The phylogeny of Ptychostomum was first spacer （ITS） region of the nuclear ribosomal （nr） DNA DNA rps4 sequences. Maximum parsimony, maximum undertaken based on analysis of the internal transcribed and by combinin...The phylogeny of Ptychostomum was first spacer （ITS） region of the nuclear ribosomal （nr） DNA DNA rps4 sequences. Maximum parsimony, maximum undertaken based on analysis of the internal transcribed and by combining data from nrDNA ITS and chloroplast likelihood, and Bayesian analyses all support the conclusion that the reinstated genus Ptychostomum is not monophyletic. Ptychostomum funkii （Schwagr.） J. R. Spence （≡ Bryum funkii Schwaigr.） is placed within a clade containing the type species of Bryum, B. argenteum Hedw. The remaining members of Ptychostomum investigated in the present study constitute another well-supported clade. The results are congruent with previous molecular analyses. On the basis of phylogenetic evidence, we agree with transferring B. amblyodon Mull. Hal. （≡ B. inclinatum （Brid.） Turton≡ Bryum archangelicum Bruch ＆ Schimp.）, Bryum lonchocaulon Mull. Hal., Bryum pallescens Schleich. ex Schwaigr., and Bryum pallens Sw. to Ptychostomum.展开更多
目的:基于DNA条形码技术建立肉苁蓉样品的高分辨率熔解曲线(HRM)鉴定方法。方法:通过聚合酶链式反应(PCR)对肉苁蓉的ITS和ITS2序列进行扩增;利用MEGA 6.06软件通过建树法进行NJ树聚类分析;通过ITS2序列利用Primer Premier 5软件进行引...目的:基于DNA条形码技术建立肉苁蓉样品的高分辨率熔解曲线(HRM)鉴定方法。方法:通过聚合酶链式反应(PCR)对肉苁蓉的ITS和ITS2序列进行扩增;利用MEGA 6.06软件通过建树法进行NJ树聚类分析;通过ITS2序列利用Primer Premier 5软件进行引物设计;对经设计、合成的8对引物通过HRM实验进行筛选;建立肉苁蓉的HRM鉴定方法。结果:通过ITS和ITS2序列的NJ树聚类分析可以有效区分3种肉苁蓉(肉苁蓉、管花肉苁蓉及采自乌兹别克斯坦的肉苁蓉相近种),且肉苁蓉和管花肉苁蓉各自的栽培品与野生品不存在明显差异;经过Primer Premier 5软件进行引物设计共选出8对引物进行合成;通过HRM预实验筛选出引物Ysr-2为最佳实验引物;确立了有效鉴定3种肉苁蓉样品的HRM方法。结论:通过DNA条形码和HRM技术均能有效鉴定3种肉苁蓉样品,且结果一致,起到互相验证的作用,为肉苁蓉及其他中药民族药品种的快速鉴定提供了可以参考的依据。展开更多
In order to develop better insights into biogeographic patterns of eastern Asian and North American disjunct plant genera, sequences of nuclear ribosomal DNA internal transcribed spacer (nr DNA ITS) region were used t...In order to develop better insights into biogeographic patterns of eastern Asian and North American disjunct plant genera, sequences of nuclear ribosomal DNA internal transcribed spacer (nr DNA ITS) region were used to estimate interspecific relationships of Thuja L. (Cupressaceae) and infer its biogeography based on the phylogeny. According to the phylogenetic analysis, two clades were recognized. The first clade included Thuja plicata D. Don (western North America) and T. koraiensis Nakai (northeastern Asia), and the second one contained T. occidentalis(Gord.) Carr. (Japan). The ancestral area of Thuja was inferred to be eastern Asia, and two dispersal events were responsible for the modern distribution of Thuja in North America. Both the North Atlantic land bridge and Bering land bridge were possible routes for the migration of ancestral populations to North America.展开更多
基金supported by the National Natural Science Foundation of China(grantno.30670152)the National Infrastructure of Natural Resources for Science and Technology(grant no.2005DKA21403)the Natural Science Foundation of Hebei Province,China(no.C2008000158)
文摘The phylogeny of Ptychostomum was first spacer （ITS） region of the nuclear ribosomal （nr） DNA DNA rps4 sequences. Maximum parsimony, maximum undertaken based on analysis of the internal transcribed and by combining data from nrDNA ITS and chloroplast likelihood, and Bayesian analyses all support the conclusion that the reinstated genus Ptychostomum is not monophyletic. Ptychostomum funkii （Schwagr.） J. R. Spence （≡ Bryum funkii Schwaigr.） is placed within a clade containing the type species of Bryum, B. argenteum Hedw. The remaining members of Ptychostomum investigated in the present study constitute another well-supported clade. The results are congruent with previous molecular analyses. On the basis of phylogenetic evidence, we agree with transferring B. amblyodon Mull. Hal. （≡ B. inclinatum （Brid.） Turton≡ Bryum archangelicum Bruch ＆ Schimp.）, Bryum lonchocaulon Mull. Hal., Bryum pallescens Schleich. ex Schwaigr., and Bryum pallens Sw. to Ptychostomum.
文摘目的:基于DNA条形码技术建立肉苁蓉样品的高分辨率熔解曲线(HRM)鉴定方法。方法:通过聚合酶链式反应(PCR)对肉苁蓉的ITS和ITS2序列进行扩增;利用MEGA 6.06软件通过建树法进行NJ树聚类分析;通过ITS2序列利用Primer Premier 5软件进行引物设计;对经设计、合成的8对引物通过HRM实验进行筛选;建立肉苁蓉的HRM鉴定方法。结果:通过ITS和ITS2序列的NJ树聚类分析可以有效区分3种肉苁蓉(肉苁蓉、管花肉苁蓉及采自乌兹别克斯坦的肉苁蓉相近种),且肉苁蓉和管花肉苁蓉各自的栽培品与野生品不存在明显差异;经过Primer Premier 5软件进行引物设计共选出8对引物进行合成;通过HRM预实验筛选出引物Ysr-2为最佳实验引物;确立了有效鉴定3种肉苁蓉样品的HRM方法。结论:通过DNA条形码和HRM技术均能有效鉴定3种肉苁蓉样品,且结果一致,起到互相验证的作用,为肉苁蓉及其他中药民族药品种的快速鉴定提供了可以参考的依据。
文摘In order to develop better insights into biogeographic patterns of eastern Asian and North American disjunct plant genera, sequences of nuclear ribosomal DNA internal transcribed spacer (nr DNA ITS) region were used to estimate interspecific relationships of Thuja L. (Cupressaceae) and infer its biogeography based on the phylogeny. According to the phylogenetic analysis, two clades were recognized. The first clade included Thuja plicata D. Don (western North America) and T. koraiensis Nakai (northeastern Asia), and the second one contained T. occidentalis(Gord.) Carr. (Japan). The ancestral area of Thuja was inferred to be eastern Asia, and two dispersal events were responsible for the modern distribution of Thuja in North America. Both the North Atlantic land bridge and Bering land bridge were possible routes for the migration of ancestral populations to North America.
