Manipulation of chromosomal segments from wild wheat for the improvement of bread wheat [Australia]
1990
Appels, R. | Lagudah, E.S. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry)
The 1RS chromosomes segment being used in Australian wheats is discussed in detail to present the molecular biological studies carried out on this chromosome segment as well as its agronomic contributions to wheat. Studies are also being carried out on the manipulation of the D genome of wheat. Within Australia the screening has begun of a collection of 420 accessions of Triticum tauschii (the donor of the D genome). Disease resistance has been sought and found for cereal cyst nematode, Septoria nodorum, Septoria tritici, Puccinia striiformis, P. recondita and P. graminis. At the DNA level the collection has been screened for variation at the 5SDna and Nor loci, as well as generating Pst (a restriction endonuclease) genomic clones, in preparation for providing RFLP markers for a genetic linkage map. Lines of T. tauschii showing high levels of disease resistance have been crossed directly to Australian wheat cultivars or are being used to form synthetic hexaploids by crossing to tetraploid wheats.
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