SEGREGATION DISTORTION AND LINKAGE OF MANGO ISOZYME LOCI

The inheritance of five polymorphic enzyme systems, aconitase (AGO), i socitrate dehydrogenase (LDH), phosphoglucose isomerase (PGI), phospho glucomutase (PGM), and triosephosphate isomerase (TPI), was studied in selfed progenies of four mango (Mangifera indica L.) cultivars and se lections, Only in 'Haden' did the allozymes of all of the studied loci segregate in the expected Mendelian ratios. Distorted segregations we re present in the other cultivars at some loci; three of the five anal yzed in 'Edward' showed distorted segregations, as did two of three lo ci in '13/1', and both loci in '21/6', The distorted ratios in 'Edward ', a descendant of 'Haden', did not appear to be associated with gamet ic selection because pollen viability in both of these cultivars was h igh. The five enzymic loci were not linked to one another in 'Edward', '13/1', or '21/6', In 'Haden', however, Pgi-2 and Aco were linked, wi th a distance of about 19.4 map units.