Simon: Release: B3080, B3640

UNITED STATES DEPARTMENT OF AGRICULTURE                          Agricultural Research Service                              Washington, D.C. 20250                  THE CALIFORNIA AGRICULTURAL EXPERIMENT STATION                           The University of California                              Davis, California 95616                                         and                    THE IDAHO AGRICULTURAL EXPERIMENT STATION                              The University of Idaho                                Moscow, Idaho 83843         RELEASE OF CARROT INBRED LINES B3080M, B3640S & M, and B2158-1 The U.S. Department of Agriculture and the California and Idaho Agricultural Experiment Stations announce the release of three carrot inbreds, B3080M, B3640S & M, and B2158-1 for use in production of market-type hybrid carrots. B3080M originated from a cross between two inbred maintainers.  An F3 line selected at Brawley, California, was increased under screen and crossed with petaloid male-sterile inbreds to identify acceptable single-cross hybrids and to determine if it would maintain sterility.  The F1 combination B3640S x 3080M was male sterile and produced satisfactory seed yields in pilot production plots in Idaho and Washington. B3640 and B2158-1 originated from an open-pollinated synthetic made up of several established maintainer lines derived from market varieties.  B3640S is in the BC4 generation.  B3640M and B2158-1 were advanced to S3, then mass selected for increase under screen.  All were selected at Brawley, California, for adaptability to growing conditions in the Imperial Valley. They are superior in color and uniformity to varieties currently popular in California. Seed produced under screen isolation will be distributed to carrot seed producers who make a request to:  Dr. C. E. Peterson, 211 Horticulture Building, University of Wisconsin, Madison, Wisconsin 53706, by June 25, 1976. ________________________________________              ____________       Director, California Agricultural                  Date Experiment Station   /s/ Raymond J. Miller                                 6/8/76 ________________________________________              ____________       Director, Idaho Agricultural                       Date Experiment Station ________________________________________              ____________       Administrator, ARS                                 Date

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