Analysis of nrDNA polymorphism in closely related diploid sexual, tetraploid sexual and polyploid agamospermous species.

Abstract

Nucleotide characteristics, substitution pattern, secondary structure, and the phylogenetic utilitry of ITS2-5.8S-ITS2 from 301 clones of 32 species representing 11 sections of the genus Taraxacum were examined. The within-individual polymorphism of clones implies that the concerted evolution of ITS cistron of agamospermous polyploid Taraxacum is remarkably suppressed.

Keywords

• Taraxacum
• agamospermy
• reticulation
• nrDNA polymorphism
• ITS1-5.8S-ITS2
• cloning
• polyploidy.