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A multi-generation analysis of the stability of transgenic virus resistance in doubled-haploid tobacco lines

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Abstract

Plants can be genetically engineered for virus resistance by transformation with a viral gene. We transformed tobacco with the tomato spotted wilt virus (TSWV) nucleocapsid gene from the Hawaiian L isolate in order to obtain TSWV resistant breeding lines. Doubled-haploid lines were produced from primary transgenic plants that were selected for resistance to the virus. Several of these lines showed very high levels of resistance and were symptomless after inoculation with the Hawaiian L isolate of TSWV. The accumulation of only low levels of full-length transgene RNA and protein observed in these lines is consistent with an RNA-mediated mechanism of resistance. The lines that were highly resistant to the Hawaiian L isolate of TSWV were also found to be highly resistant to several other isolates of TSWV, while lines that were only moderately resistant to the Hawaiian L isolate were often susceptible to the other isolates. The highly resistant lines were advanced over several generations by self-pollination. Although these lines were fully homozygous, several lines lost resistance in later generations, indicating that the resistance was unstable. Selection for resistance in these unstable lines did not prevent the occurrence of susceptible progeny in subsequent generations. Therefore, testing over several generations is required to determine the stability of resistance when breeding crops with transgenic virus resistance.

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Authors and Affiliations

  1. Department of Crop Science, North Carolina State University, Raleigh, 27695, USA

    Yan Sheng Liu, Jennifer S. Levin, Jeffrey S. Murray, Earl A. Wernsman & Arthur K. Weissinger

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  1. Yan Sheng Liu
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  2. Jennifer S. Levin
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  3. Jeffrey S. Murray
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  4. Earl A. Wernsman
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  5. Arthur K. Weissinger
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Sheng Liu, Y., Levin, J.S., Murray, J.S. et al. A multi-generation analysis of the stability of transgenic virus resistance in doubled-haploid tobacco lines. Molecular Breeding 12, 145–156 (2003). https://doi.org/10.1023/A:1026011415460

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