【摘要】 过寄生、寄生时寄主龄期和寄生后寄主饥饿处理影响菜蛾盘绒茧蜂Cotesiaplutellae(Kurdj.)幼蜂及畸形细胞的发育。显微解剖和观察表明,4龄小菜蛾PlutellaxylostellaL.幼虫被寄生后,其体内菜蛾盘绒茧蜂幼蜂发育不整齐、假寄生比例增高。过寄生后,每头被寄生的寄主血腔中畸形细胞数量明显增多,但直径变小;随着过寄生程度的加剧,幼蜂发育严重受阻。寄主营养显著影响体内幼蜂及畸形细胞的发育,被寄生的小菜蛾经饥饿处理62h后,体内畸形细胞的数量、活性明显降低,与此同时,幼蜂的发育也受到明显抑制,寄主发育与寄生蜂和畸形细胞的发育呈正相关性。由此可见,寄主不同龄期、过寄生及寄主营养状况均对寄主体内幼蜂和畸形细胞发育产生影响。更多还原

【Abstract】 The host Plutella xylostella L._parasitoid Cotesia plutellae (Kurdj.) system was used to study the effects of superparasitism, host age at the time of oviposition and host starvation after parasitism on the growth of the parasitoid larvae and their teratocytes in host larvae. The results showed that the percentage of pseudoparasitism increased and the developmental duration of parasitoid larvae was variable when the 4th instar host larvae were parasitized as compared to those when the 2nd and 3rd instar larvae parasitized. More teratocytes were present in host haemocoel with their diameters distinctly decreased after the host larvae were superparasitized as compared to those normally parasitized only once, and the growth of parasitoid larvae was obviously stunted with the increase of degree of superparasitism. After the parasitized host larvae were starved for 62 h, the number of teratocytes decreased and the activity of teratocytes was reduced in the host larvae, and the growth of parasitoid was also arrested at the same time, suggesting that there is a positive interaction relationship among the growth of host larvae, parasitoids and teratocytes. These results indicated that superparasitism, host age at the time of oviposition and host nutritional status after parasitism had obvious effects on the growth of the parasitoid larvae and their teratocytes in host larvae.更多还原