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Gene flow between cultivated and wild sunflowers (1994)

Arias, D. M. ; Rieseberg, L. H.

Springer

Theoretical and applied genetics 89 (1994), S. 655-660

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ISSN: 1432-2242

Keywords: Hybridization ; Gene flow ; Sunflowers Transgenes

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract With the development of transgenic crops, concern has been expressed regarding the possible escape of genetically-engineered genes via hybridization with wild relatives. This is a potential hazard for sunflowers because wild sunflowers occur as weeds in fields where cultivated sunflowers are grown and hybridization between them has been reported. In order to quantify the potential for gene escape, two experimental stands of sunflower cultivars were planted at two sites with different rainfall and altitude profiles. Populations of wild plants were planted at different distances from each cultivar stand. An allele homozygous in the cultivar (6Pgd-3-a), but absent in the wild populations, was used as a molecular marker to document the incidence and rate of gene escape from the cultivar into the wild populations of sunflowers. Three-thousand achenes were surveyed to determine the amount of gene flow from the cultivated to the wild populations. The marginal wild populations (3 m from the cultivar) showed the highest percentage (27%) of gene flow. Gene flow was found to decrease with distance; however, gene flow occurred up to distances of 1000 m from the source population. These data suggest that physical distance alone will be unlikely to prevent gene flow between cultivated and wild populations of sunflowers.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00223700

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Geographic partitioning of chloroplast DNA variation in the genusDatisca (Datiscaceae) (1992)

Liston, A. ; Rieseberg, L. H. ; Hanson, M. A.

Springer

Plant systematics and evolution 181 (1992), S. 121-132

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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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