Fig. 4From: Analysis of the genetic diversity and structure across a wide range of germplasm reveals prominent gene flow in apple at the European levelGenetic composition of the groups of cultivars clustered by country of origin for K = 3 groups inferred with Structure. For the detailed country list, see Additional file 1. The pies represent the proportion of each group in each country; color codes are as per Fig. 1 a1Back to article page