| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2009593 | Pesticide Biochemistry and Physiology | 2012 | 6 Pages |
The brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae), is a classic example of a pest that experiences insecticide-induced fecundity. The insecticides indoxacarb and chlorantraniliprole were recently developed with high insecticidal activity in the control of rice yellow stem borer, Tryporyza incertulas (walker) and rice leaffolder, Cnaphalocrocis medinalis (Guenee). We examined the changes in the fecundity of N. lugens, the vitellogenin (Nlvg) gene expression and the vitellin contents of adult females exposed to these new insecticides. Our findings showed that indoxacarb and chlorantraniliprole significantly suppressed the fecundity of the females and the expression of Nlvg mRNA. Treatment with 10, 20, 40 and 80 mg/L indoxacarb decreased Nlvg mRNA expression by 35.4%, 74.4%, 79.6% and 61.9%, respectively, and treatment with 7.5, 15, 30, 60 and 80 mg/L chlorantraniliprole decreased Nlvg mRNA expression by 79.3%, 40.2%, 40.0%, 79.8% and 51.8%, respectively. The vitellin contents in both the ovaries and fat bodies of the adult females also decreased, indicating that the two insecticides suppressed the synthesis of vitellin in the fat bodies and the transfer of vitellin to the ovaries. This decrease in the vitellin contents of the ovaries may be attributed to the low Nlvg expression, as there was a positive correlation between the vitellin content and the expression of this gene, indicating that these insecticides influenced the fecundity of N. lugens by affecting the expression of Nlvg mRNA. The study of the effects of indoxacarb and chlorantraniliprole on fecundity should have significance for the wide usage in rice plants.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Indoxacarb and chlorantraniliprole were recently developed insecticides. ► Sub-lethal dosages suppressed the fecundity of the females of Nilaparvata lugens. ► The expression of Nlvg mRNA was significantly suppressed. ► The vitellin contents in the fat bodies and ovaries decreased. ► The effects should have significance for the usage in rice plants.
