Abstract
The potential risks of Bt rice on non-target arthropods (NTAs) should be evaluated and defined before commercial production. Recently, effects of Bt rice on NTAs under abiotic and biotic stress conditions attracted much attention. Here we reported the effects of Bt rice T1C-19 (Cry1C rice) on the non-target herbivore, Nilaparvata lugens (rice brown planthopper, BPH) with or without RDV (rice dwarf virus) infection conditions. BPH showed no feeding and oviposition preference between Bt rice T1C-19 and its non-Bt parental rice Minghui 63 (MH63), as well as between RDV-infected and RDV-free rice plants. Meanwhile, rice type, RDV infection status, and their interaction had little impacts on the survival, development and fecundity of BPH. By comparison with non-Bt control, Bt rice T1C-19 with or without RDV infection had no significant effects on the life-table parameters of BPH including rm, R0, T, DT and λ. Thus, it could be concluded that Bt rice T1C-19 doesn’t affect the ecological fitness of BPH either under RDV stress or not.
Highlights
The potential risks of Bacillus thuringiensis (Bt) rice on non-target arthropods (NTAs) should be evaluated and defined before commercial production
Rice black streak dwarf virus (RBSDV) infection induced the increment of amino acids and soluble sugar in rice plants, and these changed metabolites improved the ecological fitness of the non-vector BPH17
Feeding and oviposition preference of brown planthopper (BPH) were investigated in homemade plastic cages in pairs independently (MH63 vs T1C-19, Minghui 63 (MH63)-Rice dwarf virus (RDV) vs T1C-19-RDV, MH63 vs MH63-RDV, T1C-19 vs T1C-19-RDV)
Summary
The potential risks of Bt rice on non-target arthropods (NTAs) should be evaluated and defined before commercial production. We reported the effects of Bt rice T1C-19 (Cry1C rice) on the non-target herbivore, Nilaparvata lugens (rice brown planthopper, BPH) with or without RDV (rice dwarf virus) infection conditions. A range of studies have been done with different Bt rice lines on various NTAs. For most cases, no significant impacts were found on NTAs. Zero effect of Bt rice lines including TT51 (Cry1Ab/Cry1Ac rice), T1C-19 (Cry1C rice) and T2A-1 (Cry2A rice) was found on the survival, development and fecundity of rice brown planthopper (BPH) Nilaparvata lugens (Hemiptera: Delphacidae), and on physiological processes of digestion, detoxification and immune responses of B PH5. Main biological parameters of vector insect GRLHs such as egg hatching rate, nymph survival and female fecundity were not affected by RDV (rice dwarf virus)-infected T1C-19 and T2A-119
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