Cytogenetic approaches to breeding and propagation of male sterile parent lines for hybrid varieties of rye

The combined segregation of translocations and markers is investigated in backcrosses and F2s involving 17 monogenically inherited morphological markers and 8 reciprocal translocations in rye. Chromosomal location is established for an and atl (chromosome 1), dw3 (chromosome 11) ,dw2 , mo and Ps (chromosome 111), Igl (chromosome IV), wh (chromosome V) and br, ct2, gr, ti and wil (chromosome VI). (Chromosome nomenclature follows de Vries and Sybenga, 1976). Arm location is determined for an and atl (lb), Igl (IVb),wh (Va), br and ti (Via) and ct2, gr and wil (Vlb), using a number of translocation, derived trisomies. No markers could be localized on the satellite chromosome (VII). Four markers remain unlocalized: lg2 is not located in Via, sr is not linked with dw2, and wi2 shows independent segregation from wil and translocation 240, involving chromosomes II and VI. Reduced fertility of translocation homozygotes prevented the localization of ms. The correspondence between these findings and the linkage groups presented by Schlegel and Mettin (1982), as well as the relationship between our chromosome nomenclature and that of the Tritioinae are discussed.

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