Within the genus Centaurea L., polyploidy is very common, and it believed that, as to all angiosperms, was key in history of its diversification evolution. tentudaica a hexaploid from subsect. Chamaecyanus unknown origin. In this study, we examined possible autopolyploid or allopolyploid origin using allozymes sequences three molecular markers: nuclear-ribosomic region ETS, low-copy genes AGT1 ...

We explore the potential of mitochondrial DNA (mtDNA) analysis, alone and in conjunction with allozymes, to study low-frequency hybridization and introgression phenomena in natural populations. MtDNAs from small samples of nine species of sunfish (Lepomis, Centrarchidae) were purified and digested with each of 13 informative restriction enzymes. Digestion profiles for all species were highly di...