UPGMA dendrogram constructed based on the genetic similarity of 21 weedy rice populations.

<p>Similarity was estimated by 23 SSR loci, using cultivated (CV) and wild rice (Wild) as two reference groups.</p

The 23 SSR primer pairs used in this study with detail information on their DNA sequences, motifs, molecular weight, and expected heterozygosity in the examined weedy rice materials.

<p><i>Ch</i>: Chromosome; <i>H_e</i>: Nei's unbiased expected heterozygosity <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112778#pone.0112778-Excoffier1" target="_blank">[23]</a>.</p><p>The 23 SSR primer pairs used in this study with detail information on their DNA sequences, motifs, molecular weight, and expected heterozygosity in the examined weedy rice materials.</p

Number of pair-wise migrants per generation (<i>Nm</i>) between 21 weedy rice populations and cultivated rice group (CV) calculated based on the formula proposed by Slatkin and Barton [28].

<p>Number of pair-wise migrants per generation (<i>Nm</i>) between 21 weedy rice populations and cultivated rice group (CV) calculated based on the formula proposed by Slatkin and Barton <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112778#pone.0112778-Slatkin1" target="_blank">[28]</a>.</p

Correlation between genetic diversity and the average number of immigrants of a particular weedy rice population.

<p>Nei's (1987) unbiased expected heterozygosity (<i>H_e</i>) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112778#pone.0112778-Nei1" target="_blank">[22]</a> was used to estimate the correlation.</p

Geographical locations of the 21 weedy rice populations collected from Sri Lanka.

<p>The population codes at each collection site are shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112778#pone-0112778-t001" target="_blank">Table 1</a>. Division of the Dry and Wet zones <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112778#pone.0112778-Ratnasekera1" target="_blank">[9]</a> is represented by the dotted line. The colors in pies are corresponded to those in the STRUCTURE analysis for weedy rice populations.</p

The twenty-one weedy rice populations collected from different geographical locations in Sri Lanka with their GPS readings.

<p>The twenty-one weedy rice populations collected from different geographical locations in Sri Lanka with their GPS readings.</p

Genetic relationships of 21 weedy rice populations (Am-1 to Pu-2) and rice varieties (CV) from STRUCTURE analysis.

<p>Each individual is represented by a vertical bar assigned into three colors, with height proportional to each of the three inferred genetic components. The numbers beside vertical axis represent probability of assignment.</p

Analysis of molecular variance (AMOVA) of 21 weedy rice populations based on 23 SSR primer pairs.

<p>Df: degree of freedom; SS: sum of squared deviations; Var. comp.: variance component estimates; %: percentage of total variation.</p><p>Analysis of molecular variance (AMOVA) of 21 weedy rice populations based on 23 SSR primer pairs.</p