Abstract
A total of 6 population samples ofMyosotis stenophylla Knaf, a rare species showing great ecological disjunction in its distribution, were examined to clarify the present status of its karyological variation. In order to elucidate relationships between lowland tetraploid populations ofM. stenophylla and diploid and tetraploid montane populations ofM. alpestris F.W. Schmidt, four population samples ofM. alpestris were also examined. The karyotypes of all populations ofM. alpestris s.l. studied were highly asymmetrical and heterogeneous, being composed of metacentric, submetacentric, subtelocentric and satellited acrocentric chromosomes. The karyotype formula for haploid chromosome set was established: n=x=12=6m+2sm+3st+1tSAT. Multivariate analysis based on chromosome length and shape showed significant differences between diploid and tetraploid forms ofM. alpestris s.l. Four numerical parameters, used to characterize the karyotype ofM. stenophylla, revealed significant differences between populations on serpentine and on non-serpentine substrates. In addition, the noticeable affinity of the karyotype of non-serpentine populations to that ofM. alpestris tetraploids has been shown by means of discriminant analysis. These data suggest that the unique features of serpentine play an important role in the origin of karyotypic differentiation within populations ofM. stenophylla.
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References
Baker A.J.M., Proctor J. &Reeves R.D. (eds.) (1993):The vegetation of ultramafic (serpentine) soil. Intercept, Andover.
Brooks R.R. (1987):Serpentine and its vegetation: A multidisciplinary approach, Dioscorides Press, Portland.
Cobon A.M. &Murray B.G. (1983) Evidence for the absence of chromosome differentiation in populations ofSilene maritima With. growing on heavy-metal-contaminated sites.New Phytol. 94: 643–646.
Denton M.F. (1979): Factors contributing to evolutionary divergence and endemism inSedum sectionGormania (Crassulaceae).Taxon 28: 149–155.
Dubcovsky J. &Martínez A.J. (1992): Cytotaxonomy of theFestuca spp. from Patagonia.Canad. J. Bot. 70: 1134–1140.
Dvořáková M. (1988):Minuartia smejkalii, eine neue Art aus derMinuartia gerardii-Gruppe (Caryphyllaceae).Preslia 60: 1–9.
Grau J. (1964): Zytotaxonomie derMyosotis alpestris-und derMyosotis sylvatica-Gruppe in Europa.Öster. Bot. Z. 111: 561–617.
Higgins S.S. &Mack R.N. (1987): Comparative responses ofAchillea millefolium ecotypes to competition and soil type.Oecologia 73: 591–597.
Kruckeberg A.R. (1984): California serpentines: flora, vegetation, geology, soils and management problems.Univ. Calif. Publ. Bot. 78.
Kruckeberg A.R. (1986): An essay: the stimulus of unusual geologies for plant speciation.Syst. Bot. 11: 455–463.
Kruckeberg A.R. (1992): Plant life of western North American ultramafics. In:Roberts B.A. &Proctor J. (eds.),The ecology of areas with serpentinized rocks. A world view Kluwer Acad. Publ., Dordrecht, pp. 31–73.
Lausi D. &Cusma Velari T. (1986): Caryological and morphological investigations on a new zinc violet.Stud. Geobot. 6: 123–129.
Levan A., Fredga K. &Sandberg A.A. (1964): Nomenclature for centromeric position on chromosomes.Hereditas 52: 201–220.
Mayer M.S. &Soltis P.S. (1994): The evolution of serpentine endemics: A chloroplast DNA Physlogeny of theStreptanthus glandulosus complex (Cruciferae).Syst. Bot. 19: 537–574.
Mayer M.S., Soltis P.S. &Soltis D.E. (1994): The evolution of theStreptanthus glandulosus complex (Cruciferae): Genetic divergence and gene flow in serpentine endemics.Amer. J. Bot. 8: 1288–1299.
Murray B.G., Cameron E.K. &Standring L.S. (1992): Chromosome numbers, karyotypes, and nuclear DNA variation inPratia Gaudin (Lobeliaceae).New Zealand J. Bot. 30: 181–187.
Narayan R.K.J. (1982): Discontinuous DNA variation in the evolution of plant species: The genusLathyrus.Evolution 36: 877–891.
Novák F.A. (1960): Zur Phylogenie der Serpentin-typen.Preslia 32: 1–8.
Raven P.H. (1964): Catastrophic selection and edaphic endemism.Evolution 18: 336–338.
Roberts B.A. &Proctor J. (eds.) (1992):The ecology of areas with serpentinized rocks. A world view. Kluwer Acad. Publ., Dordrecht.
Rune O. (1953): Plant life on serpentines and related rocks in the North of Sweden.Acta Phytogeogr. Suec. 31: 1–139.
Rune O. &Westerbergh A. (1991): Phytogeographic aspects of the serpentine flora of Scandinavia. In:Baker A.J.M., Proctor J. &Reeves R.D. (eds.),The vegetation of ultramafic (serpentine) soil. Intercept, Andover., pp. 451–459.
Stebbins G.L. (1971):Chromosomal evolution in higher plants. Edward Arnold. London.
Štěpánková J. (1993a): Report onMyosotis L. In:Kamari G., Felber F. & Gabari F.. (eds.),Mediterranean chromosome number reports 3, Fl. Medit. 3: 323–373.
Štěpánková J. (1993b): Remarks on the karyogeography of theMyosotis alpestris in Europe.Preslia 65: 325–334.
Westerbergh A. &Saura A. (1992): The efect of serpentine on the population structure ofSilene dioica (Caryophyllaceae).Evolution 46: 1537–1548.
Zarco C.R. (1986): A new method for estimating karyotpe asymmetry.Taxon 35: 526–530.
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Štěpánková, J. Karyological variation in the group ofMyosotis alpestris (boraginacea) . Folia Geobot 31, 251–262 (1996). https://doi.org/10.1007/BF02812068
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DOI: https://doi.org/10.1007/BF02812068