Abstract
Rice chitinase (chi11) and tobacco osmotin (ap24) genes, which cause disruption of fungal cell wall and cell membrane, respectively, were stacked in transgenic rice to develop resistance against the sheath blight disease. The homozygous marker-free transgenic rice line CoT23 which harboured the rice chi11 transgene was sequentially re-transformed with a second transgene ap24 by co-transformation using an Agrobacterium tumefaciens strain harbouring a single-copy cointegrate vector pGV2260∷pSSJ1 and a multi-copy binary vector pBin19∆nptII-ap24 in the same cell. pGV2260∷pSSJ1 T-DNA carried the hygromycin phosphotransferase (hph) and β-glucuronidase (gus) genes. pBin19∆nptII-ap24 T-DNA harboured the tobacco osmotin (ap24) gene. Co-transformation of the gene of interest (ap24) with the selectable marker gene (SMG, hph) occurred in 12 out of 18 T0 plants (67%). Segregation of hph from ap24 was accomplished in the T1 generation in one (line 11) of the four analysed co-transformed plants. The presence of ap24 and chi11 transgenes and the absence of the hph gene in the SMG-eliminated T1 plants of the line 11 were confirmed by DNA blot analyses. The SMG-free transgenic plants of the line 11 harboured a single copy of the ap24 gene. Homozygous, SMG-free T2 plants of the transgenic line 11 harboured stacked transgenes, chi11 and ap24. Northern blot analysis of the SMG-free plants revealed constitutive expression of chi11 and ap24. The transgenic plants with stacked transgenes displayed high levels of resistance against Rhizoctonia solani. Thus, we demonstrate the development of transgene-stacked and marker-free transgenic rice by sequential Agrobacterium-mediated co-transformation with the same SMG.
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Acknowledgements
We acknowledge Dr Leo S. Melchers, MOGEN international NV, Netherlands, for the ap24 gene. We thank the Department of Biotechnology (DBT), Govt. of India for the research funding to K. Veluthambi and for the Post doctoral fellowship to M. V. Ramana Rao.
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Communicated by H. Ebinuma.
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Ramana Rao, M.V., Parameswari, C., Sripriya, R. et al. Transgene stacking and marker elimination in transgenic rice by sequential Agrobacterium-mediated co-transformation with the same selectable marker gene. Plant Cell Rep 30, 1241–1252 (2011). https://doi.org/10.1007/s00299-011-1033-y
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DOI: https://doi.org/10.1007/s00299-011-1033-y