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Deadly venom of Asobara japonica parasitoid needs ovarian antidote to regulate host physiology.

Abstract：

:Asobara japonica (Braconidae) is an endophagous parasitoid developing in Drosophila larvae. The present study shows that A. japonica was never encapsulated in Drosophila melanogaster, and that it caused an overall inhibition of the host encapsulation reaction since injected foreign bodies were never encapsulated in parasitized hosts. Both the number of circulating hemocytes and the phenoloxidase activity decreased in parasitized larvae, and the hematopoietic organ appeared highly disrupted. We also found that A. japonica venom secretions had atypical effects on hosts compared to other braconid wasps. A. japonica venom secretions induced permanent paralysis followed by death of D. melanogaster larvae, whether injected by the female wasp during an interrupted oviposition, or manually injected into unparasitized larvae. More remarkably, these effects could be reversed by injection of ovarian extracts from female wasps. This is the first report that the venom of an endophagous braconid parasitoid can have a deadly effect on hosts, and moreover, that ovarian extracts can act as an antidote to reverse the effects of the wasp's venom. These results also demonstrate that A. japonica secretions from both venom gland and ovary are required to regulate synergistically the host physiology for the success of the parasitoid.

journal_name

J Insect Physiol

journal_title

Journal of insect physiology

authors

Mabiala-Moundoungou AD,Doury G,Eslin P,Cherqui A,Prévost G

doi

10.1016/j.jinsphys.2009.09.001

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

35-41

issue

1

eissn

0022-1910

issn

1879-1611

pii

S0022-1910(09)00314-X

journal_volume

56

pub_type

杂志文章

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