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Complementation of CMV Subgroup IA Strains in Replicase-mediated Resistant Tobacco Plants after Co-inoculation with Different Cucumoviruses

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Abstract

Replicase-mediated tobacco plants are highly resistant to the Fny strain of Cucumber mosaic virus (CMV) and closely related subgroup IA strains. Two of these subgroup IA strains, Fny- and M-CMV, were co-inoculated with different resistance breaking cucumoviruses to nontransformed and transformed tobacco plants. RT-PCR analyses of single CMV RNAs were performed to study potential complementation of the subgroup IA strains by the resistance breaking cucumoviruses. After co-inoculation of M-CMV with PII-CMV, RNAs 1, 2 and 3 from M-CMV were detected in systemically infected leaves of control plants, whereas in noninoculated parts of replicase-mediated resistant plants only M-CMV RNAs 1 and 3 were found. Western blot studies confirmed the expression of M-CMV coat protein after co-inoculation with PII-CMV in leaves of transgenic plants. These plants also exhibited M-CMV typical yellow spots. M-CMV/TAV co-inoculated transgenic plants contained only M-CMV RNA 3, but no M-CMV RNAs 1 and 2. No M-CMV typical yellow spots were observed in these plants. Our data suggest different types of complementation of M-CMV in replicase-mediated resistant plants by PII-CMV and TAV in trans potentially leading to new RNA combinations in transformed plants compared to nontransformed plants.

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Hellwald, KH., Glenewinkel, D., Hauber, S. et al. Complementation of CMV Subgroup IA Strains in Replicase-mediated Resistant Tobacco Plants after Co-inoculation with Different Cucumoviruses. European Journal of Plant Pathology 107, 713–721 (2001). https://doi.org/10.1023/A:1011927517182

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