Abstract
The susceptibility of rice lines, T1C-19, T2A-1, and MH63 to SRBSDV infection are similar and the contents of cry protein in T2A-1 and T1C-19 do not change significantly. The survival rates of BPH nymphs feeding on SRBSDV-infected T1C-19, Bt T2A-1, or MH63 rice plants were not significantly different. The developmental stages of female BPH fed on T1C-19 plants infected with SRBSDV were significantly shorter than those fed on uninfected rice, while the males showed no significant difference. The duration of BPH feeding on SRBSDV-infected T2A-1 and MH63 also showed no significant difference in comparison with the respective control groups. Longevities of BPH adults feeding on SRBSDV-infected T1C-19, T2A-1 or MH63 were also not significant. However, the longevity of male adult BPH feeding on un-infected MH63 was significantly reduced in comparison with that of adult males feeding on un-infected T1C-19 and T2A-1 rice. In addition, the different rice lines and the rice plants infected and uninfected with SRBSDV did not significantly affect the sex ratio, female body weight, longevity, fecundity, or egg hatchability of BPH. In general, transgenic Bt rice infected with SRBSDV had little effect on the ecological adaptability of BPH.
Highlights
Cultivating and using insect-resistant rice varieties is an economical, safe and effective method of controlling insect pests
SRBSDV infection had no significant effects on the Cry protein content of transgenic Bt rice lines T2A-1 and T1C-19 (Table 2)
The results of our experiments showed that the infection rate of SRBSDV was not significantly different among Bt rice lines T1C-19 and T2A-1 and non-transgenic parental rice MH63
Summary
Cultivating and using insect-resistant rice varieties is an economical, safe and effective method of controlling insect pests. Most transgenic Bt rice strains show high insecticidal activity against Chilo suppressalis, Tryporyza incertulas, and Cnaphalocrocis medinalis[2, 4, 5]. Ecological risks, such as the effects of transgenic rice on non-target arthropods have received considerable attention. Diffusion experiments of rice planthoppers and leafhoppers in Bt rice and control rice fields showed that they did not show preference for Bt rice and Bt rice did not cause populations of non-target pests to increase[7]. 11.83 ± 0.15aB that populations of Chilo suppressalis and Cnaphalocrocis medinalis decreased in transgenic Bt “Shanyou 63” rice fields, but rice planthoppers and leafhoppers became the main pests.
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