Genetics of Resistance toFusarium oxysporumf. sp.melonisRaces 0, 1, and 2 in Muskmelon Line MR-1

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Abstract
In artificial inoculation studies, muskmelon (Cucumis melo) breeding line MR-1 was resistant to races 0, 1, and 2; but not 1,2 y or 1,2w of Fusarium oxysporum f. sp. melonis. Segregation ratios for F1, F2, and BC1 populations of crosses between resistant MR-1 and susceptible Topmark indicated that resistant to races 1 and 2 of Fusarium wilt is conferred by single dominant genes and that resistance to race 0 is also conferred by a single dominant gene. Linkage tests indicated that the genes for resistance to race 1 and race 2 assort independently. Allelism tests showed that the single dominant genes in MR-1 that confer resistance to races 0 and 2 and races 0 and 1 are the same genes or alleles of Fom-1 in differential cultivar Doublon and Fom-2 in differential line CM 17-187, respectively.