Summary
Bacterial ring rot of potato (Solanum tuberosum) has not been successfully controlled through management of certified seed. Therefore, the identification of immunity to this pathogen and its introgression into the cultivated potato is vitally important to the potato industry. Immunity was detected in the disomic tetraploid 2EBN (Endosperm Balance Number) species S. acaule. Immune and nonimmune parents were crossed in a 4 × 4 mating scheme that consisted of four immune × immune crosses, four immune × nonimmune, four nonimmune × immune, and four nonimmune × nonimmune crosses. Analysis was performed on the 16 F1 populations and 54% of the progeny was found to exhibit an immune response to inoculation with Clavibacter michiganensis subsp. sepedonicus (Spieck & Kotth.) Davis et al. Immunity appears to be conferred by two dominant alleles, one at each locus, and may be associated with minor or modifying genes. Phenotypic expression of nonimmune progeny ranged from susceptible to resistant, probably due to minor or modifying genes. These results indicate that it may not be difficult to transfer immunity into the cultivated potato.
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Kriel, C.J., Jansky, S.H., Gudmestad, N.C. et al. Immunity to Clavibacter michiganensis subsp. sepedonicus: Inheritance of immunity in Solanum acaule . Euphytica 82, 133–139 (1995). https://doi.org/10.1007/BF00027059
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DOI: https://doi.org/10.1007/BF00027059