NULLISOMIC AND MONOSOMIC ANALYSES OF GENES CONTROLLING LEAF PEROXIDASES IN OATS

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Abstract
Monosomics derived from oat cultivars ''Cherokee'' (M monosomics) and ''Kanota'' (MK monosomics) were used in an attempt to locate gene Px-5a and its allele Px-5b that control leaf peroxidase bands F (fast) and M (median), respectively, and an independent gene Px-6a also controlling band M. M monosomics have band M, and MK monosomics have bands F and M. Nullisomic and monosomic analyses revealed that monosomic MK7 gave a peroxidase banding pattern consistently different from other MK monosomics. Monosomic progeny of MK7 had F and M bands, but nullisomic progeny had only the F band. Monosomic F1 hybrids between MK7 and Columbia (null) and MK7 and Garton 784 had only band F. Px-6a, controlling leaf peroxidase band M, was probably located on the monosome of MK7, and Px-5a and its allele Px-5b must be on a different chromosome. The monosome in MK7 is a SM chromosome.