Abstract
Bacterial soft rot caused by Pectobacterium and Dickeya species can cause major losses to the potato (Solanum tuberosum L.) industry, mostly due to tuber rot in storage. There are few germplasm resources for soft rot resistance breeding. Here, we introduce a resistant diploid wild potato relative, M6, identified with a new disease scoring method. M6 shows a barrier-like resistance mechanism which appears to be a rapid form of wound healing. We found that scoring for this lesion type is correlated with soft rot resistance. This new resource for resistance and the new scoring method can enhance efforts to breed for resistance to bacterial soft rot and improve evaluation efforts.
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