Abstract
Wheat mutants, selected on an altered resistance phenotype to Puccinia striiformis f.sp. tritici, the causal agent of yellow rust, were assessed in greenhouse tests to determine the growth stage at which the mutant phenotype was expressed and which components of yellow rust resistance were altered. Four of the mutants showed reduced levels of yellow rust infection, while three exhibited increased levels of infection. The infection characters altered were those seen after the establishment of hyphal growth, i.e. days after inoculation to sporulation, the percentage of inoculated leaf tissue producing sporulating colonies and the number of spores produced per cm2 of inoculated leaf tissue. The altered resistance phenotype was developmentally regulated in all of the mutants. The changes seen in the infection characters differed for each mutant, suggesting that different genes may have been altered. An altered resistance phenotype to brown rust and/or powdery mildew was also seen for some of the yellow rust mutants.
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Boyd, L.A., Minchin, P.N. Wheat mutants showing altered adult plant disease resistance. Euphytica 122, 361–368 (2001). https://doi.org/10.1023/A:1012948702416
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DOI: https://doi.org/10.1023/A:1012948702416