GENETIC-STUDY OF ALCOHOL-DEHYDROGENASE PO LYMORPHISM IN PEACH (PRUNUS-PERSICA L BATSCH)

Alcohol dehydrogenase (ADH, EC 1.1.1.1) was studied in peach using fet al protein extracts of leaves. Leaves were harvested from orchard grow n frees in April and May, since, after this period, there was a large decrease in ADH activity. The enzymatic system of ADH is complex and i nvolves 3 loci, ie ADH-1, ADH-2 and ADH-3. From these 3 loci, intra- a nd intergenic dimeric enzymes are formed. The ADH-3 locus has 2 allele s, ADH-3L and ADH-3R. These were both identified within a family resul ting from self-pollination of a heterozygous individual.