Plant Genome I Conference
Town & Country Conference Center, San Diego, CA, November, 1992.
PG-I: 34pg1
ISOZYME AND RFLP VARIATION AMONG CARROTS AND OTHER DAUCUS
SPECIES
Philipp W. Simon, USDA, ARS, Vegetable Crops Research Unit,
Department of Horticulture, University of Wisconsin-Madison,
Madison, WI 53706
Substantial genetic variation was observed for isozymes and
RFLPs in carrot, Daucus carota L., and other Daucus species
evaluated. Included in this study were 19 carrot inbreds from
diverse genetic backgrounds; 6 broad-based synthetic populations
selected for sugar or carotene levels; 5 U.S. open-pollinated
cultivars; I three-way hybrid; 6 foreign open-pollinated
cultivars from Europe, Asia, Central America, and the Md-East; 6
wild Daucus including D. carota ssp. drepanensis Heywood, D.
aureus Desf., D. bicolor Sm., D. guttatus Sm., D. montevidensis
Link ex Sprengel, and D. muricatus L.; and 1 parsley
(Petroselinum crispus Mill.). Thirty one isozymes and RFLP
probes were polymorphic of 46 tested. As expected from taxonomic
considerations, D. bicolor and D. muricatus (section Platyspermum
DC) were generally more similar to each other and distinct from
other entries with D. aureus (section Chrysodaucus Thell.), and
parsley were generally unlike any other entries. Within section
Daucus, D. guttatus had fewer similarities with D. carota than
did D. montevidensis. Variation was extensive within cultivated
types and D. carota ssp. drepanensis was not separable from them
for these markers. Most open-pollinated cultivars and some
inbreds were polymorphic, generally well-correlated with the
extent of inbreeding.
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