Simon: Release: B5280 |
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UNITED STATES DEPARTNENT OF AGRICULTURE AGRICULTURAL RESEARCH SERVICE WASHINGTON, D.C. 20250 with THE FLORIDA and CALIFORNIA AGRICULTURAL EXPERIMENT STATIONS RELEASE OF CARROT INBRED B5280 The United States Department of Agriculture, Agricultural Research Service, and the California and Florida Agricultural Experiment Stations, announce the release of a carrot inbred B5280 to provide germplasm for developing improved genotypes and producing proprietary hybrids. Two hybrid combinations with B5280 were included among 100 entries in 1986 Florida and California carrot trials. These two entries ranked 1 and 2 in Florida while one entry with B5280 as a parent, ranked among the top five in Califonia. In the 1987 Florida and California carrot trials, four hybrid combinations with B5280 were included among 71 entries. In Florida two of these entries ranked in the top five. In California three ranked in the top five (see Attachment). B5280 was derived from a cross made in 1980 at the University of Wisconsin between B6345 (a medium orange Chantenay-shaped inbred derived from 'Imperator 58', 'Long Chantenay', and 'Danvers 126') and B10138 (a dark orange Danvers-shaped inbred from 'Danvers 126'). Beginning with the F2 generation, selection was made for dark orange color and long, blunt, smooth root shape. Two generations beyond the F2, selection was also initiated for a mild, sweet flavor. The best of four plants self-pollinated in the 1984 breeding plots produced seed for field row 5280 in Florida and California. Now at F2MS2M2, B5280M is the result of six generations of selection for root shape and color and four generations of selection for culinary quality. A petaloid cytoplasmic male sterile counterpart, B5280S, is now at BC4. Roots of B5280 are 15-20 cm long, slightly tapered, blunt, very smooth, and dark orange. In 1985 to 1987, the average total carotene content was 280 to 305 ppm compared with 70 to 100 ppm in 'Imperator 58'. The flavor is sweet and mild with fairly succulent texture. Desirable smoothness, blunt shape, high color, and flavor is conferred to a limited number of hybrid combinations with B5280. B5280 tends to bloom late which limits its usefulness as a pollen parent but F1 hybrids with B5280 are abundant seed producers. Although selection for Alternaria leaf blight tolerance was not made in the development of B5280, hybrid combinations with B5280 in 1986 and 1987 had vigorous tops and minimal disease damage. ![]() |
Carrot Inbred B5280 page 2 Breeders seed of B5280M and B5280S will be pro-rated upon written requests before April 1, 1988, addressed to P.W. Simon, USDA, ARS, Department of Horticulture, University of Wisconsin, Madison, WI 53706. _________________________________ _________________________ Director, California Agricultural Date Experiment Station _________________________________ _________________________ Director, Florida Agricultural Date Experiment Station _________________________________ _________________________ Administrator, Agricultural Date Research Service ![]() |
Table 1. Average appearance scores of carrot hybrids evaluated by carrot breeders, seed producers, and growers in Florida and California trials. Florida, 1986a California, 1986b Mean Mean Entry No. Pedigree Cage Source Value Rank Value Rank 6851 (4367x36402)x5280 513-4 4.1 1 2.8 40.5 6850 (8080x2302)x5280 513-3 4.0 2 3.4 4 6848 (8080x2302)x5276 512-3 3.4 3 2.2 89 6772 Apache ARCO 3.3 4.5 2.8 36 6826 Orlando Gold 522-3 3.3 4.5 2.9 23 6835 PSK 3282 Peto 3.2 7 3.7 1 6828 (4367x3640)2x2566 526-3 2.3 53.5 3.5 2 6823 Carolong 524-2 2.7 18.5 3.4 4 6834 Savory 526-2 2.5 42 3.4 4 ________________________________________________________________________________________ Florida, 1987c California, 1987d Mean Mean Value Rank Value Rank 7399 (4367x3640)2x5280 631-6 3.9 1 4.4 1 7384 (4367x36402)xFN2-9 602-2 3.5 2.5 3.0 35 7378 (808Ox2302)x5280 513-3 3.5 2.5 3.7 4.5 7355 Discovery Northrup King 3.4 4.0 3.2 23 7356 (8O8Ox2302)x6486 615-3 1.6 69 4.0 2.5 7405 Dagger 78 ARCO 2.6 25.5 4.0 2.5 7397 (6439x6274)2x5280 631-5 2.7 20 3.7 4.5 ________________________________________________________________________________________ a - 39 judges b - 43 judges c - 41 judges d - 48 judges Scores: 5=excellent, 4=good, 3=fine, 2=poor, 1=unacceptable |