Nachrichtenblatt des Deutschen Pflanzenschutzdienstes (2005) 57, 167-171

Antje Dietz-Pfeilstetter, Erhard Barg and Andrea Weber (2005)
Genexpression in gentechnisch veränderten virus- and herbizidresistenten Pflanzen im Gewächshaus and unter Freilandbedingungen
[Gene expression in transgenic virus resistant and herbicide resistant plants under greenhouse and under field conditions]
Nachrichtenblatt des Deutschen Pflanzenschutzdienstes 57 (8), 167-171
Abstract: Single gene traits can be easier transferred to other plants than traits mediated by multiple genes. A possible risk szenario for the transfer of plant characteristics like virus resistance from transgenic plants is the development of more competitive wild plants or the feralization of crop plants. As the expression of transgenes depends on the genetic background, outcrossing to other plants implies possible changes of the expression pattern including gene inactivation. Accompanying to a field release of genetically modified virus resistant and herbicide resistant sugar beet plants we therefore performed manual crosses with wild beets and with mangel beet in order to investigate the expression of the introduced transgenes and the level of resistance to the rizomania virus under green house as well as under field conditions. Under greenhouse conditions F₁ hybrids of mangel beet x sugar beet had transgene expression levels similar to those of.the transgenic parent lines with the exception of an inactivation of the cp gene expression in 2 of 43 mangel beet x L4 hybrids. In contrast, about half of the F₂ hybrids investigated under field conditions, showed severe reduction of cp gene expression at both field sites at one sampling date. This reduction was correlated with a high sun light intensity on the days before and during sampling. The results emphasize the importance of field release experiments for the assessment of transgenic plants and their progeny.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Database assignments for author(s): Antje Dietz-Pfeilstetter

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Beet necrotic yellow vein virus	Beet/sugarbeet (Beta vulgaris)	Germany