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  • 1
    Electronic Resource
    Electronic Resource
    After a dozen years of progress the origin of angiosperms is still a great mystery (2007)
    [s.l.] : Nature Publishing Group
    Nature 450 (2007), S. 1184-1189 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Here we discuss recent advances surrounding the origin of angiosperms. Putatively primitive characters are now much better understood because of a vastly improved understanding of angiosperm phylogenetics, and recent discoveries of fossil flowers have provided an increasingly detailed picture ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature06393
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  • 2
    Electronic Resource
    Electronic Resource
    Angiosperm phylogeny inferred from multiple genes as a tool for comparative biology (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 402 (1999), S. 402-404 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Comparative biology requires a firm phylogenetic foundation to uncover and understand patterns of diversification and evaluate hypotheses of the processes responsible for these patterns. In the angiosperms, studies of diversification in floral form, stamen organization, reproductive biology, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/46528
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  • 3
    Electronic Resource
    Electronic Resource
    The earliest angiosperms: evidence from mitochondrial, plastid and nuclear genomes (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 402 (1999), S. 404-407 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Angiosperms have dominated the Earth's vegetation since the mid-Cretaceous (90 million years ago), providing much of our food, fibre, medicine and timber, yet their origin and early evolution have remained enigmatic for over a century. One part of the enigma lies in the difficulty of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/46536
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid and recent origin of species richness in the Cape flora of South Africa (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 181-183 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Cape flora of South Africa grows in a continental area with many diverse and endemic species. We need to understand the evolutionary origins and ages of such ‘hotspots’ to conserve them effectively. In volcanic islands the timing of diversification can be precisely measured with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35084067
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular variation in the Postia caesia complex (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 242 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: DNA sequences of the internal transcribed spacer (ITS) regions of nuclear ribosomal DNA (nrDNA) and small-subunit of mitochondrial ribosomal DNA (mt-rDNA) were obtained from 12 different collections initially identified as either Postia caesia or P. subcaesia based on morphological criteria. Sequences of ITS from British collections separate into three clear groups, each with identical sequences, regardless of the lignicolous host and distribution. These British collections can be distinguished morphologically as two groups, (a) thick and larger basidiomata (1.5–5.0 × 2.0–6.0 × 3.0–15 cm) with a strigose to tomentose pileus and (b) thin and smaller basidiomata (0.5–2.0 × 1.0–2.5 × 1.5–4.0 cm) with a smooth pileus. The former were all collected from hardwoods and the latter from both hardwoods and coniferous woods. Group (a) corresponds to one of the sequence groups, but group (b) displays two different sequences. Two collections from Norway, one from each of the morphological groups, exhibit further sequence variation within the ITS regions, although closer to those of British group (b). Representative sequences of mt-rDNA from each of the three British ITS sequence groups remain distinct, but those from the two Norwegian collections, however, are identical to one of the British groups. Further comparison of basidiospore size revealed no clear distinction among these groups, although the ratio of spore length to spore width is generally greater in group (a). Although there is no clear separation of these collections into two species, there is a clear tendency of variation at both morphological and molecular levels, among them. Differences in morphology and DNA sequences do not warrant species recognition, but do demonstrate high variability within the species complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2004.10.046
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  • 6
    Electronic Resource
    Electronic Resource
    Relationships in theAcanthaceae and related families as suggested by cladistic analysis ofrbcL nucleotide sequences (1995)
    Springer
    Plant systematics and evolution 194 (1995), S. 93-109 
    Details
    ISSN: 1615-6110
    Keywords: Bignoniales ; Acanthaceae ; Nelsonia ; Thunbergia ; Acanthoideae ; Ruellioideae ; Systematics ; rbcL ; cladistic analyses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A parsimony analysis of DNA sequences of the chloroplast-encoded generbcL from twelve members of theAcanthaceae s.l., including members of the sometimes segregateThunbergioideae andNelsonioideae, and other families in theBignoniales sensuThorne (1992) is presented. The results largely agree with the classification of theAcanthaceae presented byBremekamp (1965) andThorne (1992) and supportNelsonioideae as a sister group to the rest of theAcanthaceae. Thunbergioideae are placed as a sister toAcanthaceae s.str.Acanthus andAphelandra, both representatives ofAcanthoideae, form a sister group toRuellioideae. An analysis of branch support found that many branches throughout theBignoniales are weakly upheld. This points to the need for further studies in the group using more sequences ofrbcL as well as other data. None of the families ofBignoniales as presently circumscribed (includingAcanthaceae s.l.) were strongly supported, although the larger clade containing the families of theBignoniales was robust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983219
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  • 7
    Electronic Resource
    Electronic Resource
    Phylogenetics of the slipper orchids (Cypripedioideae, Orchidaceae): Nuclear rDNA ITS sequences (1997)
    Springer
