INHERITANCE AND LINKAGE RELATIONSHIPS OF MELON (CUCUMIS-MELO L.) ISOZYMES

Nineteen polymorphic and eleven monomorphic isozyme loci were identifi ed in thirteen enzyme systems in a survey of four-hundred melon (Cucum is melo L.) accessions. Segregation of allozymes in F-2 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 wer e integrated to form a map containing two linkage groups spanning 98 c M with a mean linkage distance of approximate to 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 rema ining eight loci (Acp-1, Acp-4, Ak-4, Fdp-1, Gpi, Mpi-2 Pep-la, and Pe p-pap) segregated independently. The isozyme map constructed in this s tudy provides genomic information for future linkage studies with econ omically important traits and concensus map construction through map m erging.