HOMOLOGOUS SYNAPSIS DISTORTION IN MEIOTIC MUTANTS OF DIPLOID RYE

Research was performed on the manifestation and inheritance of two spo ntaneous mutations isolated from different rye populations and causing desynapsis and decreased ferfility. Both mutations are inherited mono genically. The genes were designated sy7 and sy10; allelism was not st udied. The mutants differed in the degree of chromosome coiling, the n umber of chiasmata per bivalent, and the frequency of univalents in me taphase and of chromosome bridges in anaphases. The sy10 mutants exhib ited chromatin links between homologous and nonhomologous chromosomes in diakinesis and metaphase I of nonchiosmatic origin. In sublines tha t segregated at the gene sy10 two sterile triploid plants and two plan ts that were heterozygous at the translocation were detected.