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Evaluation of Impact of Pollen Grains from Bt, Bt/CpTI Transgenic Cotton and Bt Corn Plants on the Growth and Development of the Mulberry Silkworm, Bombyx mori Linnaeus (Lepidoptera: Bombycidae) |
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| Authors: | LI Wen-Dong YE Gong-Yin WU Kong-ming WANG Xiao-Qi GUO Yu-yuan |
| Institution: | 1. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, P.R.China;College of Plant Protection, Shenyang Agricultural University, Shenyang 110161, P.R.China 2. Institute of Applied Entomology, Zhejiang University, Hangzhou 310029, P.R.China 3. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, P.R.China 4. College of Plant Protection, Shenyang Agricultural University, Shenyang 110161, P.R.China |
| Abstract: | The δ-endotoxin genes of Bacillus thuringiensis (Bt) and proteinase inhibitor (PI) genes aretwo kinds of genes popularly used for developing transgenic plants resistant to insect pests. To clarify whetherthere is any risk concerning the effects of pollens from these transgenic crops on non-target insects with eco-nomic importance, such as the effects on the growth and development as well as cocoon quality of the silk-worm, Bombyx mori Linnaeus, a series of feeding experiments were conducted, using pollens from transgeniccotton or corn containing crylAc, cry1A+-CpTI or crylAb genes, compared with pollens from non-transgenicnormal cotton and corn as well as the non-pollen treatment. In contrast to the latter ones, pollens from trans-genic plants showed no significant adverse effects on larval mortality, cocoon weight, pupa weight, cocoonshell weight, pupation rate, emergence rate and fecundity of the silkworm after neonates were fed with thepollens for 72 h. In addition, no dosage effects of pollens were found. Though the duration of 1st instar larvaewas prolonged in the case of feeding with transgenic pollens as compared with those of the non-pollen treat-ment, but they were not significantly different from those fed with pollens from non-transgenic cotton or corn.Meanwhile, the body weight of the 3rd instar molters fed with transgenic pollens was obviously different fromthose for non-pollen treatment, and was all significantly heavier than that of the controls. Consequently, it isconsidered that the adverse effect of pollens from transgenic insect-resistant cotton and corn on the growth anddevelopment of the silkworm is negligible. |
| Keywords: | Bt/CpTI transgenic cotton Bt transgenic corn Pollen Bombyx mori Growth and develop-ment |
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