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  • 1
    Digitale Medien
    Digitale Medien
    Differentiation of fourHordeum sect.Stenostachys spp. (Poaceae: Triticeae) using multivariate morphometrics (1989)
    Springer
    Plant systematics and evolution 166 (1989), S. 211-223 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Triticeae ; Hordeum brachyantherum ; H. californicum ; H. capense ; H. secalinum ; Morphometrics ; cluster analysis ; classificatory discriminant analysis ; canonical analysis ; sheared principal component analysis ; bootstrap validation ; identification key
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Field collections and 296 herbarium sheets were examined for 27 morphometric variables. A priori species identifcation was based on geographical distribution except forH. californicum, a diploid species primarily occurring in California and differing from the much more widespread tetraploidH. brachyantherum that thrives in N. America and N.E. Asia;H. capense grows in S. Africa andH. secalinum mainly in Europe. Various cluster analyses were used followed by cluster recovery verification. Classificatory discriminant analysis and validation by the bootstrap yielded 85–90% overall total correct classification of the four species. Canonical analysis revealed thatH. californicum occupies an intermediate phenetic position among the other three distinct species. Factors of shape differences were unravelled and portrayed by shearing. A revised key to species was drawn up.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00935950
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  • 2
    Digitale Medien
    Digitale Medien
    Distinctions betweenHordeum bulbosum andH. murinum s.l. in seed and herbarium collections (1985)
    Springer
    Plant systematics and evolution 149 (1985), S. 205-210 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae (Gramineae) ; Hordeum bulbosum ; H. murinum ; Seed collections ; lodicule characters ; spikelet morphology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract It is sometimes necessary to identify eitherH. bulbosum orH. murinum on the basis of the inflorescence or “seeds” alone. The majority of taxonomic keys use the presence of swollen basal culms for the former against the annual habit for the latter. Confusion is due to similarities in inflorescences and spikelet morphology. Lodicules which always persist and are present beside the fruit in a mature caryopsis, and other characters such as the awns of the lemmas of the lateral spikelets enable conclusive distinction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00983306
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  • 3
    Digitale Medien
    Digitale Medien
    An overview of evolution in plant 5S DNA (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 169-181 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Plant 5S DNA ; spacer variation ; sequence conservation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The DNA sequence properties of 5S DNA (5S RNA gene plus spacer) from a wide range of families of plants is reviewed with particular reference to the possibility of using the information for phylogenetic inference. Although the data-base is extremely limited, the available evidence suggests that within a subclass or tribe phylogenetic inference can be made, provided that a knowledge about the number of chromosomal locations of the gene loci (5S Dna loci) is available. The evidence suggests little, if any, exchange occurs between the 5S DNA units at different chromosomal loci and the available data favour a mechanism involving amplification/deletion processes for creating structural changes at the5S Dna loci. Sequences originating from species in the familiesRosaceae, Poaceae, andBrassicaceae tended to group together in cladistic analyses but with low confidence limits. Surprisingly little of the spacer region showed conservation of sequence that may relate to a function in the control of transcription by RNA polymerase III.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940801
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  • 4
    Digitale Medien
    Digitale Medien
    The 5S DNA units ofAcacia species (Mimosaceae) (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 235-247 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Mimosaceae ; Acacia ; 5S DNA ; evolution ; phylogeny ; chromosomal lineages
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The DNA sequence structure of 5S DNA units inAcacia species, including representatives from the three subgenera ofAcacia, have been determined. The data was interpreted to suggest that at least three lineages of 5S DNA sequences exist inAcacia and the proposal was made that the lineages be named5S Dna-1, 5S Dna-2, and5S Dna-3. The5S Dna-1 lineage was represented by units fromA. boliviana andA. bidwilli, the5S Dna-2 lineage by units fromA. melanoxylon, A. pycnantha, A. ulicifolia, A. boliviana, A. bidwillii, andA. albida, and the5S Dna-3 lineage by units fromA. bidwillii, A. boliviana, andA. senegal. Based on this interpretation of the sequence data, the Australian species of subg.Phyllodineae grouped together as a cluster, quite separate from the subgeneraAculeiferum andAcacia. As expected from the analyses of morphological characters, the 5S DNA units fromAcacia albida (syn.Faidherbia albida) were quite separate from the otherAcacia spp.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940806
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  • 5
    Digitale Medien
    Digitale Medien
    Ribosomal DNA spacer-length variation inSecale spp. (Poaceae) (1990)
    Springer
    Plant systematics and evolution 171 (1990), S. 205-220 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Secale ; Ribosomal DNA ; spacer subrepeats ; restriction fragment length polymorphism (RFLP) ; phenetic relationships
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Variation in ribosomal DNA spacer length was analysed in 23 populations of 12Secale spp. by restriction enzyme analysis. Digestion of rDNA with Taq I endonuclease enzyme yields spacer fragments that include the subrepeat array and the non-repetitive region downstream of the array. Extensive spacer length variation existed in most species with Taq I fragment lengths ranging from 0.9–3.1 kb. These length variants have been attributed to the differences in number of 134 bp spacer subrepeats within rDNA arrays.S. silvestre was the only species to exhibit a unique spacer length variant of 0.9 kb and this was shown to result from the presence of an extra Taq I site in the spacer. rDNA spacer length frequencies were determined for the species. These frequencies were used to derive phenetic relationships between the species by numerical taxonomic methods. In plots constructed fromGower's distance matrices,S. silvestre appeared well separated from the major cluster consisting of the other species. On the basis of morphological and cytogenetic criteria,S. silvestre is considered the most ancient species. The rDNA data is consistent with this interpretation as it shows a clear differentiation ofS. silvestre from all the other species based on length and nucleotide sequence composition of the spacer region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940606
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  • 6
    Digitale Medien
    Digitale Medien
    Kengyilia habahenensis (Poaceae: Triticeae) — a new species from the Altai mountains, China (1991)
    Springer
    Plant systematics and evolution 174 (1991), S. 103-108 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Triticeae ; Kengyilia habahenensis ; spec. nova ; Taxonomy ; genome analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Kengyilia habahenensis, spec. nova, from the Altai mountains, China, is described morphologically and cytologically. It has 2n = 42 chromosomes, and the genome formula PYS.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00937698
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