Abstract
The advantages of gene ‘stacking’ or ‘pyramiding’ are obvious in genetically modified (GM) crops, and several different multi-transgene-stacking methods are available. Using linker peptides for multiple gene transformation is considered to be a good method to meet a variety of needs. In our experiment, the Bt cry1Ah gene, which encodes the insect-resistance protein, and the mG 2 -epsps gene, which encodes the glyphosate-tolerance protein, were connected by a 2A or LP4/2A linker. Linker 2A is a peptide from the foot-and-mouth disease virus (FMDV) that has self-cleavage activity. LP4 is a peptide from Raphanus sativus seeds that has a recognition site and is cleaved by a protease. LP4/2A is a hybrid peptide that contains the first 9 amino acids of LP4 and 20 amino acids from 2A. We used the linker peptide to construct four coordinated expression vectors: pHAG, pHLAG, pGAH and pGLAH. Two single gene expression vectors, pSAh and pSmG2, were used as controls. The six expression vectors and the pCAMBIA2301 vector were transferred into tobacco by Agrobacterium tumefaciens-mediated transformation, and 529 transformants were obtained. Molecular detection and bioassay detection data demonstrated that the transgenic tobaccos possessed good pest resistance and glyphosate tolerance. The two genes in the fusion vector were expressed simultaneously. The plants with the genes linked by the LP4/2A peptide showed better pest resistance and glyphosate tolerance than the plants with the genes linked by 2A. The expression level of the two genes linked by LP4/2A was not significantly different from the single gene vector.
Key message The expression level of the two genes linked by LP4/2A was higher than those linked by 2A and was not significantly different from the single gene vector.
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Acknowledgments
The authors are very grateful to Dr. Liang Gemei at the Institute of Plant Protection, CAAS for test larvae supply and bioassay help. This work was supported by the National Natural Science Foundation of China (Grant No. 30771383)
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Communicated by K. Chong.
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Sun, H., Lang, Z., Zhu, L. et al. Acquiring transgenic tobacco plants with insect resistance and glyphosate tolerance by fusion gene transformation. Plant Cell Rep 31, 1877–1887 (2012). https://doi.org/10.1007/s00299-012-1301-5
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DOI: https://doi.org/10.1007/s00299-012-1301-5