Abstract：
UNLABELLED: PREMISE OF THE STUDY:Sphagnum dominates vast expanses of wetland habitats throughout the northern hemisphere and species delimitation within the genus is important because floristic changes associated with a warming global climate may have measureable impacts on large-scale ecological processes. Most northern hemisphere peatmoss species (Sphagnum) have circumboreal ranges, but the Japanese species generally known as S. calymmatophyllum is endemic to Honshu Island. This prompted a population genetic and phylogenetic analysis to resolve the origin(s), population structure, and phylogenetic relationships of this morphologically variable species. • METHODS:Sixty plants collected from Mt. Gassan and Mt. Hakkoda were genotyped for 12 microsatellite loci. Two plastid loci and three anonymous nuclear loci were sequenced in a subset of the plants, plus representatives from 10 closely related species. • KEY RESULTS:Gametophytes exhibited fixed or nearly fixed heterozygosity at 9-10 of the 12 microsatellite loci. Two genetic groups were resolved by the microsatellite data, individuals showed no evidence of admixture, and the two groups of plants differ in morphology. They are heterozygous for different sets of alleles. The two taxa share plastid DNA sequences with two species that are common in Alaska. • CONCLUSIONS:Two taxa were distinguished: S. guwassanense and S. triseriporum. Both are allopolyploids; they originated independently from different but closely related progenitors. The maternal progenitor was likely either S. orientale or S. inexspectatum. The two allopolyploid taxa are heterozygous for (different) private microsatellite alleles, and one progenitor could be extinct.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Shaw AJ,Shaw B,Johnson MG,Higuchi M,Arikawa T,Ueno T,Devos Ndoi
10.3732/ajb.1200630subject
Has Abstractpub_date
2013-06-01 00:00:00pages
1202-20issue
6eissn
0002-9122issn
1537-2197pii
ajb.1200630journal_volume
100pub_type
杂志文章abstract：:Exotic plant species can threaten closely related native congeners through asymmetric hybridization and subsequent backcrossing, the process known as genetic assimilation. I explore the initial stages of this process in Taraxacum ceratophorum (Asteraceae), the native alpine dandelion, and the invasive apomict T. offic...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.5.656
更新日期：2004-05-01 00:00:00
abstract：:Inbreeding depression is a critical factor countering the evolution of inbreeding and thus potentially shaping the evolution of plant sexual systems. Current theory predicts that inbreeding depression could have important evolutionary consequences, even in haploid-dominant organisms. To date, no data have been reporte...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.11.1853
更新日期：2007-11-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1119
更新日期：2018-07-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100040
更新日期：2011-07-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1100066
更新日期：2011-08-01 00:00:00
abstract：:The fossil record of aquatic flowering plants broadens our understanding of their former diversity and origins from terrestrial ancestors. This paper describes a floating aquatic monocot from 71 whole plants and several isolated leaf fragments from Upper Cretaceous oxbow lake sediments in the Dinosaur Park Formation, ...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.94.4.609
更新日期：2007-04-01 00:00:00
abstract：:We sequenced the nuclear small subunit ribosomal DNA coding region from 20 members of the Bangiophycidae and from two members of the Florideophycidae to gain insights into red algal evolution. A combined alignment of nuclear and plastid small subunit rDNA and a data set of Rubisco protein sequences were also studied t...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2001-08-01 00:00:00
abstract：:Pinus baileyi from the Paleogene of Idaho was initially related to the bristlecone pine P. longaeva (subgen. Strobus, sect. Parrya, subsect. Balfourianae) from western North America. Unlike the centromucronate condition in P. longaeva, P. baileyi cones have raised umbos that are excentromucronate, i.e., the mucro posi...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.93.2.197
更新日期：2006-02-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1127
更新日期：2018-08-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-06-01 00:00:00
abstract：:The evolutionary history of maize (Zea mays subsp. mays) is of general interest because of its economic and scientific importance. Here we show that many cellular traits described previously in developing caryopses of maize are also seen in its wild progenitor teosinte (Zea mays subsp. parviglumis). These features, ea...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0900059
更新日期：2009-10-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1600208
更新日期：2016-10-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-09-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1300159
更新日期：2013-11-01 00:00:00
abstract：:The balance between clonal and sexual reproduction can vary widely among plant populations, and the extent of clonality may be influenced by the combined effects of historical land use and variation in environmental conditions. We investigated patterns of clonal spread in five Trillium cuneatum populations, two in the...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.2007159
更新日期：2008-10-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000525
更新日期：2011-06-01 00:00:00
abstract：:Yucca glauca is a C(3) evergreen rosette species locally common in the C(4)-dominated grasslands of the central Great Plains. Most congeners of Y. glauca are found in deserts, and Y. glauca's morphological similarities to desert species (steeply angled leaves, evergreen habit) may be critical to its success in grassla...
journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：2000-02-01 00:00:00
abstract：:In a 3-yr study, we examined the pollinator guild and intersexual floral characteristics of the dioecious, perennial cloudberry (Rubus chamaemorus), which flowers in early spring. The findings contribute to our general understanding of pollination ecology at high latitudes and provide important information for the com...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.0800102
更新日期：2009-06-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1999-06-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1300027
更新日期：2013-08-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1997-07-01 00:00:00
abstract：:Cacti are a large and diverse group of stem succulents predominantly occurring in warm and arid North and South America. Chloroplast DNA sequences of the trnK intron, including the matK gene, were sequenced for 70 ingroup taxa and two outgroups from the Portulacaceae. In order to improve resolution in three major grou...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.89.2.312
更新日期：2002-02-01 00:00:00
abstract：UNLABELLED: PREMISE OF THE STUDY:Diversification of floral traits in angiosperms is often attributed to have been driven by adaptations to pollinators. Nevertheless, phylogenetic studies on the relationships among evolutionary changes in floral traits and pollination systems are still limited. We examined the relation...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1200359
更新日期：2013-03-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000260
更新日期：2010-10-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1000408
更新日期：2011-06-01 00:00:00
abstract：:The origin of polyploid Bromus species of section Genea was investigated using molecular data. This group of annual species native from the Old-World is composed of three diploids, two tetraploids, one hexaploid, and one octoploid. Molecular cloning, sequencing, and phylogenetic analyses were performed on several acce...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.95.4.454
更新日期：2008-04-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.1500163
更新日期：2015-07-01 00:00:00
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journal_title：American journal of botany
pub_type： 杂志文章
doi：10.1002/ajb2.1186
更新日期：2018-11-01 00:00:00
abstract：:Phylogenetic relationships and biogeography of the genus Cerastium were studied using sequences of three noncoding plastid DNA regions (trnL intron, trnL-trnF spacer, and psbA-trnH spacer). A total of 57 Cerastium taxa was analyzed using two species of the putative sister genus Stellaria as outgroups. Maximum parsimon...
journal_title：American journal of botany
pub_type： 杂志文章
doi：10.3732/ajb.91.6.943
更新日期：2004-06-01 00:00:00
