Received: 25 July 2017 | Accepted: 23 February 2018 DOI: 10.1111/pbr.12591 ORIGINAL ARTICLE Genes for wheat stem rust resistance postulated in German cultivars and their efficacy in seedling and adult-plant field tests Kerstin Flath1 | Thomas Miedaner2 | Pablo D. Olivera3 | Matthew N. Rouse3,4 | Yue Jin3,4 1Institute for Plant Protection in Field Crops and Grassland, Julius-Kuehn-Institut Abstract (JKI), Kleinmachnow, Germany Stem rust of wheat (caused by Puccinia graminis f.sp. tritici) gained high international 2State Plant Breeding Institute, University attention in the last two decades, but does not occur regularly in Germany. Moti- of Hohenheim, Stuttgart, Germany 3Department of Plant Pathology, University vated by a regional epidemic in 2013, we analysed 15 spring and 82 winter wheat of Minnesota, St. Paul, MN, USA cultivars registered in Germany for their resistance to stem rust at the seedling 4 USDA-ARS Cereal Disease Laboratory, stage and tested 79 of these winter wheat cultivars at the adult-plant stage. A total St. Paul, MN, USA of five seedling stem rust resistance genes were postulated: Sr38 occurred most fre- Correspondence quently (n = 29), followed by Sr31 (n = 11) and Sr24 (n = 8). Sr7a and Sr8a occurred Thomas Miedaner, State Plant Breeding Institute, University of Hohenheim, Stuttgart, only in two spring wheat genotypes each. Four cultivars had effective seedling resis- Germany. tance to all races evaluated that could only be explained by postulating additional Email:
[email protected] resistance genes (‘Hyland’, ‘Pilgrim PZO’, ‘Tybalt’) or unidentified gene(s) (‘Memory’). € Communicated by: H. Burstmayr The three winter wheat cultivars (‘Hyland’‘Memory’ and ‘Pilgrim PZO’) were also highly resistant at the adult-plant stage; ‘Tybalt’ was not tested.