Derris(Lonchocarpus) urucu (Leguminosae) estract modifies the peritrophic structure of Aedes aegypti (Diptera: Culidae
Mem. Inst. Oswaldo Cruz
;
97(3): 371-375, Apr. 2002.
Article
in English
| LILACS
| ID: lil-307987
ABSTRACT
Aqueous suspension of ethanol extracts of Derris (Lochocarpus) urucu (Leguminosae), collected in the state of Amazonas, Brazil, were tested for larvicidal activity against the mosquito Aedes aegypti (DipteraCulicidae). the aim of this study was to observe the alterations of peritrophic matrix in Ae. aegypti larvae treated with an aqueous suspension of D. urucu extract. Different concentrations of D. urucu root extract were tested against fourth instar larvae. One hundred percent mortality was observed at 150 microg/ml (LC(50) 17.6 microg/ml) 24 h following treatment. In response to D. urucu feeding, larvae excreted a large amount of amorphous feces, while control larvae did not produce feces during the assay period. Ultrastructural studies showed tha larvae fed with 150 microg/ml of D. urucu extract for 4 h have an imperfect peritrophic matrix and extensive damage of the midgut epithelium. Data indicate a protective role for the peritrophic matrix. The structural modification of the peritrophic matrix is intrinsically associated with larval mortality.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Aedes
/
Fabaceae
Limits:
Animals
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2002
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual do Norte Fluminense/BR
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