Genetics of stem rust resistance in the spring wheat cultivar Thatcher and the enhancement of stem rust resistance by <Emphasis Type="Italic">Lr34</Emphasis> |
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Authors: | Carmen D Gavin Vanegas David F Garvin James A Kolmer |
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Institution: | (1) Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, USA;(2) USDA-ARS Plant Science Research Unit, University of Minnesota, St. Paul, MN 55108, USA;(3) USDA-ARS Cereal Disease Laboratory, University of Minnesota, St. Paul, MN 55108, USA |
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Abstract: | Three recombinant inbred line populations from the crosses RL6071/Thatcher, RL6071/RL6058 (Thatcher Lr34), and Thatcher/RL6058, were used to study the genetics of stem rust resistance in Thatcher and TcLr34. Segregation of stem
rust response in each population was used to determine the number of genes conferring resistance, as well as the effect of
the leaf rust resistance gene Lr34 on stem rust resistance. The relationship between resistance in seedling and adult plants was also examined, and an attempt
was made to identify microsatellite markers linked to genes that were effective in adult plants. In field plot tests at least
three additive resistance genes segregated in the RL6071/RL6058 population, whereas two resistance genes segregated in the
RL6071/Thatcher population. The presence of the gene Lr34 permitted the expression of additional stem rust resistance in Thatcher-derived lines both at the seedling and adult plant
stages. Seedling resistance to races TPMK and RKQQ was significantly associated with resistance in adult plants, whereas seedling
resistance to races QCCD and QCCB may have made a minor contribution. The seedling resistance genes Sr16 and Sr12 may have contributed to resistance in adult plants. A molecular marker linked to resistance in adult plants was identified
on chromosome 2BL. |
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Keywords: | Durable resistance Puccinia graminis f sp tritici Specific resistance |
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