Abstract
ABSTRACT The whitefly Bemisia tabaci (Gennadius), a major pest of protected and outdoor crops worldwide, has developed resistance to a wide range of insecticides including organophosphates (OPs) and carbamates (CBs). The biochemical target of OPs and CBs is acetylcholinesterase (AChE). The objective of this study was to optimize AChE bioassay conditions including enzyme concentration, substrate concentration, pH, temperature and reaction time in order to quickly and accurately monitor specific activity of AChE and monitor resistance of B. tabaci to insecticides. The results of an orthogonal array test showed that the optimum combination of levels was A3B3C4D5E1 in which the enzyme concentration was 20 adults/mL, substrate concentration was 7.0 × 10-4 mol/L, pH was 7.5, temperature was 45 °C, and reaction time was 5 min. The specific activity of AChE from B Biotype B. tabaci was 41.23 nmol · min-1 · mg-1 under this set of conditions. This optimum combination proved to be reliable and accurate for testing t...
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