图2. 扁桃亚属4种野生植物28个单倍型(R1-R28)的地理分布及其单倍型网络。图中种群采样点编码与图1一致, 饼图表示各种群的单倍型频率。A, 单倍型网络, 图中圆圈大小与单倍型频率成正比, 节点间的分支长度大致与单倍型的突变数成正比, 相应分支附近附有步长; 稠李和山桃作为外类群。

Fig. 2. Geographical distribution and the haplotype network of 28 haplotypes (R1-R28) of four subgen. Amygdalus wild plants. The population field sampling point codes in the figure are consistent with the ones in Fig. 1. Pie graphs indicate the frequency of each haplotype of these populations. A, In the median-joining haplotypes network, the sizes of the circles in the network are proportional to the haplotype frequencies. Branch lengths are roughly proportional to the number of mutation steps between haplotypes and nodes; the true number of steps is shown near the corresponding branch sections. Padus racemosa and Amygdalus davidiana was used as outgroup.