Abstract：
:The hymenopteran Macrocentrus cingulum usually deposits one egg into the larval body cavity of lepidopteran Ostrinia furnacalis, and the egg subsequently splits into several dozens of embryos during its development. How the parasitoid eggs and embryos avoid encapsulation by the host's immune response remains unknown. We compared hemocyte counts, morphologies and behaviors between unparasitized O. furnacalis larvae, and larvae parasitized by M. cingulum. No distinct differences were observed. Sephadex A-25 beads elicited a strong encapsulation response when injected into the parasitized host larvae, which indicates that parasitism by M. cingulum does not affect host's cellular immunity. However, there were significant differences in the host's encapsulation reactions towards injected eggs from different sources. Injected M. cingulum mature eggs excised from the lateral oviducts of the female wasps were not encapsulated, while immature eggs or driselase treated mature ones provoked an encapsulation response within 2 h after injection. Inspection of eggs by transmission electron microscopy revealed that the driselase collapsed the surface fibrous layer of the eggs, indicating that surface fibrous layer may play a role in protecting eggs from host's immune attack.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Hu J,Zhu XX,Fu WJdoi
10.1016/s0022-1910(03)00021-0keywords:
subject
Has Abstractpub_date
2003-04-01 00:00:00pages
367-75issue
4eissn
0022-1910issn
1879-1611pii
S0022191003000210journal_volume
49pub_type
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