[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） f...[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） from 29 taxa of Caragana species and seven close relatives （all belong to Astralinae （Adens） Benth） were used for phylogenetic analysis. [Result] Length of the entire ITS region ranges from 611 to 614 bp in Caragana species. The aligned sequences nrlTS of Caragana are 655 bp, and 170 sites are variable, with 107 phylogenetically informative sites. The phylogenetically informative sites are 16.3% of the total aligned sequences. The ITS sequences data are useful to resolve some relationships at lower taxonomic levels within Caragana. The Caragana Fabr. is not a monophyletic group with very close connection with Calophaca tianschanica. The ITS data revealed that the species of Sect. tragacanthoides were dispersed in MP tree or ME tree. Although the morphol- ogy of C. ordosica is similar to C. tibetica, the ITS results revealed an unexpectedly close relativeship to C. roborovskyi. The ITS data also indicate C. davazamcii, C. korshinskii, C. intermedia, and C. microphylla are different species. [Conclusion] ITS sequences have an important reference value in exploring the relationships of Cara- gana.展开更多
Korshinsk Peashrub, a kind of excellent shrub resources in our country, is widely distributed in＂Three North＂ areas, namely, northeast, northwest and north China. The adaptability and survival rate of Korshinsk Peas...Korshinsk Peashrub, a kind of excellent shrub resources in our country, is widely distributed in＂Three North＂ areas, namely, northeast, northwest and north China. The adaptability and survival rate of Korshinsk Peashrub are quite high and it has a strong resistance to coldness, drought and barren lands. The ability of branching and regeneration is considerably high, and its branches need to be chopped every four to five years, so the period of chopping for Korshinsk Peashrub is short, and the yield is high. Therefore, the advantages of Korshinsk Peashrub, such as abundant resources, easy to obtain, and high yield, should be made full use of, and the branches during chopping period should be fully utilized. Research on Korshinsk Peashrub resources can not only promote new development of the theory that applies to the specific biomass of Korshinsk Peashrub, but also help re- alizing environment friendly and convenient to use. It has great practical significance. The paper mainly introduces the advantages and research status of Korshinsk Peashrub resources in China. On this topic, new use of Korshinsk Peashrub should be explored, so as to make full use of Korshinsk Peashrub resources, and improve their application value further more.展开更多
Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the ...Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the paralogy node and determine the informative subtree. The area relationships are generally illustrated in several subtrees and the consensus tree. The distribution pattern of the genus Caragana comprising about 72 species and occurring in 13 areas, was analyzed by using subtree method and TASS procedure in this study. The results showed seven subtrees representing the area relationships of section and series of the genus, and the consensus tree provided the 13 area relationships. These results are congruent with our former result using component analysis for Caragana.展开更多
基金Supported by National Key Basic Research Development Program of China(2002CB111505)~~
文摘[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） from 29 taxa of Caragana species and seven close relatives （all belong to Astralinae （Adens） Benth） were used for phylogenetic analysis. [Result] Length of the entire ITS region ranges from 611 to 614 bp in Caragana species. The aligned sequences nrlTS of Caragana are 655 bp, and 170 sites are variable, with 107 phylogenetically informative sites. The phylogenetically informative sites are 16.3% of the total aligned sequences. The ITS sequences data are useful to resolve some relationships at lower taxonomic levels within Caragana. The Caragana Fabr. is not a monophyletic group with very close connection with Calophaca tianschanica. The ITS data revealed that the species of Sect. tragacanthoides were dispersed in MP tree or ME tree. Although the morphol- ogy of C. ordosica is similar to C. tibetica, the ITS results revealed an unexpectedly close relativeship to C. roborovskyi. The ITS data also indicate C. davazamcii, C. korshinskii, C. intermedia, and C. microphylla are different species. [Conclusion] ITS sequences have an important reference value in exploring the relationships of Cara- gana.
基金Foundation Key Scientific and Technological Project in Shanxi Province(20090311043)~~
文摘Korshinsk Peashrub, a kind of excellent shrub resources in our country, is widely distributed in＂Three North＂ areas, namely, northeast, northwest and north China. The adaptability and survival rate of Korshinsk Peashrub are quite high and it has a strong resistance to coldness, drought and barren lands. The ability of branching and regeneration is considerably high, and its branches need to be chopped every four to five years, so the period of chopping for Korshinsk Peashrub is short, and the yield is high. Therefore, the advantages of Korshinsk Peashrub, such as abundant resources, easy to obtain, and high yield, should be made full use of, and the branches during chopping period should be fully utilized. Research on Korshinsk Peashrub resources can not only promote new development of the theory that applies to the specific biomass of Korshinsk Peashrub, but also help re- alizing environment friendly and convenient to use. It has great practical significance. The paper mainly introduces the advantages and research status of Korshinsk Peashrub resources in China. On this topic, new use of Korshinsk Peashrub should be explored, so as to make full use of Korshinsk Peashrub resources, and improve their application value further more.
文摘Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the paralogy node and determine the informative subtree. The area relationships are generally illustrated in several subtrees and the consensus tree. The distribution pattern of the genus Caragana comprising about 72 species and occurring in 13 areas, was analyzed by using subtree method and TASS procedure in this study. The results showed seven subtrees representing the area relationships of section and series of the genus, and the consensus tree provided the 13 area relationships. These results are congruent with our former result using component analysis for Caragana.
