Development of chloroplast microsatellite markers for Glyptostrobus pensilis (Cupressaceae)

Abstract

Premise: Glyptostrobus pensilis (Cupressaceae) is a critically endangered conifer native to China, Laos, and Vietnam, with only a few populations remaining in the wild. Methods and Results: Using a complete chloroplast genome sequence, we designed 70 cpSSR loci and tested them for amplification success and polymorphism in 16 samples. Ten loci were found to be polymorphic and their genetic diversity was characterized using a total of 83 individuals from three populations in China. A total of 43 haplotypes were present, the effective number of haplotypes varied from 4.55 to 13.36, and the haplotypic richness ranged from 8.04 to 16.00. Gene diversity ranged from 0.81 to 0.97 (average 0.89). The number of alleles per locus and population ranged from one to eight, and the effective number of alleles ranged from 1.00 to 3.90. All polymorphic loci were successfully amplified in the related species Cryptomeria japonica var. sinensis, Taxodium distichum, T. ascendens, and Cunninghamia lanceolata. Conclusions: These newly developed chloroplast microsatellites will be useful for population genetic and phylogeographic analyses of G. pensilis and related species.