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Titolo:
BIOCHEMICAL AND PHYSIOLOGICAL DIFFERENCES IN THE MALATHION CARBOXYLESTERASE ACTIVITIES OF MALATHION-SUSCEPTIBLE AND MALATHION-RESISTANT LINES OF THE SHEEP BLOWFLY, LUCILIA-CUPRINA
Autore:
SMYTH KA; WALKER VK; RUSSELL RJ; OAKESHOTT JG;
Indirizzi:
SYRACUSE UNIV,DEPT BIOL,130 COLL PL SYRACUSE NY 13244 CSIRO,DIV ENTOMOL,GPO BOX 1700 CANBERRA ACT 2601 AUSTRALIA AUSTRALIAN NATL UNIV,SCH LIFE SCI,DIV BIOCHEM & MOLEC BIOL CANBERRA ACT 2601 AUSTRALIA QUEENS UNIV,DEPT BIOL KINGSTON ON K7L 3N6 CANADA QUEENS UNIV,INSECT BIOTECH CANADA KINGSTON ON K7L 3N6 CANADA
Titolo Testata:
Pesticide biochemistry and physiology
fascicolo: 1, volume: 54, anno: 1996,
pagine: 48 - 55
SICI:
0048-3575(1996)54:1<48:BAPDIT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
JUVENILE-HORMONE ESTERASE; APHIDS MYZUS-PERSICAE; MUSCA-DOMESTICA L; DROSOPHILA-MELANOGASTER; INSECTICIDE RESISTANCE; ORGANO-PHOSPHORUS; DIPTERA; CALLIPHORIDAE; AMPLIFICATION; LEPIDOPTERA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
K.A. Smyth et al., "BIOCHEMICAL AND PHYSIOLOGICAL DIFFERENCES IN THE MALATHION CARBOXYLESTERASE ACTIVITIES OF MALATHION-SUSCEPTIBLE AND MALATHION-RESISTANT LINES OF THE SHEEP BLOWFLY, LUCILIA-CUPRINA", Pesticide biochemistry and physiology, 54(1), 1996, pp. 48-55

Abstract

Three malathion carboxylesterase (MCE) phenotypes have been describedpreviously in Lucilia cuprina adults: low, intermediate, and high. The MCE specific activities of adults with the intermediate and high phenotypes are 21- and 33-fold higher than those with the low phenotype, but the high phenotype is almost 1000-fold more resistant to malathionthan either of the other phenotypes. Here we show that MCE activity also peaks in Day 4 larvae from three lints representative of these phenotypes. The MCE activity of the low-line larvae is only 2.7- and 4-fold lower than those of the intermediate and high-line larvae, respectively. The relatively high MCE activity of the low-line larvae is largely explained by their crop activity. Assays in the presence of esterase inhibitors reveal three distinct types of MCE activity across the three lines and two developmental stages. Activity in the low-line adults is not completely inhibited by paraoxon and is classified as a subclass II carboxylesterase. The MCE activities in the larvae of the low and intermediate lines and adults from the intermediate line are inhibited by low concentrations of paraoxon, classifying them as subclass I carboxylesterases. The MCE activities in the high-line larvae and adults are also classified as subclass I carboxylesterases, but they are more sensitive to inhibition by triphenyl phosphate than those in the other two lines. These data suggest that MCE in the malathion-resistanthigh line may be structurally different from the MCEs in the malathion-susceptible intermediate and low lines. (C) 1996 Academic Press, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 20:46:22