Inheritance and Linkage Relationships of Melon (Cucumis melo L.) Isozymes

in Journal of the American Society for Horticultural Science
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  • 1 Vegetable Crops Research, U.S. Department of Agriculture, Agricultural Research Service, Horticulture Department, University of Wisconsin, Madison, WI 53706
  • 2 Agricultural Institute of Slovenia, Ljubijana, Slovenia
  • 3 Crop Improvement and Protection Unit, U.S. Department of Agriculture, Agricultural Research Service, Salinas, CA 93905

Nineteen polymorphic and eleven monomorphic isozyme loci were identified in thirteen enzyme systems in a survey of four-hundred melon (Cucumis melo L.) accessions. Segregation of allozymes in F2 and backcross (BC) families for isozyme loci agreed with the expected 1:2:1 and 1:1 segregation ratios (P <0.01). Eleven isozyme loci were linked and were integrated to form a map containing two linkage groups spanning 98 cM with a mean linkage distance of ≈9 cM. Linkage groups (A and B) contain the following loci in the order: A Fdp-2, Pgd, Pgm, Mpi-1, Idh, and Ac, and B Pep-gl, Mdh-2, Mdh-4, Mdh-5, Mdh-6. The remaining eight loci (Acp-1, Acp-4, Ak-4, Fdp-1, Gpi, Mpi-2, Pep-la, and Pep-pap) segregated independently. The isozyme map constructed in this study provides genomic information for future linkage studies with economically important traits and concensus map construction through map merging.

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