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Genetic and linkage analysis of isozyme polymorphisms in flax



Genetic and linkage analysis of isozyme polymorphisms in flax



Journal Of Heredity. 84(1): 73-77



In an initial step toward developing a genetic map of flax (Linum), the inheritance and linkage relationships of seven isozyme polymorphisms were studied. Three polymorphic loci--Dia1, Pgm1, and Ap-1, each with codominant alleles--were found responsible f or the mobility variants observed on diaphorase, phosphoglucomutase, and acid phosphatase-stained gels, while three polymorphic loci--Ap-2, Lap1, and Pgd1, each with recessive null alleles-were found responsible for the observed acid phosphatase, leucine aminopeptidase, and 6-phosphogluconate dehydrogenase variants with missing bands. An additional leucine amino-peptidase variant with a missing band was found to be the result of a seventh polymorphic locus (Lap2), which has incompletely dominant null and normal activity alleles. The loci Dia 1 and Pgm1 were found to be linked approximately 28 cM apart, while all 16 additional pairs of loci tested segregated independently. Analysis of 25 near-isogenic lines (NILS), each selected for the rust resistance genotype of its nonrecurrent parent, indicated that Pgd1 may be linked with the M rust resistance loci.

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