Origins and widespread distribution of co-existing Polyploids in Arnica cordifolia (Asteraceae).

ABSTRACT:

Background and aims

Polyploidy is a central force structuring genetic diversity in angiosperms, but its ecological significance and modes of origin are not fully understood. This work investigated the patterns of coexistence and molecular relatedness of polyploids in the perennial herb, Arnica cordifolia.

Methods

The local- and broad-scale distributions of cytotypes were analysed using flow cytometry. Samples were collected from both roadside and understorey habitats to test the hypothesis of niche separation between triploids and tetraploids. The nuclear rDNA internal transcribed spacer (ITS) and plastid rpl16 spacer, trnL intron plus trnL-trnF spacer and trnK 3' intron regions were sequenced.

Key results

Broad-scale sampling established that both triploids and tetra

SUBMITTER: Kao RH 

PROVIDER: S-EPMC2701836 | biostudies-literature | 2008 Jan

REPOSITORIES: biostudies-literature