ISOZYME VARIATION IN SOME RACES OF MAIZE FROM ARGENTINA

Forty one populations of sixteen Argentine races of maize were studied with electrophoretic techniques. Seven isozyme systems coded by fifte en gene loci were used for studying the genetic variability within and among races and populations. In the whole sample was found that the v ariation within populations represented 78% of the isozymic variabilit y, the variation among races was 14% while the variation among populat ions within races was only 8%. Cluster analysis and Principal Componen t analysis indicated that most races were closely related. 'Cateto Ama rillo', 'Crave' and 'Perla Mediano' were the most distinctive of the A rgentine races.