GENETIC-VARIABILITY THROUGH ISOZIMIC POLYMORPHISMS IN HEXAPLOID OATS

Analysis of isozymes have many applications in plant breeding speciall y in the study of genetic variability. Isozymes are direct product of genic expression and may help to understand the evolutionary relation between species, and allow to identify the potential genotypes for bre eding programs. This work aimed to identify genetic variability throug h esterase polymorphism and to estimate genetic similarity among three hexaploid oat groups. Nine cultivated oat genotypes, three introducti ons of A. sterilis L., and 16 introductions of A. fatua L. were used. Wide polymorphisms of isozyme were observed within and between studied groups. The electrophoretic analysis showed 13 different bands with a nodical migration between the genotypes. Although several bands were c ommon for all genotypes, some of them were typical for a particular he xaploid group. These results indicate high genetic similarity between cultivated oat and A. fatua group. The A. sterilis group was more dive rgent, due to a more differentiated electrophoretic pattern.