: 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...: 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
杉科、柏科是松柏类裸子植物中的重要类群,其系统分类研究一直是裸子植物的研究热点之一.但是杉科与柏科之间及其内部各属之间的系统发生关系却一直存在争议.一般认为杉科、柏科单独成科.近年来的分子系统学及分支系统学研究结果证实:...杉科、柏科是松柏类裸子植物中的重要类群,其系统分类研究一直是裸子植物的研究热点之一.但是杉科与柏科之间及其内部各属之间的系统发生关系却一直存在争议.一般认为杉科、柏科单独成科.近年来的分子系统学及分支系统学研究结果证实:除了金松属以外,杉科和柏科为一单系群,应合并为一个科Cupres-saceae sensu lato（广义柏科）,其主要分支类群的系统发生关系也已经基本确立,而金松属则单独成立金松科.展开更多
Epicuticular waxes have vital roles in the growth and development of plants and in defense. Conifers have a considerable amount of waxes on their cones and leaves.Here we characterized the n-alkane composition of Iran...Epicuticular waxes have vital roles in the growth and development of plants and in defense. Conifers have a considerable amount of waxes on their cones and leaves.Here we characterized the n-alkane composition of Iranian conifers, including Juniperus oblonga, J. foetidissima, J.sabina, J. communis subsp. hemisphaerica, J. excelsa,Cupressus sempervirens, Platycladus orientalis from Cupressaceae and Taxus baccata from Taxaceae for the first time using GC-FID analyses. In the waxes, 25 n-alkane homologs with chain lengths ranging from C7 to C32 were identified. Short-chain n-alkanes were dominant in almost all samples with some exceptions. Complementary studies to elucidate complete wax constituents of Iranian conifers and n-alkane distribution pattern as a function of geographical and bioclimatic variables are recommended.展开更多
This paper examed the Cupressaceae taxa in China. It is identifled that 30 species and 16 varieties in 7 genera in thefamily are indigenous, and estimated that about 25 species and 4 varieties have been introduced int...This paper examed the Cupressaceae taxa in China. It is identifled that 30 species and 16 varieties in 7 genera in thefamily are indigenous, and estimated that about 25 species and 4 varieties have been introduced into this country since the beginning of this century. It is urgent that more furthur studies need to be carried out in the country on the taxonomy especially of junipers and cypresses, on the re-classification ofexisting cultivars, and on the development of new cultivars for future needs.展开更多
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.
文摘杉科、柏科是松柏类裸子植物中的重要类群,其系统分类研究一直是裸子植物的研究热点之一.但是杉科与柏科之间及其内部各属之间的系统发生关系却一直存在争议.一般认为杉科、柏科单独成科.近年来的分子系统学及分支系统学研究结果证实:除了金松属以外,杉科和柏科为一单系群,应合并为一个科Cupres-saceae sensu lato（广义柏科）,其主要分支类群的系统发生关系也已经基本确立,而金松属则单独成立金松科.
基金fully funded by the Mashhad University of Medical Sciences Research Council
文摘Epicuticular waxes have vital roles in the growth and development of plants and in defense. Conifers have a considerable amount of waxes on their cones and leaves.Here we characterized the n-alkane composition of Iranian conifers, including Juniperus oblonga, J. foetidissima, J.sabina, J. communis subsp. hemisphaerica, J. excelsa,Cupressus sempervirens, Platycladus orientalis from Cupressaceae and Taxus baccata from Taxaceae for the first time using GC-FID analyses. In the waxes, 25 n-alkane homologs with chain lengths ranging from C7 to C32 were identified. Short-chain n-alkanes were dominant in almost all samples with some exceptions. Complementary studies to elucidate complete wax constituents of Iranian conifers and n-alkane distribution pattern as a function of geographical and bioclimatic variables are recommended.
文摘This paper examed the Cupressaceae taxa in China. It is identifled that 30 species and 16 varieties in 7 genera in thefamily are indigenous, and estimated that about 25 species and 4 varieties have been introduced into this country since the beginning of this century. It is urgent that more furthur studies need to be carried out in the country on the taxonomy especially of junipers and cypresses, on the re-classification ofexisting cultivars, and on the development of new cultivars for future needs.
