Seed germination in weedy Brassica campestris and its hybrids with B. napus: Implications for risk assessment of transgenic oilseed rape |
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Authors: | Lars Landbo Rikke B Jørgensen |
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Institution: | 1. Department of Ecology and Genetics, Aarhus University, Ny Munkegade Building 540, 8000, ?rhus, Denmark 2. Gene Technology and Population Biology, Ris? National Laboratory, 4000, Roskilde, Denmark
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Abstract: | We studied the germination behaviour of the following types of seeds: weedy Brassica campestris, oilseed rape (Brassica napus),
B. campestris (♀) × B. napus (♂), B. napus (♀) × B. campestris (♂) and, finally, seeds harvested on B. napus (♀) × B. campestris
(♂) hybrids in open pollination with B. campestris and B. napus. The seeds were germinated in Petri dishes, using three different
consecutive treatments and assaying the viability of non-germinated seeds with tetrazolium staining. B. campestris seeds varied
in the treatment they required in order to germinate and many seeds were dormant, in contrast to B. napus seeds, which lacked
dormancy. B. campestris (♀) × B. napus (♂) and B. napus (♀) × B. campestris (♂) seeds both resembled B. napus being non-dormant
whereas seeds harvested on B. napus (♀) × B. campestris (♂) hybrids were more B. campestris-like in germination behaviour.
We discuss implications for risk of transgene spread from oilseed rape to weedy B. campestris.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | crop-weed hybridisation dormancy heteroblasty isolating mechanism |
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