Abstract
Plant viruses continue to cause diseases on economically important crops. Therefore, numerous attempts to produce virus resistant plants have been reported by using the mechanisms such as host mediated protection and virus mediated protection. Here, a novel strategy of targeting viral RNA itself, rather than viral gene products, is presented to generate virus-resistant transgenic plants. A catalytic single chain variable antibody, 3D8 scFv, which has RNase activities, was functionally expressed in the cytosol of Nicotiana tabacum. We found that progenies of the transgenic tobacco plant acquired complete resistances against four ss-RNA tobamoviruses and one cucumovirus tested without viral accumulation and delayed onset of disease symptoms. The results showed that the resistance observed in 3D8 scFv transgenic plants was caused by the RNase activity of 3D8 scFv itself, not by RNA-mediated gene silencing mechanism. Taken together, we suggested that newly gained resistance of the 3D8 scFv transgenic plants to five ss-RNA viruses most likely resulted from the RNase activity of 3D8 scFv.
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This study was supported by a grant from the Next Generation BioGreen21 program (No. PJ0079842012) from the Rural Development Administration (RDA) and the Korea Institute of Ocean Science and Technology project (No. PE99154) of Korea.
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Gunsup Lee, Hye-Kyung Shim and Myung-Hee Kwon have contributed equally to this work.
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Lee, G., Shim, HK., Kwon, MH. et al. RNA virus accumulation is inhibited by ribonuclease activity of 3D8 scFv in transgenic Nicotiana tabacum . Plant Cell Tiss Organ Cult 115, 189–197 (2013). https://doi.org/10.1007/s11240-013-0351-x
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DOI: https://doi.org/10.1007/s11240-013-0351-x