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The Journal of Heredity 1994:85(4):303-306
© 1994 The American Genetic Association 85:303-306

other

Genetic Control of Diaphorase and Phosphoglucomutase Isozyme variants in Hexaploid Oat

C. A. Salas, and J. P. Murphy

Department of Crop Science, Box 7629, North Carolina State University Raleigh, NC 27695-7629

Address reprint requests to Dr J. P. Murphy at the address above

Abstract

Inheritance of diaphorase and phosphoglucomutase isozyme variants was investigated in nine F2 populations of hexaploid oat {Avena spp.) using starch gel electrophoresis. Three independent diaphorase loci-Dia-1, Dia-2, and Dia-3- were hypothesized to determine eight zymogram phenotypes An active (Dia-1) and a null (dia-1) allele were found at the Dia-1 locus, in agreement with a previous study. Allele Dia-2 was assumed to be fixed at the second locus, and codominant alleles (Dia-3a and Dia-3b) and a null allele (dia-3) were found at the Dia-3 locus Three independent phosphoglucomutase loci-Pgm-1, Pgm-2, and Pgm-3-were hypothesized to determine seven zymogram phenotypes. Allele Pgm-1 was assumed to be fixed at the first locus, and codominant (Pgm-2a and Pgm-2b) alleles and a null (pgm-2) allele were found at the Pgm-2 locus. Codominant (Pgm-3a and Pgm-3b) alleles and a null (pgm-3) allele were found at the Pgm-3 locus. Comigration of alleles Pgm-2b and Pgm-3a was observed. Allehc frequencies in cultivated and wild oat were compared, based on an interpretation of zymograph phenotypes of 1,410 hexaploid oat accessions from previous studies.


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