Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 3/10/2004
Publication Date: 7/1/2004
Citation: Pahalawatta, V., Chen, X. 2004. Inheritance of and molecular mapping of wheat and barley genes for resistance to inappropriate formae speciales of puccinia striiformis. National American Phytopathology Meetings. Phytopathology. 94(6):S80.
Technical Abstract: Most wheat genotypes are resistant to barley stripe rust caused by Puccinia striiformis f. sp. hordei (PSH) and most barley genotypes are resistant to wheat stripe rust caused by P. striiformis f. sp. tritici (PST). To determine genetics of wheat resistance to PSH and barley resistance to PST, crosses were made between wheat genotypes Lemhi (resistant to PSH) and PI 478214 (susceptible to PSH) and between barley genotypes Steptoe (resistant PST) and Russell (susceptible to PST). Seedlings of F1, BC1, F2, and F3 progeny from the wheat cross were tested with races PSH-14, PSH-48, and PST-21, and those from the barley cross were tested with races PST-41 and PST-45 under controlled greenhouse conditions. Based on genetic analyses of infection type data, Lemhi has a dominant gene for resistance to the PSH races and the gene is closely linked (0.3 cM) to Yr21 for resistance to PST-21; and Steptoe has a dominant and a recessive gene for resistance to races PST-41 and PST-45. Using the resistance gene analog polymorphism (RGAP) technique, the Lemhi gene for resistance to PSH and Yr21 were mapped on a linkage group on chromosome 1B with 11 RGAP markers. A linkage group for the dominant gene in Steptoe for resistance to PST was constructed with 12 RGAP markers. The results show that resistance in wheat and barley to inappropriate stripe rust pathogens is qualitatively inherited.