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The effects of luteolin on phenoloxidase and the growth of Spodotera exigua (Hübner) larvae (Lepidoptera: Noctuidae)
Xue Chaobin,Luo Wanchun *
College of Plant Protection, Key Laboratory of Pesticide Toxicology and Application Technique, Shandong Agricultural University
*Correspondence author
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Funding: China Expert National Ministry of Education Foundation （No.No. 20070434006）
Opened online:21 December 2010
Accepted by: none
Citation: Xue Chaobin,Luo Wanchun.The effects of luteolin on phenoloxidase and the growth of Spodotera exigua (Hübner) larvae (Lepidoptera: Noctuidae)[OL]. [21 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4397554
 
 
The effects of luteolin on phenoloxidase (PO) from Spodotera exigua larvae were investigated with the use of a microtitration assay in the present paper. The results showed that luteolin could inhibit the activity of PO and concentration of this inhibitor that led to a 50% (IC50) activity reduction was estimated to be 0.47 mmol/L. The inhibitory kinetics was analyzed by Lineweaver-Burk plots and the compound was found to be a reversible competitive inhibitor with the Ki of 13.11 mmol/L. The compound was obviously toxic against the larvae (≤3rd instar) of Spodoptera exigua. The highest inhibitory percentage in the older larvae (≥3rd instar) was greater than 60% with luteolin treatment. The pupation rate and percentage of eclosion was also evidently reduced with luteolin treatment by the ingestion method in this investigation.
Keywords:Iluteolin; Spodotera exigua; phenoloxidase; inhibition kinetics
 
 
 

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