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SUSCEPTIBILITY AND ACTIVITY OF GLUTATHIONE S-TRANSFERASES IN NINE FIELD POPULATIONS OF PANONYCHUS CITRI (ACARI: TETRANYCHIDAE) TO PYRIDABEN AND AZOCYCLOTIN

Jin-Zhi Niu, Guo-Ying Liu, Wei Dou and Jin-Jun Wang
The Florida Entomologist
Vol. 94, No. 2 (June, 2011), pp. 321-329
Stable URL: http://www.jstor.org/stable/23048031
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SUSCEPTIBILITY AND ACTIVITY OF GLUTATHIONE S-TRANSFERASES IN NINE FIELD POPULATIONS OF PANONYCHUS CITRI (ACARI: TETRANYCHIDAE) TO PYRIDABEN AND AZOCYCLOTIN
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Abstract

Nine field collected populations of Panonychus citri from Chinese citrus orchards were assayed for susceptibility to pyridaben and the alternative acaricide azocyclotin and activity of glutathione S-transferases (GSTs). The results showed that populations from Pujiang, Wanzhou, and Pengshan exhibited a low level of sensitivity to pyridaben, but demonstrated a high level of sensitivity to azocyclotin. The correlation coefficient between GSTs activities and the LC50 of pyridaben was r = 0.93 while the correlation coefficient between GSTs activities and the LC50 of azocyclotin was r = 0.03. The Vmax value of CDNB (1-chloro-2, 4-dinitrobenzene) in populations from Beibei, Jintang, Pengshan, Wanzhou, and Zhongxian exhibited a: 2.5-, 11.6-, 7.0-, 5.1-, and 6.4-fold increase in resistance, respectively, relative to the pyridaben susceptible population. In addition, azocyclotin was the most sensitive inhibitor of the GSTs compared with the EA (ethacrynic acid) and pyridaben, based on the values for I50. The current study suggested that GSTs might be involved in resistance of P. citri to pyridaben and but not azocyclotin in the field. Nueve poblaciones de Panonychus citri recolectadas en huertos de cítricos en China fueron analizadas por su susceptibilidad al piridaben y un acaricida alternativo la azociclotina y la actividad de S-transferasa de glutatión (STG). Los resultados mostraron que las poblaciones de P. citri en Pujiang, Wanzhou y Pengshan presentaron un bajo nivel de susceptibilidad al piridaben, pero demostró un alto nivel de susceptibilidad a la azociclotina. El coeficiente de correlación entre las actividades de STG y la CL50 de piridaben fue de r = 0.93, mientras que el coeficiente de correlación entre las actividades de STG y la CL50 de azociclotina fue de r = 0.03. El valor de Vmax del CDNB (1-cloro-2, 4-dinitrobenceno) en las poblaciones de P. citri en Beibei, Jintang, Pengshan, Wanzhou y Zhongxian exhibió un aumento de: 2.5, 11.6, 7.0, 5.1 y 6.4 veces en resistencia, respectivamente, en relación con la población susceptible al piridaben. Además, azociclotina fue el inhibidor más sensible de la STG en comparación con el EA (ácido etacriníco) y piridaben, basado en los valores de I50. El estudio actual sugiere que los STG podrían estar implicados en la resistencia de P. citri al piridaben, pero no a la azociclotina en el campo.

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