Fig. 1

rDNAs locations on AC142 and 508.3 a: the distribution of rDNAs on AC142; b: the distribution of rDNAs location on 508.3. Red signals denote 5S rDNA signals, green signalsdenote 25S rDNA signals. Bar: 10 μm."

Fig. 2

Recognition of the chromosome constitution though rDNA probes and GISH in somatic hybrid derived from potato and eggplant a: recognition of chromosomes containing rDNA sites in somatic hybrid 60-13 (red signals denote 5S sites, green signals denote 25S sites); b: recognition of parental chromosome origins by GISH performed after washing (Red signals denote chromosomes of S. tuberosum. Green signals denote chromosomes of S. melongena.). Arrowheads denote 25S sites, arrows denote 5S sites. Bar: 10 μm."

Fig. 3

Recognition of the chromosome constitution though rDNA probes, telomeric probe, and GISH in somatic hybrid derived from potato and eggplant a: the recognition of chromosomes containing rDNA sites in somatic hybrid PE60-10, red blocks denote 5S rDNA sites, green blocks denote 25S rDNA sites; b: the recognition of parental chromosome origins in (a) by GISH performed after washing, red denoted chromosomes from potato, green denoted chromosomes from eggplant.; c: the distribution of telomeric probe signals in PE60-10, red denoted the telomeric sites; d: the results of GISH performed after washing telomeric probe signals, red denoted chromosomes from potato, green denoted the chromosomes from eggplant. Arrowheads denoted 25S rDNA sites; arrows denoted 5S rDNA sites. White ellipse and rounded frames denote rearrangement chromo-somes containing 25S rDNA sites. The enlarged chromosomes in Fig. a, b, c, d denote chromosomes with white frames. Bar: 10 μm."

Fig. 4

Schematic diagram showing the formation of an end-to- end fused chromosome in somatic hybrid PE60-10 The apparent lightly stained areas on chromosomes denote nucleo-lar organizing regions (NOR). Chromosomes in the picture are from parents for somatic fusion between potato and eggplant, and their somatic hybrid PE60-10."

Fig. 5

Dicentric chromosome derived from chromosomal recombination in somatic hybrid PE60-10 a and b are two chromosome spreads of somatic hybrid 60-10. Arrows denote chromosomes with two centromeres. The white frames indicate chromosomes in black and white for better observation of constrictions. White lines denote primary constrictions, yellow lines denote another apparent constriction on chromosomes, respectively. Bar: 10 μm."