Cypripedium tibeticum is a threatened orchid which efficient conservation requires knowledge of its extent and structure of genetic variation. Using two chloroplast DNA fragments(rps16 and trnL-F), we analyzed 157 ind...Cypripedium tibeticum is a threatened orchid which efficient conservation requires knowledge of its extent and structure of genetic variation. Using two chloroplast DNA fragments(rps16 and trnL-F), we analyzed 157 individuals from 9 populations representing the species range in China. Seven haplotypes were identified. C. tibeticum had high total genetic diversity(H_T=0.80) with major contribution to this diversity made by among-population component(G_ST=0.64, Ф_ST= 0.86). However, despite high population differentiation there was no clear phylogeographic structure. The populations CY and DC made the greatest contribution to the total gene diversity as well as allelic richness. The possible mechanisms and implications of these findings for conservation of the species are discussed.展开更多
A new phenanthraquinone, cypripediquinone A, was isolated from the rhizome of Cypripedium macranthum ( Orchidaceae ) and its structure was established as 2,4,7-trimethoxy-9, 10- phenanthraquinone mainly by spectroscop...A new phenanthraquinone, cypripediquinone A, was isolated from the rhizome of Cypripedium macranthum ( Orchidaceae ) and its structure was established as 2,4,7-trimethoxy-9, 10- phenanthraquinone mainly by spectroscopic analysis.展开更多
基金supported by the National Natural Science Foundation of China (grant nos. 31460050 and 31760048 to Yong-Hong Zhang)
文摘Cypripedium tibeticum is a threatened orchid which efficient conservation requires knowledge of its extent and structure of genetic variation. Using two chloroplast DNA fragments(rps16 and trnL-F), we analyzed 157 individuals from 9 populations representing the species range in China. Seven haplotypes were identified. C. tibeticum had high total genetic diversity(H_T=0.80) with major contribution to this diversity made by among-population component(G_ST=0.64, Ф_ST= 0.86). However, despite high population differentiation there was no clear phylogeographic structure. The populations CY and DC made the greatest contribution to the total gene diversity as well as allelic richness. The possible mechanisms and implications of these findings for conservation of the species are discussed.
文摘A new phenanthraquinone, cypripediquinone A, was isolated from the rhizome of Cypripedium macranthum ( Orchidaceae ) and its structure was established as 2,4,7-trimethoxy-9, 10- phenanthraquinone mainly by spectroscopic analysis.
