Summary
Solanum nigrum and S. villosum, and their sexual hybrids with S. tuberosum and S. demissum respectively, were inoculated with a complex race of Phytophthora infestans. No visible reaction was seen on S. villosum and one genotype of S. nigrum. Another genotype of S. nigrum and the hybrids showed a hypersensitive response on most inoculated leaves. In one experiment, some sporulation was observed on detached leaves of a hybrid derived from S. nigrum. Microscopical examination of infections in S. nigrum and in a hybrid from S. nigrum, showed that penetration of epidermal cells and subsequent intercellular growth of the pathogen into the spongy mesophyll occurred, but without the formation of haustoria, and that invaded and neighbouring cells became necrotic. Callose appositions were found in epidermis and mesophyll cells of all inoculated genotypes, and also in epidermal cells of the unrelated nonhost species Brassica campestris.
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Colon, I.T., Eijlander, R., Budding, D.J. et al. Resistance to potato late blight (Phytophthora infestans (Mont.) de Bary) in Solanum nigrum, S. villosum and their sexual hybrids with S. tuberosum and S. demissum . Euphytica 66, 55–64 (1992). https://doi.org/10.1007/BF00023508
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DOI: https://doi.org/10.1007/BF00023508