作用。寄主植物对其体内的海藻糖含量有显著性影响,而对甘油和糖原含量没有显著性影响。温度和寄主植物仅对海藻糖含量有显著的交互作用。随着温度的升高,取食不同寄主的幼虫体内海藻糖和糖原含量的变化趋势完全相反,认为海藻糖是由糖原转化而来。研究结果提示冬季合适的寄主植物有利于甜菜夜蛾低龄幼虫越冬。
Host plants are one of the main factors affecting the cold resistance of insects. The effects of feeding on cabbage, cabbage, green onions and spinach with 3rd instar larvae of Spodoptera exigua (Hübner) at different temperatures on overcooling and in vivo cryoprotectants were studied. The results showed that the host plants had a significant effect on the supercooling ability of the 3rd instar larvae of beet armyworm, and the larvae fed on cabbage had the lowest subcooling point. Temperature and host plants had obvious interaction on the subcooling point, freezing point and water body of parasites. Host plants had a significant effect on the amount of trehalose in their body, but had no significant effect on glycerol and glycogen content. Temperature and host plants only have a significant interaction with trehalose content. With the increase of temperature, the changes of trehalose and glycogen contents in larvae fed on different hosts were totally opposite. It is believed that trehalose is transformed from glycogen. The results suggest that suitable winter host suitable for winter beet armyworm larvae wintering.