3.3.2Analysis of population genetic structure
When K=2, the samples from group 1 appear almost dark blue, and the
samples from group 2 appear almost light purple. Upon dividing the
samples into two subgroups, the samples from JFL and BWL were clustered
into group 1, and the remaining samples were clustered into group 2
(Figure 3). In the cross-validation (CV) error plot (Figure 4), CV error
reached its minimum value when K=1, indicating that the genetic
differences among C. hainanense samples were relatively small,
and their genetic relationships were close. Thus, it can be
preliminarily inferred that the six C. hainanense populations in
Hainan Island originated from the same ancestor and had undergone more
gene exchanges. In the table of genetic differentiation coefficients
among populations (Table 4), the Fst values among the
six C. hainanense populations were between -0.09648 to 0.076729.
There was a moderate degree of genetic differentiation (0.05 <
Fst < 0.15) between the two populations of BSL
and JFL. Furthermore, the genetic differentiation among other
populations was low, indicating that differentiation was not significant
(Fst < 0.05).