GENETIC-ANALYSIS OF PHOSPHOGLUCOISOMERASE ISOZYMES IN CULTIVATED AND WILD-SPECIES OF SECTION CEPA IN ALLIUM

Phosphoglucoisomerase (PGI) was studied to establish the genetic syste m of the isozymes in section Cepa of Allium. The results of isozyme an alyses using 15 cultivars and clones in two cultivated species A. fist ulosum and A. cepa, eight strains in four wild species A. altaicum, A. galanthum, A. oschaninii and A. vavilovii and a total of 10 hybrids b etween A. fistulosum and A. cepa and between the cultivated and wild s pecies revealed that: I) PGI was a dimeric enzyme; 2) the two cultivat ed and four wild species had a common gene locus Pgi-1 where six allel es were identified; and 3) A. fistulosum had Pgi-1(F-1) and Pgi-1(F-2) , A. cepa had Pgi-1(A-1) and Pgi-1(A-2), A. altaicum had Pgi-1(F-1), A . galanthum and A. vavilovii had Pgi-1(A-1), and A. oschaninii had Pgi -1(A-1), Pgi-1(O-1) and Pgi-1(O-2) The intra- and inter-specific polym orphisms of PGI isozymes are expected to be valuable tools for the gen etics and practical utilization of the wild species in section Cepa.