G. F. Marais

TL;DR: Twenty-nine lines with deletions in the Lr19 ('Indis') translocated chromosome segment were used to physically map three Thinopyrum RFLP loci as well as the Sr25 and Sd1 loci, confirming the reported homoeology between the LR19 segment and chromosome arm 7DL of wheat.

TL;DR: The ‘Chinese Spring’ ph1b and ph2b mutants, as well as the nulli 5B tetra 5D stock were utilized in an attempt to effect homoeologous chromatin exchange between the ‘Indis’ chromosome translocation and chromosome arm 7DL of common wheat.

TL;DR: The Lr56/Yr38 translocation consists primarily of alien-derived chromatin with only the 6AL telomeric region being of wheat origin, and attempts to identify the single shortest translocation and to develop appropriate markers are being continued.

TL;DR: Preliminary indications are that the Gc effect had largely been removed and it now seems possible to completely separate the gametocidal genes from the S13 leaf rust resistance gene (here designated Lr66).

TL;DR: Following the induction of allosyndetic pairing between the Thinopyrum-derived Lr19 translocation in ‘Indis’ wheat and homoeologous wheat chromatin, eight suspected recombinants for the Lr 19 region were recovered and it was confirmed that the translocated segment in at least one of them had been shortened through recombination with chromosome arm 7DL.