Abstract
Species-specific repetitive DNA probes are a useful tool for the molecular identification of somatic hybrids. Therefore, the distribution of three repetitive DNA elements of Solanum was investigated in Solanum wild species, Solanum breeding lines, and in more distantly related species of the genera Lycopersicon, Nicotiana, and Datura. The clone pSCH15, obtained from S. circaeifolium, represents a new 168-bp repetitive element; it shows 73–79% sequence similarity to repetitive elements of S. brevidens and Lycopersicon species. The 163-bp element in pSBH6, cloned from S. bulbocastanum, turned out to be very similar (95% sequence homology) to the Lycopersicon element pLEG15/TGRI previously regarded to be present only in species of the genus Lycopersicon and in S. lycopersicoides. Lower sequence similarity of approximately 80% was observed to repetitive elements of S. brevidens which are organized differently. The repeats exhibited different degrees of specificity: by Southern hybridization the element represented by the clone pSBH6 could be detected in almost all Solanum species investigated here but only after long exposure to X-ray film. The previously described “Solanum-specific” element represented by the clone pSA287 was also found, although in a very low copy number, in Lycopersicon esculentum. Therefore, detection of the repetitive elements pSA287 and pSBH6 in those species in which the respective repeat is less represented depends on exposure time. In contrast, the element pSCH15 is prominently present only in a small number of Solanum wild species and — to some extent — in the diploid breeding lines as revealed after long exposure. Use of these repeated elements for the identification of specific genomes in protoplast-fusion hybrids between Solanum wild species and Solanum breeding lines, or between two breeding lines, was evaluated.
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Stadler, M., Stelzer, T., Borisjuk, N. et al. Distribution of novel and known repeated elements of Solanum and application for the identification of somatic hybrids among Solanum species. Theoret. Appl. Genetics 91, 1271–1278 (1995). https://doi.org/10.1007/BF00220940
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DOI: https://doi.org/10.1007/BF00220940