Chromosome analys?s and mapp?ng of ribosomal genes by fluorescence ?n s?tu hybr?d?zat?on (FISH) ?n four endem?c lily spec?es (L?l?um) ?n Qinling mountians, China

摘要

Detailed karyotypes of 4 lily species (Lilium regale, L. duchartrei, L. brownii var viridium and L. leucanthum var. centifolium), native to Qinling Moutains in China, were constructed on the basis of chromosome arm lengths and fluorescence in situ hybridisation (FISH) with the 45S and 5S rDNA sequences as probes. Results showed that the relative length of these 4 genomes were all around 300μm, and the karyotypes were similar, which consisted of 2 pairs of (sub) metacentric and 10 pairs of (sub)telocentric chromosomes. FISH results showed that 4 pairs of homologous chromosomes with 6 45s rDNA and 2 5s rDNA signals in L. regale, 7 pairs of homologous chromosomes with 12 45s rDNA and 4 5s rDNA loci in L. duchartrei, 5 pairs of homologous chromosomes and one of the chromosome number 2 with 7 45s rDNA loci and 4 5s rDNA loci in L. brownii var viridium, and 3 pairs of homologous chromosomes with 4 45s rDNＡloci and 2 5s rDNA loci in L. leucanthum var. centifolium could be distinguished. The odd number of 45s rDNA signals in L. leucanthum var. centifolium reflected its heterozygosity.