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A 4x potato (+) tomato fusion hybrid (2n = 4x = 48) was successfully backcrossed with a diploid Lycopersicon pennellii (2n = 2x = 24). Genomic in situ hybridization (GISH) on somatic and meiotic chromosomes confirmed that the progenies were triploids (2n = 3x = 36) and possessed three different genomes: potato, tomato, and L. pennellii. Therefore, they have(More)
Uniparental activity of ribosomal RNA genes (rDNA) in interspecific hybrids is known as nucleolar dominance (ND). To see if difference in rDNA intergenic spacers (IGS) might be correlated with ND, we have used artificial Solanum allopolyploids and back-crossed lines. Combining fluorescence in situ hybridization and quantification of the level of the rRNA(More)
Phytophthora infestans is the causal agent of late blight in potato. The Mexican species Solanum demissum is well known as a good resistance source. Among the 11 R gene differentials, which were introgressed from S. demissum, especially R8 and R9 differentials showed broad spectrum resistance both under laboratory and under field conditions. In order to(More)
Identification of resistance (R) genes to Phytophthora infestans is an essential step in molecular breeding of potato. We identified three specific R genes segregating in a diploid mapping population. One of the R genes is located on chromosome 4 and proved phenotypically indistinguishable from the Solanum demissum-derived R2, although S. demissum is not(More)
To increase the potential for establishing a complete series of tomato chromosome addition-sbstitution lines in a potato background, six new BC1 progeny were produced. All of them originated from crosses between three different hexaploid potato (+) tomato fusion hybrids. Three different somatic hybrids, viz., C31-17-5, C31-17-24, and C31-17-51, were used as(More)
Introgression breeding has resulted in several potato lines that are resistant to late blight, a devastating plant disease caused by the oomycete Phytophthora infestans. The traditional differential set consists of potato lines with 11 late blight resistance specificities, referred to as R1 to R11. With the exception of the R4 locus, all the resistance loci(More)
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