伽马射线辐照拟长毛钝绥螨雄螨对雌螨产卵量和后代雌性比的影响

本文通过伽马射线辐照拟长毛钝绥螨的雄成螨,探讨辐照的雄成螨与雌成螨交配后,对雌成螨产卵量和后代性比的影响。在高辐照剂量10、20、40、80、160、320、640、1280 Gy和剂量率3 Gy.min-1的伽马射线辐照下,雌螨的产卵量随辐照剂量的增加而逐渐减少。40 Gy及以上的辐照剂量雌螨产卵量与对照相比均有显著差异;后代雌性比也随辐照剂量的增加而降低,到160 Gy辐照剂量时雌性比为0。在低辐照剂量40、160、640、2560和10240 mGy以及剂量率40 mGy.min-1的伽马射线辐照下,雌螨的产卵量随辐照剂量的增加呈现出先升后降的趋势,在160 mGy辐照剂量下达到了最高。160 mGy时后代雌性比也最高,达到72.52%,与40、640、2560mGy处理间没有显著差异,但都显著地高于对照（65.23%）和10240 mGy辐照处理（56.14%）的雌性比。

Effect of Gamma Ray Irradiated Male Adult on Oviposition and Sex Ratio of Offspring of the Predatory Mites Amblyseius pseudolongispinosus

Female fecundity and sex ratios of offspring of Amblyseius pseudolongispinosus were investigated to determine the effects of mating with adult males irradiated with gamma ray. The result showed that at the irradiation doses of 10, 20, 40, 80, 160, 320, 640 and 1280 Gy and ratio of dose of 3 Gy.min-1, number of eggs laid decreased gradually with increase in the irradiation dose. From the irradiation dose of 40 Gy on, there were significant differences in the number of eggs laid between females mated to irradiated males and the control males. Female ratio in offspring was also reduced with increase in radiation dose. At the radiation dose of 160 Gy, there was no female in offspring. While at low radiation doses of 40, 160, 640, 2560 and 10240 mGy and dose rate of 40 mGy.min-1, number of eggs laid increased with increase in irradiation dose, reached the highest （53.80） at the irradiation dose of 160 mGy, and then decreased with further increase in irradiation dose. Female ratios showed the same tendency. At irradiation dose of 160 mGy, female ratio reached 72.52%, which was significantly higher than those in control （65.23%） and at the irradiation dose of 10240 （56.14%）.