Segregation distortion and linkage of mango isozyme loci.
Aron Y., Czosnek H., Gazit S., Degani C.
Author Affiliation: Faculty of Agriculture, Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel.
HortScience 32 : 918-920
Abstract : The inheritance of five polymorphic enzyme systems, aconitase [aconitate hydratase] (ACO), isocitrate dehydrogenase (IDH), phosphoglucose isomerase [glucose-6-phosphate isomerase] (PGI), phosphoglucomutase (PGM), and triosephosphate isomerase [triose-phosphate isomerase] (TPI), was studied in selfed progenies of four mango (Mangifera indica) cultivars and selections. Only in cv. Haden did the allozymes of all of the studied loci segregate in the expected Mendelian ratios. Distorted segregations were present in the other cultivars at some loci; three of the five analysed in Edward showed distorted segregations, as did two of three loci 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 gametic selection because pollen viability in both of these cultivars was high. 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, with a distance of about 19.4 map units.