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A total of 1,307 urediniospore isolates of Puccinia recondita were collected from the eight agroecological areas of wheat adaptation in Texas and characterized for virulence to a set of 14 Thatcher near-isogenic lines. Thirty-seven virulence combinations were detected. The most prevalent virulence phenotypes found were MFB-10 (virulent to Lr1, Lr3, Lr10, Lr24, and Lr26) and MDB-10 (virulent to Lr1, Lr3, Lr10, and Lr24), constituting 11 and 10% of the isolates, respectively. In all areas, virulence to Lr11, Lr24, and Lr26 increased, and virulence to Lr16 decreased (...)
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David Marshall (1992) studied this question.
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