Leaf rust and stripe rust resistance genes transferred to common wheat from Triticum dicoccoides |
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| Authors: | G F Marais Z A Pretorius C R Wellings B McCallum A S Marais |
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| Institution: | (1) Department of Genetics, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa;(2) Department of Plant Sciences, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa;(3) Plant Breeding Institute, University of Sydney, PMB 11, Camden, NSW, 2570, Australia;(4) Cereal Research Centre, Agriculture and Agri-food Canada, 195 Dafoe Road, R3T 2M9 Winnipeg, Manitoba, Canada |
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| Abstract: | Linked leaf rust and stripe rust resistance genes introduced from Triticum dicoccoides protected common wheat seedlings against a range of pathotypes of the respective pathogens. The genes were chromosomally mapped using monosomic and telosomic analyses, C-banding and RFLPs. The data indicated that an introgressed region is located on wheat chromosome arm 6BS. The introgressed region did not pair with the ‘Chinese Spring’ 6BS arm during meiosis possibly as a result of reduced homology, but appeared to pair with 6BS of W84-17 (57% of pollen mother cells) and ‘Avocet S’. The introgressed region had a very strong preferential pollen transmission (0.96–0.98) whereas its transmission through egg cells (0.41–0.66) varied with the genetic background of the heterozygote. Homozygous resistant plants had a normal phenotype, were fertile and produced plump seeds. Symbols Lr53 and Yr35 are proposed to designate the respective genes. |
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| Keywords: | P striiformis tritici Puccinia triticina wide hybridization |
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