Abstract
Accessions from exotic Solanum species, including diploid and tetraploid species, were screened for immunity to Clavibacter michiganensis subsp. sepedonicus, the causal agent of potato ring rot. The diploid species included S. infundibuliforme, S. lesteri, S. megistacrolobum, S. tuberosum Group Phureja, S. polyadenium, S. pinnatisectum, S. raphanifolium, S. sparsipilum, S. sanctae-rosae, S. tuberosum Group Stenotomum, S. toralapanum, and S. verrucosum. The tetraploid species included S. tuberosum Group Andigena, S. acaule, S. fendleri, S. hjertingii, S. oplocense, S. polytrichon, and S. stoloniferum. Apparent immunity was initially found in several diploid species, but was not present during subsequent retesting. Immunity was found in nine accessions of tetraploid S. acaule. These accessions maintained their immunity during testing over an eight-month period. S. acaule appears to be a good source of immunity for introgression studies.
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