Tryptophan overproducer mutants of cereal crops
Patent 4642411 Issued on February 10, 1987. Estimated Expiration Date: 
February 21, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 21, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesHerbicide-tolerant plants Patent #: 4443971 InventorsAssigneeApplicationNo. 06/703972 filed on 02/21/1985US Classes:800/268, Method of breeding involving a tissue culture step435/410, PLANT CELL OR CELL LINE, PER SE (E.G., TRANSGENIC, MUTANT, ETC.); COMPOSITION THEREOF; PROCESS OF PROPAGATING, MAINTAINING, OR PRESERVING PLANT CELL OR CELL LINE; PROCESS OF ISOLATING OR SEPARATING A PLANT CELL OR CELL LINE; PROCESS OF REGENERATING PLANT CELLS INTO TISSUE, PLANT PART, OR PLANT, PER SE, WHERE NO GENOTYPIC CHANGE OCCURS; MEDIUM THEREFORE435/412, Corn cell or cell line, per se435/424, Involving corn cell or tissue435/430.1, Involving callus or embryonic stage800/270, Method of breeding involving a mutation step800/320, Gramineae (e.g., barley, oats, rye, sorghum, millet, etc.)800/320.2, Rice800/320.3WheatExaminersPrimary: Bagwill, Robert E.Attorney, Agent or FirmInternational ClassesA01H 5/10 (20060101)C12N 9/88 (20060101) C12N 15/82 (20060101) C12N 15/01 (20060101) C12N 5/04 (20060101) AbstractThis invention is direction to the production of novel plant genotypes or lines which produce increased free tryptophan levels and are resistant to inhibition by analogs which normally inhibit the activity of the enzyme anthranilate synthase before alteration. This invention further relates to genes encoding such exzymes, and to processes for utilizing these novel genes and enzymes. Further products of the invention include plants, plant tissues and seeds which exhibit resistance to such analogs and overproduce tryptophan resulting from expression of genes encoding analog resistant anthranilate synthase enzyme.Other References
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