| Abstrakt: |
The accumulation of sesquiterpenoid stress metabolites in potato stems, roots and stolons after inoculation with Erwinia carotovorassp. atrosepticawas examined. In stem tissue showing early symptoms of blackleg, high concentrations of sesquiterpenoid phytoalexins, up to 560 μg of solavetivone and 470 μg of rishitin per gram fresh weight, had accumulated. Phytuberin, phytuberol, hydroxysolavetivone, a stereoisomer of rishitin and solanascone were detected in smaller amounts, but no lubimin, a main phytoalexin of Phytophthora-infected potato tubers, was found. In stem tissue, solavetivone concentrations were often much higher than rishitin concentrations, and always several fold higher than phytuberin concentrations. The progress of blackleg within cultivars was not homogenous and a correlation between the content of phytoalexins in diseased stem tissue and cultivar resistance to blackleg is uncertain. |
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