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  • 1
    Electronic Resource
    Electronic Resource
    Gene flow inAgrostis tenuis (Poaceae) (1980)
    Springer
    Plant systematics and evolution 134 (1980), S. 23-31 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Poaceae ; Agrostis tenuis ; Copper tolerance ; Selection ; gene flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The copper tolerance of both adult plants and their seedlings, ofAgrostis tenuis from sites within and outside, but neighbouring the Parys Mountain mine (North Wales) were studied. Intensive sampling was carried out along a line starting from the mine boundaries to a distance of five miles away in the direction of the prevailing wind, and of two miles in an upwind direction. The test have shown that mine populations are very tolerant. In outside populations on soils with reduced of very low copper content the mean tolerance level of the seedlings is considerably higher than that of corresponding adult plants, while both show a gradual decrease in tolerance with distance from the mine. The gene flow moves in the direction of the prevailing wind transfering tolerant characters from the mine to the normal populations. The selective pressures on the toxic soil of the mine are quite strong and permit ± tolerant plants only, while on normal soils these pressures are not so severe, so that populations may be rather heterogenous regarding their tolerance towards copper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985029
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  • 2
    Electronic Resource
    Electronic Resource
    Zinc and copper effects on metal-tolerant and non-tolerant clones ofAgrostis tenuis (Poaceae) (1980)
    Springer
    Plant systematics and evolution 134 (1980), S. 173-182 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Poaceae ; Agrostis tenuis ; Tolerance to toxic heavy metals ; Cu ; Zn ; and combinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The toxicity of various Cu and Zn concentrations, as well as their mutual influence upon tolerant and non-tolerant clones ofAgrostis tenuis originating from soils of different metal content has been studied. Specific resistance has been clearly established. Co-existence of toxic metals causes an increase in toxicity. Uptake of metals (Cu and Zn) obviously occurs rather independently, and the toxic activity of the one is not affected competitively by the presence of the other. Above normal concentrations of Cu and Zn negatively affect cell division and growth in roots of non-tolerant genotypes. There is less ability to store metals than in tolerant genotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986797
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  • 3
    Electronic Resource
    Electronic Resource
    Selective adaptation to copper of populations ofAgrostis tenuis andFestuca rubra (Poaceae) (1980)
    Springer
    Plant systematics and evolution 134 (1980), S. 215-228 
    Details
    ISSN: 1615-6110
    Keywords: Poaceae (Gramineae) ; Agrostis ; Festuca ; Tolerance to heavy metals ; Cu ; selection ; rapid adaptability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Populations ofAgrostis Tenuis andFestuca rubra, tolerant and non-tolerant towards Zn and Pb, were studied in regard to their adaptability by natural selection, towards a third metal (Cu) and the time required for the appearance of such tolerance. It was found that Zn and Pb tolerant and non-tolerant populations are likely to select the character of Cu-tolerance within the course of only one generation. More specifically, Zn and Pb tolerant populations show a better adaptability compared with non-tolerant ones. The amount of tolerance to copper obtained by artificial selection is comparable with that of populations growing naturally on copper mines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986801
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  • 4
    Electronic Resource
    Electronic Resource
    Aegilops cylindrica var.kastorianum (Poaceae): A new variety from Greece (1989)
    Springer
    Plant systematics and evolution 163 (1989), S. 13-20 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Poaceae ; Aegilops cylindrica var.kastorianum ; New variety ; karyotype analysis ; protein and esterase patterns ; isoelectric focusing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A native population ofAegilops cylindrica was encountered for the first time in Greece in 1980 (near Kastoria, NW. Greece), completely isolated and at a great distance from its main distribution area. There are morphological and chromosomal, but no protein and esterase pattern differences from otherAe. cylindrica populations. This justifies the recognition of a new variety: var.kastorianum. Our comparative and karyotypic observations support the view thatAe. caudata var.polyathera and not var.caudata (typica) is the possible donor of genome C of the new variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936148
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