| 摘要 |
The present invention relates to a selection marker system for distinguishing genetically modified plant cells from wild-type plant cells comprising (a) a nucleic acid sequence coding for choline oxidase, choline monooxygenase and/or choline dehydrogenase for genetically modifying at least a part of a plant and; (b) at least a part of a wild-type plant of the same plant species, wherein the part of the plant which is genetically modified by the nucleic acid sequence coding for choline oxidase, choline monooxygenase and/or choline dehydrogenase is capable of surviving in a medium containing choline at a concentration which is toxic to the wild-type plant. Furthermore, the invention relates to a method for screening and/or identifying a choline tolerant plant cell and the use of a nucleic sequence coding for a choline oxidase, choline monooxygenase and/or choline dehydrogenase as a selection marker for choline tolerance.
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