The present invention provides a method for producing plants with a desired phenotypic trait which comprises subjecting plants to mutagenesis, screening chimeric progeny for plants having the desired phenotypic trait, and propagating the survivors. In an embodiment, the phenotypic trait comprises an...http://www.google.de/patents/US6730832?utm_source=gb-gplus-sharePatent US6730832 - High threonine producing lines of Nicotiana tobacum and methods for producing
