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  • 1
    Electronic Resource
    Electronic Resource
    Molecular Variation in Isolated Plant Populations (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant species biology 11 (1996), S. 0 
    Details
    ISSN: 1442-1984
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Isolated plant populations face a series of demographic and genetic challenges. They potentially may suffer from a loss of allelic and genotypic diversity or from inbreeding depression. The demographic stability associated with migration between components of a metapopulation is lost as fragmentation increasingly isolates populations. Such isolated populations are then increasingly subject to demographic stocasticity and to more frequent population bottlenecks. Some plant species clearly endure this challenge better than others. In studies of native plant species whose populations have long endured isolation, population numbers very often appear stable and populations often contain ample genetic variation. Of course, such observations are biased, since those species which did not accommodate isolation are presumed extinct and thus not studied.When one considers species which have recently undergone habitat fragmentation and population isolation, the ability to accommodate such change is clearly not present in many species. Such populations often show a dramatic decline in numbers as well as erosion of genetic variability. In these populations the role of somatic processes in the generation of genetic variation may assume an increased importance. Since only a few isolated studies have documented such somatic genomic changes in plants, the importance of such changes is subject to speculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-1984.1996.tb00106.x
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  • 2
    Electronic Resource
    Electronic Resource
    Chloroplast DNA variation and the phylogeny ofAsplenium sect.Hymenasplenium (Aspleniaceae) in the New World tropics (1994)
    Springer
    Journal of plant research 107 (1994), S. 245-251 
    Details
    ISSN: 1618-0860
    Keywords: Aspleniaceae ; Asplenium sect.Hymenasplenium ; Chloroplast DNA ; Evolution ; Molecular phylogeny ; New World tropics ; Restriction site variation analyses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Asplenium sect.Hymenasplenium is a well-defined group in Aspleniaceae, distinguished by several morphological and cytological characters. However, interspecific relationships in the section were not clear. In this paper, we report the phylogenetic relationships of 9 Neotropical species of sect.Hymenasplenium determined by chloroplast DNA restriction site variation analyses. From the obtained phylogenetic tree, two major clades: one withA. obtusifolium, A. riparium, A. volubile andA. repandulum and another withA. delitescens, A. ortegae, A. purpurascens, A. laetum andA. hoffmannii were recognized.Asplenium delitescens was shown to have a polyphyletic origin. It was also shown that the epiphytic habit evolved only once in the New World species of sect.Hymenasplenium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344251
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of gene flow in Lupinus texensis (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 450-451 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lupinus texensis Hook. (Leguminosae), the Texas bluebon-net, is a winter annual plant of widespread occurrence in central Texas. It is obligately outcrossing, and the pollen vectors are bees, predominantly Bombus pennsylvanicus and Apis melli-fera. Seeds of L. texensis are dispersed over distances ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284450a0
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation by distance in Liatris cylindracea (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 703-703 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Plant species are prime candidates for the study of isolation by distance since they are immobile and gene dispersal in both the pollen and seed phases is often quite restricted. Indeed the earliest study of isolation by distance was on the annual herb Linanthus parryae, which shows genetic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252703a0
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  • 5
    Electronic Resource
    Electronic Resource
    Age structure in Liatris acidota (Compositae) (1978)
    Springer
    Oecologia 32 (1978), S. 93-100 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ten populations of the perennial herb, Liatris acidota Engelm. & Gray (Compositae), growing on the Texas Gulf Coast (USA) were analyzed for age structure, frequency of predation, and frequency of asexual reproduction. Nine of the ten populations exhibited non-stable age distributions due to a deficiency of young non-seedling plants. Age structure was not related to levels of predation nor to the amount of asexual reproduction. Environmental perturdation is suggested as the cause of the observed deviation from a stable age distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344693
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  • 6
    Electronic Resource
    Electronic Resource
    Survivorship patterns in an annual plant community (1982)
    Springer
    Oecologia 54 (1982), S. 149-151 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Age-specific survivorship was studied in a number of plant species which occur in a distinct, predominantly annual plant community of Texas, in association with the activities of pocket gophers. Of eleven species analyzed in detail, all functioned as annuals. Contrary to theoretical expectations, the species had low rates of juvenile mortality, and did not exhibit the demographic specializations of weedy or colonizing species. It is suggested that the annual habit in this case may be adaptive in sites with continual disturbance, such as that due to pocket gopher activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378386
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  • 7
    Electronic Resource
    Electronic Resource
    The tetrapod “DNA fingerprinting” M13 repeat probe reveals genetic diversity and clonal growth in quaking aspen (Populus tremuloides, Salicaceae) (1991)
    Springer
    Plant systematics and evolution 175 (1991), S. 115-123 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Salicaceae ; Populus tremuloides ; Alpine community ecology ; clonal organisms ; DNA fingerprinting ; population genetics ; rflp analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A recently developed class of DNA endonuclease fragment probes (variously termed “minisatellite,” “DNA fingerprinting,” or “variable number tandem repeat loci” probes) has detected extensive intraspecific genetic variation in tetrapods. Here we use one probe from this class, the M 13 repeat probe (shown previously to yield ”DNA fingerprints” in humans) to examine genetic diversity in the quaking aspen. Comparisons of endonuclease fragment profiles of individuals separated by at least 6km reveals that diversification of alleles in this species has occurred to such an extent that the likelihood of two randomly chosen individuals having indistinguishableHaeIII fragment profiles is c. 3.17 × 10−4. Based on this finding, members of interdigitating clones can be assigned to one or another clone with high statistical confidence. Interdigitating, morphologically cryptic clones were also identifiable. These results demonstrate that some minisatellite probes can be applied to very distant taxa to obtain useful information about genetic variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937841
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  • 8
    Electronic Resource
    Electronic Resource
    Ribosomal DNA variation within and among individuals ofLisianthius (Gentianaceae) populations (1990)
    Springer
    Plant systematics and evolution 170 (1990), S. 97-106 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Gentianaceae ; Lisianthius ; Population variation ; ribosomal DNA ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Restriction endonuclease fragment analysis of nuclear ribosomal DNA (rDNA) was completed on 25 individuals each from seven populations of theLisianthius skinneri (Gentianaceae) species complex in Panama. Seven restriction enzymes were used to determine the amount and type of rDNA variation within and among individuals of the populations. No restriction site variation was seen within populations or individuals although site differences were seen among populations. Spacer length variation within and among individuals of populations was mapped to the internal transcribed spacer (ITS) region between the 18S and 5.8S rRNA genes, a region inLisianthius rDNA that previously was shown to exhibit length differences among populations. This is the first reported case of such variation within and among individuals of populations for the ITS region. Presence or absence of ITS spacer length variation is not correlated with levels of isozymic heterozygosity within populations. No detectable length variation within individuals or populations was seen in the larger intergenic spacer (IGS). Although populations varied with respect to IGS length, all individuals of a given population had a single and equivalent IGS length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937852
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  • 9
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    Diverse selective modes among orthologs/paralogs of the chalcone synthase (Chs) gene family of Arabidopsis thaliana and its relative A. halleri ssp. gemmifera (2007)
    Elsevier
    Details
    Publication Date: 2007-08-01
    Print ISSN: 1055-7903
    Electronic ISSN: 1095-9513
    Topics: Biology
    Published by Elsevier
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  • 10
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    RAPD variation within and between natural populations of the wild rice Oryza rufipogon from China and Brazil (1999)
    Springer Nature
    Details
    Publication Date: 1999-06-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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