Acaricidal and cytotoxic activities of extracts from selected genera of Australian Lamiaceae.
Crude foliar extracts of 67 species from six subfamilies of Australian Lamiaceae were screened by whole organism contact toxicity on the polyphagous mite Tetranychus urticae Koch (Acari: Tetranychidae) by using a Potter precision spray tower. Cytotoxicity assessments against insect cell lines from Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) and Drosophila melanogaster (Meigen) (Diptera: Drosophilidae) also were made. The Spodoptera cell line was more susceptible to extracts than the Drosophila cellline. No direct correlation was observed between the two screening methods, but several interesting relationships were identified. Extracts from subfamilies Ajugoideae, Scutellarioideae, Chloanthoideae, Viticoideae and Nepetoideae showed acaricidal activity, whereas only those from Ajugoideae and Nepetoideae displayed potent cytotoxic effects. A range of activities was observed for the 25 species of Plectranthus, 14 of which showed moderate-to-high contact toxicity against T. urticae. Overall, the lowest toxicity was observed for extracts from the plant subfamily Prostantheroideae, which showed little contact toxicity or cytotoxicity for the 18 extracts studied.
Rasikari
Heidi L
HL
Centre for Phytochemistry and Pharmacology, Southern Cross University, Military Road Lismore, NSW Australia 2780.
Leach
David N
DN
Waterman
Peter G
PG
Spooner-Hart
Robert N
RN
Basta
Albert H
AH
Banbury
Linda K
LK
Forster
Paul I
PI
D000818:Animals; D001315:Australia; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D004331:Drosophila melanogaster / Q000166:cytology; D007306:Insecticides / Q000494:pharmacology; D019686:Lamiaceae / Q000737:chemistry*; D007928:Lethal Dose 50; D010936:Plant Extracts / Q000494:pharmacology; D018411:Spodoptera / Q000166:cytology; D040102:Tetranychidae
D007306:Insecticides; D010936:Plant Extracts