铅胁迫对斜纹夜蛾生长发育与生殖的影响

在植食性昆虫斜纹夜蛾幼虫标准人工饲料中添加不同浓度的重金属铅(Pb),研究Pb胁迫对其生长发育与生殖的影响.结果表明:斜纹夜蛾不同发育阶段(幼虫、蛹和成虫)的存活率和体质量随着饲料中Pb浓度的增加而下降,引起存活率显著下降的最低Pb胁迫浓度是100 mg·kg-1,引起体质量显著减少的最低Pb胁迫浓度是50 mg·kg-1.在取食Pb浓度为25～ 200 mg·kg-1的人工饲料后,斜纹夜蛾成虫的产卵天数显著减少；产卵力和生育力随着饲料中Pb浓度的增加而显著下降；1000粒卵的平均质量显著低于对照；卵孵化率显著下降.重金属Pb胁迫对斜纹夜蛾生长发育和生殖具有显著的抑制作用.

Effects of lead stress on the growth and reproduction of Spodoptera litura fabricius (Lepidoptera:Noctuidae)

Abstract: Standard artificial diet was added with different concentration lead (Pb) to feed herbivorous insect Spodoptera litura larvae to study their growth and reproduction under the effects of Pb stress. With the increasing concentration Pb in the diet, the survival rate and body mass of the larvae at their different development stages (larvae, pupae, and adults) decreased. The minimum concentration of Pb which caused the significant decrease of the survival rate was 100 mg x kg(-1), and that caused a remarkable decrease of body mass was 50 mg x kg(-1). After fed with the diet containing 25-200 mg x kg(-1) of Pb, the duration of laying eggs was significantly shortened. With increasing concentration Pb in the diet, the oviposition rate and fecundity of female adults decreased significantly, the average mass of one thousand eggs was significantly less than that of the control, and the hatching rate of the eggs laid by adults was also decreased significantly. All the results suggested that Pb stress had significant inhibition effects on the growth and reproduction of S. litura.