Role of adaptive and non-adaptive mechanisms forming complex patterns of genome size variation in six cytotypes of polyploid Allium oleraceum (Amaryllidaceae) on a continental scale.

ABSTRACT:

Background and aims

Although the large variation in genome size among different species is widely acknowledged, the occurrence and extent of variation below the species level are still controversial and have not yet been satisfactorily analysed. The aim of this study was to assess genome size variation in six ploidy levels (2n = 3x-8x) of the polyploid Allium oleraceum over a large geographical gradient and to search for potential interpretations of the size variation.

Methods

The genome sizes of 407 individuals of A. oleraceum collected from 114 populations across Europe were determined by flow cytometry using propidium iodide staining. The genome size variation was correlated with spatial, climatic and habitat variables.

Key results

The mean holoploid genome size (2

SUBMITTER: Duchoslav M 

PROVIDER: S-EPMC3579448 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature