Hybridization using cytoplasmic male sterility and herbicide tolerance from nuclear genes
Patent 4658084 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. 06/797917 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 herbicide tolerance attributable solely to nuclear genes are the key plants for use in the present process. Economical bulk planting of the key plants with either maintainer or restorer plants is made possible. Following cross-pollination from a pollen source which lacks the herbicide tolerance unneeded plants effectively are eliminated by use of a herbicide. For instance, unwanted plants may be effectively eliminated immediately after pollination or prior to pollination in the succeeding generation (provided the requisite genes for herbicide tolerance are present therein) to make possible the existence in an unharmed state of a substantially homogeneous stand of the desired plants. In a preferred embodiment cytoplasmic male sterile plants, plants resulting from the self-pollination of a maintainer, and restorer plants are planted in a substantially random population prior to the application of two different herbicides (as defined) at the appropriate times. 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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