Expression of a Bacillus thuringiensis toxin (cry1Ab) gene in cabbage (Brassica oleracea L. var. capitata L.) chloroplasts confers high insecticidal efficacy against Plutella xylostella

Theoretical and Applied Genetics - Tập 117 - Trang 75-88 - 2008
Cheng-Wei Liu1, Chin-Chung Lin2, Jinn-Chin Yiu3, Jeremy J. W. Chen2,4, Menq-Jiau Tseng5
1Department of Post-Modern Agriculture, Ming Dao University, Chang Hua, Taiwan ROC
2Institute of Molecular Biology, National Chung-Hsing University, Taichung, Taiwan ROC
3Department of Horticulture, National Ilan University, I-Lan, Taiwan, ROC
4Institute of Biomedical Sciences, National Chung-Hsing University, Taichung, Taiwan ROC
5Department of Horticulture, National Chung-Hsing University, Taichung, Taiwan ROC

Tóm tắt

Chloroplast genetic engineering is an environmentally friendly approach, where the foreign integrated gene is often expressed at a higher level than nuclear transformation. The cry1Ab gene was successfully transferred into the cabbage chloroplast genome in this study. The aadA and cry1Ab genes were inserted into the pASCC201 vector and driven by the prrn promoter. The cabbage-specific plastid vectors were transferred into the chloroplasts of cabbage via particle gun mediated transformation. Regenerated plantlets were selected by their resistance to spectinomycin and streptomycin. According to antibiotic selection, the regeneration percentage of the two cabbage cultivars was 4–5%. The results of PCR, Southern, Northern hybridization and western analyses indicated that the aadA and cry1Ab genes were not only successfully integrated into the chloroplast genome, but functionally expressed at the mRNA and protein level. Expression of Cry1Ab protein was detected in the range of 4.8–11.1% of total soluble protein in transgenic mature leaves of the two species. Insecticidal effects on Plutella xylostella were also demonstrated in cry1Ab transformed cabbage. The objectives of this study were to establish a gene transformation system for Brassica chloroplasts, and to study the possibility for insect-resistance in dicot vegetables using chloroplast gene transformation.

Tài liệu tham khảo

Bhattacharya RC, Viswakarma N, Bhat SR, Kirti PB, Chopra VL (2002) Development of insect-resistant cabbage plants expressing a synthetic cry1Ab gene from Bacillus thuringiensis. Curr Sci 83:146–150

Daniell H. (2002) Gene flow from genetically modified crops: current and future technologies for transgene containment. Nat Biotechnol 20:581–586

Daniell H, Lee SB, Panchal T, Wiebe PO (2001) Expression of cholera toxin B subunit gene and assembly as functional oligomers in transgenic tobacco chloroplasts. J Mol Biol 311:1001–1009

Dhingra AP, Daniell H (2004) Enhanced translation of a chloroplast expressed RbcS gene restores SSU levels and photosynthesis in nuclear antisense RbcS plants. Proc Natl Acad Sci USA 101:6315–6320

Doyle JJ, Doyle JL (1987) A rapid DNA isolation procedure for small quantities of fresh leaf tissue. Phytochem Bull 19:11–15

James C (2006) Global review of commercialized transgenic crops: In: International service for the acquisition of agri-biotech applications (ISAAA, New York)

Kota M, Daniell H, Varma S, Garczynski F, Gould F, Moar WJ (1999) Overexpression of the Bacillus thuringiensis Cry2 A protein in chloroplasts confers resistance to plants against susceptible and Bt-resistant insects. Proc Natl Acad Sci USA 96:1840–1845

Liu CW, Tseng MJ (2005) Development a high-frequency method of plastid transformation in cabbage (Brassica oleracea L. var. capitata L.). Horticulture NCHU 30:27–38

Sugiura M, Hirose T, Sugita M (1998) Evolution and mechanism of translation in chloroplasts. Annu Rev Genet 32:437–459