The predatory mirid bug, Reuter, feeds on brown planthopper (BPH) eggs that are deposited on rice and gramineous plants surrounding rice fields. The development and reproduction of are inhibited by feeding on BPH eggs from gramineous species, and the underlining regulatory mechanism for this phenomenon is unclear. In the present study, HPLC-MS/MS analysis revealed that the concentrations of six amino acids (AAs:Ala, Arg, Ser, Lys, Thr, and Pro) were significantly higher in rice than in five gramineous species. When fed on gramineous plants with BPH eggs, expression of several genes in the target of rapamycin (TOR) pathway (, , and ) were significantly lower than that in the insects fed on rice plants with BPH eggs. Treatment of females with rapamycin, dsRheb, dsTOR, or dsS6K caused a decrease in , , and expression, and these effects were partially rescued by the juvenile hormone (JH) analog, methoprene. Dietary dsTOR treatment significantly influenced a number of physiological parameters and resulted in impaired predatory capacity, fecundity, and population growth. This study indicates that these six AAs play an important role in the mediated-TOR pathway, which in turn regulates vitellogenin (Vg) synthesis, reproduction, and population growth in .
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| http://dx.doi.org/10.3389/fphys.2020.617237 | DOI Listing |
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Article Synopsis
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