Resistance to Cephus cinctus Norton,the wheat stem sawfly,in a recombinant inbred line population of wheat derived from two resistance sources |
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| Authors: | Luther E Talbert Jamie D Sherman Megan L Hofland Susan P Lanning Nancy K Blake Reagan Grabbe Peggy F Lamb John M Martin David K Weaver |
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| Institution: | 1. Department of Plant Sciences and Plant Pathology, Montana State University, , Bozeman MT, 59717 USA;2. Department of Land Resources and Environmental Sciences, Montana State University, , Bozeman, MT, 59717 USA;3. Department of Research Centers, Montana State University, , Bozeman, MT, 59717 USA |
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| Abstract: | Several species of wheat stem sawflies (WSS) are pests of wheat, including Cephus cinctus Norton in North America. Larvae feed inside the stems and cut the stem near plant maturity. The primary means of control is resistance due to solid stems, largely controlled by a locus on chromosome 3B (Qss.msub‐3BL). Cultivars that differed for WSS resistance, but with similar stem solidness, were crossed to determine the genetic basis for the differences. The cultivar ‘Scholar’ is susceptible, while ‘Conan’ shows resistance. Scholar and Conan possessed different alleles at Qss.msub‐3BL. Both alleles conferred solidness, yet the Conan allele conferred higher WSS resistance. An allele from Conan on chromosome 4A also decreased infestation and stem cutting. The 3B and 4A alleles from Conan acted in an additive fashion to provide increased WSS resistance without increasing stem solidness. Stem solidness has long been used by breeders as a proxy for WSS resistance because of its simplicity. Our results suggest that other resistance mechanisms may complement solid stems. |
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| Keywords: | wheat stem sawfly genetics quantitative trait loci resistance |
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