|Bowden, Robert - Bob|
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/13/2011
Publication Date: 11/1/2011
Citation: Fang, T., Garland Campbell, K.A., Liu, Z., Chen, X., Wan, A., Li, S., Liu, Z., Cao, S., Chen, Y., Bowden, R.L., Carver, B., Yan, L. 2011. Stripe rust resistance in the wheat cultivar Jagger is due to YR17 plus a novel QTL. Crop Science. 51:2455-2465. Interpretive Summary: Stripe rust (also known as Yellow rust) is one the most destructive diseases of wheat in the world. The important hard red winter wheat cultivar Jagger has been resistant to stripe rust since it's release. We rated stripe rust reaction in multiple locations in the US and China and determined that the resistance in Jagger is due to a well known major resistance gene, YR17, plus a new gene (QYr.osu-5A) on chromosome 5A. This result is important because Yr17 should be used with caution since the pathogen has mutated to overcome the resistance but the new gene may be useful in combination with other sources of resistance.
Technical Abstract: Yellow rust, also known as stripe rust, is caused by Puccinia striiformis West. f.sp. tritici and is one of the most common and persistent wheat diseases worldwide. A mapping population of recombinant inbred lines from the cross of ‘Jagger’ (moderately resistant) × ‘2174’ (moderately susceptible) was tested at three sites in Washington where predominant races PST-114 and PST-116 naturally occurred; at Rossville, Kansas where PST-100 was inoculated; and in Beijing, China where a predominant Chinese stripe rust race CYR32 was inoculated on adult plants. A major quantitative trait locus for adult-plant stripe rust resistance was located on the short arm of chromosome 2A (QYr.osu-2A), where Jagger was found to carry markers for resistance gene Yr17 from Triticum ventricosum. Thus, Yr17 is likely the resistance gene on chromosome 2A in Jagger. Markers for Yr17 were found to occur frequently in cultivars from the southern Great Plains but only occasionally in cultivars from other U.S. wheat regions. A novel resistance gene was mapped on the long arm of chromosome 5A (QYr.osu-5A), for which the Jagger allele showed consistent resistance to multiple races of the stripe rust pathogen. A significant genetic effect of the resistance gene Lr34/Yr18 from 2174 was detected only when the population was tested with CYR32 in China.