Abstract
Wheat stripe rust is a destructive disease that affects most wheat-growing areas worldwide. Resistance genes from related species and genera add to the genetic diversity available to wheat breeding programs. The stripe rust-resistant introgression line H9020-17-25-6-4 was developed from a cross of resistant Psathyrostachys huashanica with the susceptible wheat cultivar 7182. H9020-17-25-6-4 is resistant to all existing Chinese stripe rust races, including the three most widely virulent races, CYR32, CYR33, and V26. We attempted to characterize this new line by genomic in situ hybridization (GISH) and genetic analysis. GISH using P. huashanica genomic DNA as a probe indicated that the translocated segment was too small to be detected. Genetic analysis involving F1, F2, and F2:3 materials derived from a cross of Mingxian 169 and H9020-17-25-6-4 indicated that a single dominant gene from H9020-17-25-6-4, temporarily designated YrHu, conferred resistance to CYR29 and CYR33. A genetic map consisting of four simple sequence repeat, two sequence-tagged site (STS), and two sequence-related amplified polymorphism markers was constructed. YrHu was located on the short arm of chromosome 3A and was about 0.7 and 1.5 cM proximal to EST-STS markers BG604577 and BE489244, respectively. Both the gene and the closely linked markers could be used in marker-assisted selection.
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Acknowledgments
The research was supported by the National Basic Research Program of China (2013CB127700), National Science Foundation of China (31501620), Natural Science Funds of Hubei Province of China (2014CF367) and Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement (2014lzjj06), and the Open Project Program of State Key Laboratory of Crop Stress Biology for Arid Areas (CSBAA2015012). We thank Prof. R. A. McIntosh and Dr. Meinan Wang for critical review of the manuscript.
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Ma, D.F., Fang, Z.W., Yin, J.L. et al. Molecular mapping of stripe rust resistance gene YrHu derived from Psathyrostachys huashanica . Mol Breeding 36, 64 (2016). https://doi.org/10.1007/s11032-016-0487-6
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DOI: https://doi.org/10.1007/s11032-016-0487-6