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Modelling gene flow between oilseed rape and wild radish. I. Evolution of chromosome structure.

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Title: Modelling gene flow between oilseed rape and wild radish. I. Evolution of chromosome structure.
Authors: Chèvre, A. M.1 chevre@rennes.inra.fr, Adamczyk, K.2, Eber, F.1, Huteau, V.1, Coriton, O.1, Letanneur, J. C.1, Laredo, C.2, Jenczewski, E.3, Monod, H.2
Source: Theoretical & Applied Genetics. Jan2007, Vol. 114 Issue 2, p209-221. 13p. 2 Diagrams, 4 Charts, 4 Graphs.
Subjects: Genetic engineering of crops, Brassica, Plant chromosome numbers, Herbicide-resistant crops, Plant hybridization, Pollinators
Abstract: The assessment of gene flow from crop species to weeds has found a new emphasis over the last years because of the marketing of transgenic crops and the possible selective advantage that crop (trans)gene may confer to the weeds. Several studies focused on the F1 interspecific hybrid production but few data are available on the factors affecting the genetic structure of advanced generations. It depends on the genomic structure of the species concerned as well as on the degree of their genome homology that affect the occurrence of intergenomic recombination. Oilseed rape ( Brassica napus, AACC, 2 n = 38)-wild radish ( Raphanus raphanistrum, RrRr, 2 n = 18), a distantly related weed, is a good model to address such questions. From seven male sterile oilseed rape lines carrying an herbicide tolerance transgene, F1 interspecific hybrids and four advanced generations were produced under field conditions with wild radish as pollinator. Observation of hybrid chromosome numbers across four generations revealed a high variability, especially in the “BC1” generation. A regression model was fitted in order to describe the relationship between parent and offspring chromosome numbers. The effects of generation, transgenic line and selection pressure on the mean relationship were investigated. The first two factors had an influence on the rate of decrease of chromosome numbers, whereas selection pressure resulted in the presence of an additional chromosome in the herbicide treated plants. The model provided a convenient framework for analysing how chromosome numbers evolve over successive hybridization events and it may prove useful as a basis for simulation-based approaches. [ABSTRACT FROM AUTHOR]
Copyright of Theoretical & Applied Genetics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Genetic+engineering+of+crops%22">Genetic engineering of crops</searchLink><br /><searchLink fieldCode="DE" term="%22Brassica%22">Brassica</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+chromosome+numbers%22">Plant chromosome numbers</searchLink><br /><searchLink fieldCode="DE" term="%22Herbicide-resistant+crops%22">Herbicide-resistant crops</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+hybridization%22">Plant hybridization</searchLink><br /><searchLink fieldCode="DE" term="%22Pollinators%22">Pollinators</searchLink>
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  Data: The assessment of gene flow from crop species to weeds has found a new emphasis over the last years because of the marketing of transgenic crops and the possible selective advantage that crop (trans)gene may confer to the weeds. Several studies focused on the F1 interspecific hybrid production but few data are available on the factors affecting the genetic structure of advanced generations. It depends on the genomic structure of the species concerned as well as on the degree of their genome homology that affect the occurrence of intergenomic recombination. Oilseed rape ( Brassica napus, AACC, 2 n = 38)-wild radish ( Raphanus raphanistrum, RrRr, 2 n = 18), a distantly related weed, is a good model to address such questions. From seven male sterile oilseed rape lines carrying an herbicide tolerance transgene, F1 interspecific hybrids and four advanced generations were produced under field conditions with wild radish as pollinator. Observation of hybrid chromosome numbers across four generations revealed a high variability, especially in the “BC1” generation. A regression model was fitted in order to describe the relationship between parent and offspring chromosome numbers. The effects of generation, transgenic line and selection pressure on the mean relationship were investigated. The first two factors had an influence on the rate of decrease of chromosome numbers, whereas selection pressure resulted in the presence of an additional chromosome in the herbicide treated plants. The model provided a convenient framework for analysing how chromosome numbers evolve over successive hybridization events and it may prove useful as a basis for simulation-based approaches. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Theoretical & Applied Genetics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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