Rye-derived powdery mildew resistance gene <Emphasis Type="Italic">Pm8</Emphasis> in wheat is suppressed by the <Emphasis Type="Italic">Pm3</Emphasis> locus |
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Authors: | Robert A McIntosh Peng Zhang Christina Cowger Ryan Parks Evans S Lagudah Sami Hoxha |
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Institution: | (1) Plant Breeding Institute Cobbitty, University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia;(2) USDA-ARS, Department of Plant Pathology, North Carolina State University, 3409 Gardner Hall, Raleigh, NC 27695-7616, USA;(3) CSIRO Plant Industry, PO Box 1600, Canberra, ACT, 2601, Australia |
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Abstract: | Genetic suppression of disease resistance is occasionally observed in hexaploid wheat or in its interspecific crosses. The
phenotypic effects of genes moved to wheat from relatives with lower ploidy are often smaller than in the original sources,
suggesting the presence of modifiers or partial inhibitors in wheat, especially dilution effects caused by possible variation
at orthologous loci. However, there is little current understanding of the underlying genetics of suppression. The discovery
of suppression in some wheat genotypes of the cereal rye chromosome 1RS-derived gene Pm8 for powdery mildew resistance offered an opportunity for analysis. A single gene for suppression was identified at or near
the closely linked storage protein genes Gli-A1 and Glu-A3, which are also closely associated with the Pm3 locus on chromosome 1AS. The Pm3 locus is a complex of expressed alleles and pseudogenes embedded among Glu-A3 repeats. In the current report, we explain why earlier work indicated that the mildew suppressor was closely associated with
specific Gli-A1 and Glu-A3 alleles, and predict that suppression of Pm8 involves translated gene products from the Pm3 locus. |
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