Effect of airborne SO_2 on performance of the turnip moth,Agrotis segetum Schiff

Effect of SO_2-enriched air on the turnip moth, Agrotis segetum Schiff.was investigated by rearing the larvae on rape leaves that had been exposed to 40 or 80 ppb of the air pollutant in field fumigation chambers. An examination on the 11th day showed that the larvae in both treatments survived more, developed markedly faster, their fresh v/eig'ht and mean relative growth rate were significantly greater than those of control insect. Improvement of their growth and development resulted in decrease of total larval duration by 0.5 - 1.0 day. Pupal and adult performances were little affected by SO2 level to which larval food plant was exposed. Possible reason responsible for enhanced growth and development of the insect species was discussed.

Agrotis segetum雄蛾触角叶性信息素反应神经元对电刺激触角神经的反应

为探讨电刺激Agrotissegetum雄蛾触角神经是否可以作为MGC中神经元的识别手段 ,采用细胞内电生理记录方法 ,共记录 34个对性信息素有反应的MGC神经元 ,并测试了其中 12个神经元对性信息素刺激的反应 ,2 2个神经元对性信息素刺激和电刺激的反应。结果表明 ,MGC神经元对性信息素及电刺激的反应模式基本一致 ,为一种双相反应模式。两种刺激方式均能诱导出兴奋反应 ,电刺激得到的兴奋反应比由性信息素刺激引起的要短 ;MGC神经元对两种刺激的超极化反应 (抑制反应 )幅度影响没有显著性差别 ,在电刺激实验的2 2个神经元上 ,超极化反应幅度和抑制时间都与神经元本身放电频率有一定的相关性。超极化反应是在LN参与下一定的神经回路对刺激所产生的反应而形成的 ,这提示两种刺激所作用的神经回路应是一致的 ,但从整个实验过程记录到的神经元情况来看 。