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A COMPARISON OF SENSITIVITY TO INHIBITOR AMONG ACETYLCHOLINESTERASE (AChE) MOLECULAR FORMS OF RESISTANT AND SUSCEPTIBLE STRAINS IN HELICOVERPA ARMIGERA *
Author(s) -
Xiwu GAO,
Xuguo ZHOU,
Bingzong ZHENG
Publication year - 2001
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1744-7917.2001.tb00434.x
Subject(s) - helicoverpa armigera , acetylcholinesterase , aché , biology , organophosphate , carbamate , strain (injury) , larva , toxicology , bollworm , botany , enzyme , biochemistry , pesticide , anatomy , agronomy
The sensitivity of 2.8s and 8.7s acetylcholinesterase (AChE) to eserine sulfate is significantly lower in resistant (R) strain than in susceptible (S) strain in five AChE forms isolated by sucrose gradient centrifugation from cotton bollworm, Helicoverpa armigera . There are 186 and 85 times of difference in heads of adults and 10 10 and 10 5 times of difference in heads of larvae based on a comparison of I 50 values for 2.8s and 8.7s forms respectively. The sensitivity of 5.3s form of AChE to eserine sulfate shows 123 times of difference between R and S strains in larvae, however no difference in adults. The above results indicate that insensitive 2.8s, 8.7s and 5.3s forms of AChE may play an important role in the resistance of cotton boll‐worm to organophosphate and carbamate insecticides.