Hybridization process utilizing a combination of cytoplasmic male sterility and herbicide tolerance
Patent 4517763 Issued on May 21, 1985. Estimated Expiration Date: 
May 11, 2003. 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.
May 11, 2003. 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 ReferencesProduction of alfalfa seeds Recessive tall--a fourth genetic element to facilitate hybrid cereal production Herbicide-tolerant plants Patent #: 4443971 InventorsAssigneeApplicationNo. 06/493511 filed on 05/11/1983US 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 are the key plants for use in the present process. Such cytoplasmic male sterile plants may be readily multiplied and uniformly produced in accordance with the process of the present invention on a relatively economical basis by crossing with suitable maintainer plants. 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 a succeeding generation to make possible the existence in an unharmed state of a substantially homogeneous stand of the desired plants which exhibit cytoplasmic herbicide tolerance. 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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