Abstract:

The advanced progeny lines (BC₁F₅) from the monosomic addition lines between common wheat cultivar Mianyang 11, which is highly susceptible to powdery mildew, and an inbred rye line R12 were analyzed for selection of wheat-rye translocations. Based on a rye-specific repetitive sequence of pSc20H, which spread over all chromosomes of rye but did not existed in wheat, a set of PCR primer was designed and used to identify the rye chromosome segments in wheat. From 300 of the BC₁F₅ progeny lines 70 were found to contain chromosome composition of rye. An advanced line, 96Ⅱ691-830-98, originated from 6R monosomic addition line was observed to be immune to powdery mildew, different from its wheat parent Mianyang 11. A small segment of rye chromosome at telomere in a pair of wheat chromosome in the line was found by means of GISH. The results indicated that a small segment of rye chromosome 6R carrying the gene(s) for resistance to powdery mildew has been transferred into common wheat. In the progeny of monosomic addition lines a high frequency of wheat-alien species translocation with various segments of chromosomes could be found by application of both PCR and GISH technique.