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     The California Cooperative Rice Research Foundation, Inc. (CCRRF), the University of California Agricultural Experiment Station, and the United States Department of Agriculture, Agricultural Research Service (USDA-ARS), announce the naming and release of a new rice cultivar M-105.

     M-105 is a very early, semidwarf, California glabrous, Calrose quality medium-grain cultivar that has been evaluated in large plot yield tests since 2005 under the experimental designation 05-Y-471. It is a very early selection from the Rice Experiment Station (RES) 2000 summer greenhouse cross R25878 and has the pedigree S-301/M-204//M-104. The female parent S-301/M-204 (98-Y-242) was later released as M-206, and is currently the predominant medium-grain cultivar in California. M-104 is a very early maturing, cold tolerant, medium-grain rice also released by CCRRF. 05-Y-471 first entered the UC Statewide Rice Yield Testing Program in 2006 and has been tested in both the very and early locations and included replicated strip trial in three locations in 2010. M-105 is the product of pedigree breeding utilizing a Hawaii winter and RES nurseries for generation advance and purification.

     Days to heading average about 2 days later or earlier than M-104 and M-206, respectively. Multiple years of agronomic testing showed a comparable yield potential to current Calrose varietiesUC Statewide 2006-10 plot yields in very early tests averaged 9130, 9250, and 9460 lbs/acre for M-104, M-105, and M-206, respectively; and in early tests 9560 and 9610 lbs/acre for M-105 and M-206, respectively. Harvest moisture milling studies have been conducted since 2008 and show the percent head rice yield and milling stability to be superior to M-104 and equivalent to M-206. Milling samples have been provided to several major California rice marketing organizations in 2009 and 2010 and no concerns expressed. Pedigree, physicochemical test, and cooking tests indicate it fits the historical Calrose market type.

     M-105 is adapted to all current rice growing areas and may find application for growers seeking an earlier maturing Calrose market type cultivar with good milling and high yield potential in all but the coldest production areas.

     Approximately 600 cwt of foundation seed was produced in 2010 at RES. The Certification Technical Committee of the California Crop Improvement Association approved M-105 for certification in California. Application is being made to protect M-105 under the U.S. Plant Variety Protection Act, Title V option, and for utility patents. Breeder and Foundation seed of these cultivars will be maintained by California Cooperative Rice Research Foundation, P.O. Box 306, Biggs, CA 95917-0306.