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Resistance at the TM-2 locus in the tomato to tomato mosaic virus

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Summary

There are three known tomato mosaic virus (TMV) resistance factors, Tm-1, Tm-2 and Tm-2 2, in the tomato. Tm-2 2 is currently the most widely utilised in glasshouse cultivars. Both Tm-2 and Tm-22 can induce systemic necroses in response to virus infection. These are considered to be hypersensitive resistance reactions in view of the low virus concentrations in affected plants and because sub-inoculation usually fails to infect all plants possessing the same resistance gene. The literature relating to TMV resistance at the Tm-2 locus in the tomato is reviewed.

Virulent strains may readily establish when Tm-1 or Tm-2 are used, but Tm-2 2 confers more effective resistance. The possible development of aggressive isolates capable of affecting Tm-2 2/Tm-22 plants is discussed. The establishment of virus types which cause systemic necrosis at normal growing temperatures is considered more likely than widespread infection from fully virulent strain 22 mutants. However, the growing of crops isolated from the TMV reservoirs in the soil considerably reduces the likelihood of even this occurring.

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Hall, T.J. Resistance at the TM-2 locus in the tomato to tomato mosaic virus. Euphytica 29, 189–197 (1980). https://doi.org/10.1007/BF00037266

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