Study on the Genetic Structure Based on Geographic Populations of the Endangered Tree Species: Liriodendron chinense

Liriodendron chinense (Hemsley) Sargent is a Class II protected plant in China as natural populations are on the verge of extinction. There still lack systematic research genetic resources its geographic populations. In this study, we used 20 pairs SSR markers with high polymorphism to analyze total 808 L. samples from 22 regions, and 63 tulipifera Linn 2 regions were comparison group. The results revealed 78 alleles chinense, average expected heterozygosity (He) was 0.558, showing low level diversity. degree differentiation high, coefficient (Fst) 0.302, which related gene flow (Nm = 0.578). Based structure, principal coordinate analysis (PCoA) phylogenetic 24 spp. populations, had obvious differentiation, while between very large irregular. Inbreeding appears within diversity low. order protect addition protecting existing population much possible, artificial cultivation should introduce materials multiple