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Depressed Performance and Detoxification Enzyme Activities of Helicoverpa armigera Fed by Conventional Cotton Foliage Subjected to Methyl Jasmonate Exposure
YANG Shiyong 1 * #,WU Huihui 2,XIE Jianchun 3
1.School of Life Sciences, Anhui Normal University, AnHui WuHu 241000
2.School of Life Sciences, Anhui Normal University, Wuhu 241000
3.School of Environmen Sciences and Engineering, Wuhu 241000
*Correspondence author
#Submitted by
Subject:
Funding: Natural Science Foundation of China （No.No. 31070338）, Research Fund for the Doctoral Program of Higher Education of China （No.No. 20093424120002）, Science and Technological Fund of Anhui Province for Outstanding Youth （No.No. 1108085J07）
Opened online:11 January 2013
Accepted by: none
Citation: YANG Shiyong,WU Huihui,XIE Jianchun.Depressed Performance and Detoxification Enzyme Activities of Helicoverpa armigera Fed by Conventional Cotton Foliage Subjected to Methyl Jasmonate Exposure[OL]. [11 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4511414
 
 
Methyl jasmonate (MeJA)-mediated defense in conventional cotton (Gossypium hirsutum L.) against Helicoverpa armigera (cotton bollworm) was investigated with respect to the activities of the detoxification enzymes, acetylcholinesterase (AChE), carboxylesterase (CarE) and glutathione S-transferases (GST) in pupae, as well as the performance of larvae. The results suggested that exogenous application of MeJA to cotton leaves depressed the activities of AChE, CarE and GST of cotton bollworm pupae. Both the absolute and specific AChE activities of pupae were depressed at any MeJA concentration applied as compared with control, and the effects of 0.4 mM MeJA was significantly higher than the two other concentrations tested, i.e. 0.1 mM and 0.2 mM. A marked reduction of absolute CarE activity was observed at the 0.4 mM MeJA concentration whereas the specific activity was increased by the 0.2 mM and 0.4 mM concentrations. The Absolute GST activity was significantly depressed only by the 0.4 mM MeJA treatment. Protein content of pupae was markedly reduced by 0.4 mM MeJA-induced defense in cotton leaves. The development time of larvae was protracted and pupae weight was reduced by both 0.1 mM and 0.4 mM MeJA-treated cotton leaves. Larval weight gain was inhibited significantly by both 0.2 mM and 0.4 mM MeJA-treated cotton leaves. The results suggested that MeJA-induced plant defense may have adverse effects on H. armigera when the pest feds on MeJA-treated plants. In addition to the inhibition of growth and development, induced defense may also impair insect's ability to detoxify toxic plant secondary metabolites.
Keywords:pest control; induced defense; cotton bollworm; relative growth rate; development time; plant growth regulator
 
 
 

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