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  • 1
    Electronic Resource
    Electronic Resource
    The persistence of cultivar alleles in wild populations of sunflowers five generations after hybridization (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 33-40 
    Details
    ISSN: 1432-2242
    Keywords: Key words Gene flow ; Hybridization ; Sunflowers ; Transgenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The development of transgenic plants has heightened concern about the possible escape of genetically engineered material into the wild. Hybridization between crops and their wild relatives provides a mechanism by which this could occur. While hybridization has been documented between several crops and wild or weedy relatives, little is known about the persistence of cultivar genes in wild populations in the generations following hybridization. Wild and weedy sunflowers occur sympatrically with cultivated sunflowers throughout much of the cultivation range, and hybridization is known to occur. We surveyed two cultivar-specific RAPD markers in 2700 progeny in a naturally occurring population of wild Helianthus annuus over five generations following a single generation of hybridization with the cultivar. Moderate levels of gene flow were detected in the first generation (42% hybrids at the crop margin) and cultivar allele frequencies did not significantly decline over four subsequent generations. These results indicate that gene flow from cultivated into wild populations of sunflowers can result in the long-term establishment of cultivar alleles in wild populations. Furthermore, we conclude that neutral or favorable transgenes have the potential to escape and persist in wild sunflower populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050529
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  • 2
    Electronic Resource
    Electronic Resource
    Geographic partitioning of chloroplast DNA variation in the genusDatisca (Datiscaceae) (1992)
    Springer
    Plant systematics and evolution 181 (1992), S. 121-132 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Datiscaceae ; Datisca ; Chloroplast DNA ; polymerase chain reaction ; restriction-site variation ; interspecific variation ; disjunct distributions ; biogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Datisca (Datiscaceae) is a ditypic genus with an intercontinentally disjunct distribution. Chloroplast DNA restriction site data was obtained from 23 populations and four 10–20 year old herbarium specimens ofD. glomerata and three populations ofD. cannabina from throughout their geographic ranges in western North America and southwest-central Asia, respectively. InD. glomerata, plastome diversity is partitioned geographically. All populations from southern California have a common plastome, while most populations north of this region share a relatively divergent plastome (0.49% sequence divergence). Likewise, these plastomes are highly divergent (0.87% mean sequence divergence) from those found inD. cannabina. Biogeographic processes dating to the Pleistocene and Late Miocene may be responsible for these intra- and interspecific patterns of chloroplast DNA divergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937591
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    Paper (German National Licenses)
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