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  • Orchidaceae  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Chromosome numbers and evolution inOphrys (Orchidaceae) (1975)
    Springer
    Plant systematics and evolution 124 (1975), S. 125-138 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Ophrys ; comb. nov. ; O. holosericea subsp.gracilis ; subsp.parvimaculata ; subsp.pollinensis ; O. sipontensis ; Chromosome numbers: polyploidy ; aneuploidy ; aneusomaty ; B-chromosomes ; chromosome technique ; kinetochore staining ; hybridization ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The diploid basic chromosome number forOphrys is 2n = 36. Tetraploidy has been found inO. fusca agg. only. Aneuploidy and aneusomaty are wide-spread; supernumerary chromosomes behave B-like, but do not differ by shape or structure from A-chromosomes. A new staining method reveals clearly differentiated bipartite meiotic kinetochores. Evolutionary aspects of homogamic hybridization, chromosome instability, and of the basic chromosome number x = 18 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985498
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  • 2
    Electronic Resource
    Electronic Resource
    Hybriden und hybridogene Sippen ausOphrys bertolonii undO. atrata (Orchidaceae) (1975)
    Springer
    Plant systematics and evolution 124 (1975), S. 79-123 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Ophrys ; O. bertolonii agg. ; O. sphecodes agg. ; comb. nov. ; O. apulica ; O. benacensis O. garganica ; O. holosericea subsp.celiensis ; O. lutea subsp.minor. ; Population analyses ; hybrid character coherence ; homogamic hybrid taxa ; differentiation-hybridization cycles ; Flora of Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flower polymorphism in 15 ItalianOphrys populations (N = 282) was analysed in detail. Statistical and graphical evaluation of data demonstrates morphological relationships and amount of hybrid character coherence.O. bertolonii s. str. andO. atrata are stable parental taxa, but occasionally form hybrids and hybrid swarms. Much evidence suggests that it was through such homogamic hybridization, involving these and other species ofOphrys, that the stabilized taxaO. bertoloniiformis andO. promontorii (ecologically different, but sympatric with the parents on Gargano), andO. benacensis (geographically separated from the parents in the Insubric region) originated. These differentiation-hybridization cycles are linked to the break-down and new establishment of incomplete prezygotic crossing barriers (e.g. different flower biology, flowering time, habitat preference).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985497
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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