    Plant systematics and evolution 208 (1997), S. 197-223 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Cypripedioideae ; Paphiopedilum ; Phragmipedium ; Cypripedium ; Selenipedium ; Mexipedium ; Molecular systematics ; rDNA ; ITS ; cytology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cypripedioideae (Orchidaceae) have been the subject of numerous taxonomic treatments with conflicting interpretations of relationships among the five genera and the 150–170 species. We have produced nuclear ribosomal ITS nucleotide sequences for nearly 100 slipper orchid species and used parsimony analysis to investigate their relationships. Our results demonstrate that each genus, as currently circumscribed, is monophyletic (Mexipedium andSelenipedium being represented by a single taxon). LikerbcL data, ITS sequences placeMexipedium sister toPhragmipedium. Relationships at the sectional level inPaphiopedilum are largely as described byCribb. However, the division ofPaphiopedilum into subgg.Brachypetalum andPaphiopedilum is not supported; subg.Brachypetalum is paraphyletic to subg.Paphiopedilum. Phragmipedium species are divided into the same three major clades as in the taxonomic scheme ofMcCook. The plicate-leaved genera,Cypripedium andSelenipedium, are successive sister groups to the rest of the subfamily, confirming generally held opinions that they display plesiomorphic characters compared to the conduplicate-leaved genera. A survey of karyotypes in the context of the ITS tree reveals a general trend toward increased chromosome number, probably brought about by centric fission. These data also accord with a previously suggested biogeographic hypothesis of a widespread Northern Hemisphere distribution, followed by range fragmentation due to Miocene cooling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985442
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  • 8
    Electronic Resource
    Electronic Resource
    Family relationships of the enigmatic rosid generaBarbeya andDirachma from the Horn of Africa region (1998)
    Springer
    Plant systematics and evolution 213 (1998), S. 103-119 
    Details
    ISSN: 1615-6110
    Keywords: Barbeyaceae ; Dirachmaceae ; Elaeagnaceae ; Rhamnaceae ; Rosaceae ; Ulmaceae ; Urticales ; Barbeya ; Dirachma ; Actinorhizal symbiosis ; plastid DNA ; monotypic plant families ; phylogeny ; rbcL ; rosids ; trnL-F ; Africa ; Arabia ; Socotra ; Somalia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Barbeya is a monotypic genus in the Horn of Africa and adjacent parts of Arabia. It is usually treated as the familyBarbeyaceae and regarded as an aberrant member ofUrticales. Dirachma, with one species on Socotra and one in Somalia, is usually treated as the familyDirachmaceae, inGeraniales, but a position inMalvales has also been suggested. Analyses of molecular data, from bothrbcL andtrnL-F, indicate thatBarbeya andDirachma are closely related inter se as well as toRhamnaceae andElaeagnaceae. In an analysis based on morphologyBarbeya groups withElaeagnaceae, andDirachma withRhamnaceae andUlmaceae. In a combined molecular and morphological analysisBarbeya is the sister group ofElaeagnaceae andDirachma is the sister group of the wholeBarbeya-Elaeagnaceae-Rhamnaceae clade. However, the support for these arrangements is weak and, rather than mergingBarbeyaceae withDirachmaceae as suggested by the molecular analysis or withElaeagnaceae as suggested by the morphological and combined analyses, it seems best to retain bothBarbeyaceae andDirachmaceae in their present circumscriptions, but in both cases in completely new positions in the angiosperm system. The results are compatible with a new circumscription ofRhamnales comprisingRhamnaceae, Elaeagnaceae, Dirachmaceae andBarbeyaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988911
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  • 9
    Electronic Resource
    Electronic Resource
    An assessment of suprageneric phylogeny inCyperaceae usingrbcL DNA sequences (1998)
    Springer
    Plant systematics and evolution 211 (1998), S. 257-271 
    Details
    ISSN: 1615-6110
    Keywords: Cyperaceae ; Phylogeny ; rbcL ; parsimony ; subfamilial classification ; tribal classification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phylogeny of suprageneric groups inCyperaceae has been examined by cladistic analysis ofrbcL sequence data of 80 species in 40 genera. The results support the family as monophyletic and derived from a juncaceous grade.Oxychloe (Juncaceae) has moderate support as the sister taxon toCyperaceae. Several monophyletic groups correspond to previously recognised tribes, and some similarities are noted between this analysis and previous cladistic analyses of primarily morphological data. Support is also given for the removal ofHellmuthia from tribeHypolytreae, the transfer ofIsolepis nodosa toFicinia, and the inclusion ofOxycaryum andKyllingiella in tribeCypereae. A polytomy comprisingCyperus, Juncellus, Kyllinga andPycreus indicates a broader circumscription ofCyperus. The greatest uncertainty lies with the generic and tribal status of theScirpeae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985363
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous parsimony jackknife analysis of 2538rbcL DNA sequences reveals support for major clades of green plants, land plants, seed plants and flowering plants (1998)
    Springer
    Plant systematics and evolution 213 (1998), S. 259-287 
    Details
    ISSN: 1615-6110
    Keywords: Parsimony jackknifing ; phylogenetic analysis ; large data sets ; rbcL ; DNA sequences ; green plants ; land plants ; seed plants ; flowering plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ever-larger data matrices resulting from continuing improvements in DNA sequencing techniques require faster and more efficient methods of phylogenetic analysis. Here we explore a promising new method, parsimony jackknifing, by analyzing a matrix comprising 2538 sequences of the chloroplast generbcL. The sequences included cover a broad taxonomic range, from cyanobacteria to flowering plants. Several parsimony jackknife analyses were performed, both with and without branch-swapping and multiple random addition sequences: 1) including all positions; 2) including only first and second codon positions; 3) including only third positions; and 4) using only transversions. The best resolution was obtained using all positions. Removal of third positions or transitions led to massive loss of resolution, although using only transversions somewhat improved basal resolution. While branch-swapping improved both resolution and the support found for several groups, most of the groups could be recovered by faster simple analyses. Designed to eliminate groups poorly supported by the data, parsimony jackknifing recognizes 1400 groups on the basis of allrbcL positions. These include major taxa such as green plants, land plants, flowering plants, monocots and eudicots. We include appendices of supported angiosperm families, as well as larger groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985205
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