Fig. 2.

(a) Frequency distribution of the two genetic clusters as revealed in STRUCTURE analysis with K = 2 in the 16 Arnebia szechenyi populations.The eastern genetic group (EAST) which consists of eleven populations located southeast of the Tengger Desert and along the Helan Moutains; the western genetic group (WEST), which is composed of five populations (SD, ZY, JC, YBL and NRG) located between the Badain Jaran Desert and the Tengger Desert; (b) Principle component analysis based on pairwise genetic differentiation (Fst) of populations. (c) Histogram of the STRUCTURE assignments for all individuals at K = 2 and K = 3.