Euchromatic Supernumerary Chromosomal Segments-Remnants of Ongoing Karyotype Restructuring in the <i>Prospero autumnale</i> Complex?

ABSTRACT: Supernumerary chromosomal segments (SCSs) represent additional chromosomal material that, unlike B chromosomes, is attached to the standard chromosome complement. The Prospero autumnale complex (Hyacinthaceae) is polymorphic for euchromatic large terminal SCSs located on the short arm of chromosome 1 in diploid cytotypes AA and B⁷B⁷, and tetraploid AAB⁷B⁷ and B⁶B⁶B⁷B⁷, in addition to on the short arm of chromosome 4 in polyploid B⁷B⁷B⁷B⁷ and B⁷B⁷B⁷B⁷B⁷B⁷ cytotypes. The genomic composition and evolutionary relationships among these SCSs have been assessed using fluorescence in situ hybridisation (FISH) with 5S and 35S ribosomal DNAs (rDNAs), satellite DNA PaB6, and a vertebrate-type telomeric repeat TTAGGG. Neither of the rDNA repeats were detected in SCSs, but most contained

SUBMITTER: Jang TS 

PROVIDER: S-EPMC6210179 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature