Hybridization using cytoplasmic male sterility, cytoplasmic herbicide tolerance, and herbicide tolerance from nuclear genes
Patent 4658085 Issued on April 14, 1987. Estimated Expiration Date: 
November 14, 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.
November 14, 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 References 3842538 Production of alfalfa seeds Hybrid wheat Recessive tall--a fourth genetic element to facilitate hybrid cereal production High purity hybrid cabbage seed production Herbicide-tolerant plants Hybridization process utilizing a combination of cytoplasmic male sterility and herbicide tolerance Inhibition resistant 5-enolpyruvyl-3-phosphoshikimate synthetase, production and use Route to hybrid soybean production Patent #: 4545146 InventorsAssigneeApplicationNo. 06/797916 filed on 11/14/1985US Classes:800/266, Method of breeding involving a genotypic or phenotypic marker800/274, Via a male sterility genetic trait800/300, Herbicide resistant plant which is transgenic or mutant800/303, Male-sterile800/306BrassicaExaminersPrimary: Feyrer, James R.Attorney, Agent or FirmInternational ClassA01H 1/02 (20060101)AbstractThe process of the present invention provides a convenient route for producing a predetermined hybrid variety of a crop which is capable of undergoing both self-pollination and cross-pollination. Cytoplasmic male sterile plants which also exhibit cytoplasmic herbicide tolerance (i.e., to a Type A herbicide) and tolerance to a different herbicide attributable solely to nuclear genes (i.e., to a Type B herbicide) are the key plants for use in the present process. The maintainer and restorer plants exhibit tolerance to different herbicides (i.e., to either a Type A herbicide or a Type B herbicide). The economical bulk planting of the parent plants is made possible during each step of the process. For instance, cytoplasmic male sterile plants, plants resulting from the self-pollination of a maintainer, and restorer plants can be grown in a substantially random population, with the self-pollinated maintainer plants being destroyed by an appropriate herbicide prior to pollination, and the self-pollinated restorer plants being destroyed by an appropriate herbicide immediately following pollination or in the subsequent generation. The process of the present invention is applicable to grain crops, forage crops, seed-propagated fruits, seed-propagated ornamentals, and industrial species. In a particularly preferred embodiment a predetermined variety of Brassica napus (i.e., rape or improved forms thereof known as canola) is formed which is the product of cross-pollination.Other References
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