Fig. 4From: Genetic diversity and population structure of black cottonwood (Populus deltoides) revealed using simple sequence repeat markersAnalysis of the population structure of 384 P. deltoides Individuals. (a) Principal coordinates analysis (PCoA) of 384 individuals from six provenances. : the provenance population in Missouri, USA (‘Mis’); : the provenance population in Iowa, USA (‘Iow’); : the provenance population in Washington State, USA (‘Was’); : the provenance population in Quebec, Canada (‘Que’); : the provenance population in Louisiana, USA (‘Lou’); : the provenance population in Tennessee, USA (‘Ten’). Red circle area: Group I; Blue circle area: Group II. (b) Relations between the number of K and ΔK, based on the model developed by Evanno et al. [33]. (c) The population structure of P. deltoides determined using STRUCTURE 2.3.4 [34] software (K = 2). Red area: Group I; Blue area: Group II. ‘Mis’, ‘Iow’, ‘Was’, ‘Que’, ‘Lou’, ‘Ten’: different provenance populations respectivelyBack to article page