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  • Chromosome counts  (1)
  • Cytotaxonomy  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Cytotaxonomical study ofSaxifraga seriesCeratophyllae s.l. (Saxifragaceae) (1995)
    Springer
    Plant systematics and evolution 197 (1995), S. 209-223 
    Details
    ISSN: 1615-6110
    Keywords: Saxifragaceae ; Saxifraga ser.Ceratophyllae ; Cytotaxonomy ; aneuploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosome numbers, mainly gametic, are given for 28 populations belonging to 13 species in ser.Ceratophyllae as circumscribed byWebb & Gornall. From a cytological point of view, we report or confirm the occurrence of aneuploidy in at least 8 of the 19 species recognized. This phenomenon, together with the technical difficulties inherent to the genus, is responsible for a number of incorrect or imprecise previous reports which are here questioned. Aneuploidy and the karyological instability behind it apparently reflect very active extant processes which might play an important role in the evolution of the group. Cytological and morphological data allow the recognition of four groups; one of them is likely to constitute a monophylectic group (ser.Ceratophyllae sensu stricto) but, the monophyly of the seriesCeratophyllae sensu lato is questioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984640
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  • 2
    Electronic Resource
    Electronic Resource
    Polyploid speciation inHedera (Araliaceae): Phylogenetic and biogeographic insights based on chromosome counts and ITS sequences (1999)
    Springer
    Plant systematics and evolution 219 (1999), S. 165-179 
    Details
    ISSN: 1615-6110
    Keywords: Araliaceae ; Hedera ; Chromosome counts ; polyploidy ; ITS sequences ; polymorphism ; concerted evolution ; phylogenetic analyses ; biogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variation in chromosome number and internal transcribed sequences (ITS) of nrDNA is used to infer phylogenetic relationships of a wide range ofHedera species. Polyploidy was found to be frequent inHedera, with diploid, tetraploid, hexaploid and octoploid populations being detected. Nucleotide additivity occurs in the ITS sequences of one tetraploid (H. hibernica) and two hexaploid species (H. maderensis, H. pastuchovii), suggesting that all three species originated by allopolyploidisation. ITS sequence polymorphism and nucleotide characters may indicate the presence of an ancient genome persistent only in some allopolyploid species. Phylogenetic analyses of ITS sequence data reveal two lineages ofHedera: one containing all sequences belonging to extant diploids plus the tetraploidH. algeriensis, and a second that includes this ancient ITS type and others exclusive to several polyploid species. The origin of the polyploids is evaluated on the basis of morphology, chromosome counts, ITS sequence polymorphism, and phylogenetic analyses. Reconstruction of reticulate evolution inHedera agrees with two allopolyploid areas on both sides of the Mediterranean basin. Morphological, molecular and cytological evidence also suggests an active dispersal ofHedera populations that may account for three independent introductions in Macaronesia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985577
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