Publikationsserver der RWTH Aachen University
Beta vulgaris subsp. maritima an Deutschlands Ostseeküste : Kartierung, genetische und physiologische Charakterisierung und ihre Rolle als Kreuzungspartner für transgene Zuckerrüben
Abstract
dc:descriptionB. vulgaris subsp. maritima (wild beet) has reached a high importance in the context of the deliberate release of genetically modified cultivated beets: as potential crossing partner it faciliates an uncontrollable outcrossing of genetically modified traits. In Germany, it occurs within a short distance to sugar beet fields in the region of the Baltic Sea. The aim of this study was to characterise these Baltic populations in detail. This way, baseline-data can be generated to measure possible ecological effects of transgenic sugar beets. It was shown * that the documented beets are really true wild beets and not escaped cultivated beets. A characteristic of cytoplasmic male sterility (CMS), that occurs in cultivated and weed beets, could not be found in the investigated populations. * that B. vulgaris subsp. maritima has established during the last years at Germany's Baltic Sea coast. It still seems to spread out. In 1997 there have been 62 individuals at 5 locations, in 2001 there have been more than 560 individuals at 16 locations. * that increasing warmer winters could be the reason for this spread. At least since 1997, beginning of the investigation, there have been warmer winters in comparison to the last decades. * that one part of the Baltic populations bolts and flowers in the first year and it seems to be heterozygous for the gene B. This disagrees with the general acceptance, that northern European wild beets would flower in the second year and are homozygous recessive (bb) for the gene. Together with vegetation periods long enough, this could be a further reason for the spread of B. vulgaris subsp. maritima. * that the Baltic wild beets have a relatively low genetic diversity (18.28%) and a close relationships among themselves. Compared to further European populations in a dendrogram, they form their own, isolated cluster. With regard to a monitoring after deliberate release of transgenic cultivated beets, the mapping work should go on and regular investigations of the genetic diversity should carried out. That way natural variation could be noticed and a possible additional effect after deliberate release could early be detected. Via specific markers (i.e. CMS), geneflow from cultivated beet fields to wild beet habitats can be measured.
Degree
thesis:*- Grantor dc:publisher
- Publikationsserver der RWTH Aachen University
- Year dc:date
- 2003
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Drießen, Sarah
- Contributors dc:contributor
-
- Bartsch, Detlef
Subjects
dc:subject × 17Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- ger
Identifiers
dc:identifier.*- OAI identifier oai:identifier
- oai:publications.rwth-aachen.de:61996