Person: Yue Jin
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- Field resistance to wheat stem rust in durum wheat accessions deposited at the USDA National Small Grains Collection(CSSA, 2021) Olivera Firpo, P.D.; Worku Denbel Bulbula; Badebo, A.; Bockelman, H.; Edae, E.A.; Yue Jin
Publication - Mapping and validation of stem rust resistance loci in spring wheat line CI 14275(Frontiers, 2021) Kosgey, Z.C.; Edae, E.A.; Dill-Macky, R.; Yue Jin; Worku Denbel Bulbula; Gemechu, A.; Macharia, G.; Bhavani, S.; Randhawa, M.S.; Rouse, M.N.
Publication - Identification of seedling resistance to stem rust in advanced wheat lines and varieties from Pakistan(CSSA, 2020) Rehman, M.U.; Gale, S.; Brown-Guedira, G.; Yue Jin; Marshall, D.; Whitcher, L.W.; Williamson, S.; Rouse, M.N.; Ahmad, J.; Ahmad, G.; Shah, I.A.; Mehboob Ali Sial; Rauf, Y.; Rattu, A.; Mirza, J.I.; Ward, R.W.; Nadeem, M.; Ullah, G.; Imtiaz, M.
Publication - Stem rust resistance in wheat is suppressed by a subunit of the mediator complex(Nature Publishing Group, 2020) Hiebert, C. W.; Moscou, M.J.; Hewitt, T.; Steuernagel, B.; Hernández-Pinzón, I.; Green, P.; Pujol, V.; Peng Zhang; Rouse, M.N.; Yue Jin; McIntosh, R.A.; Upadhyaya, N.; Jianping Zhang; Bhavani, S.; Vrána, J.; Karafiátová, M.; Li Huang; Fetch, T.; Dolezel, J.; Wulff, B.B.H.; Lagudah, E.; Spielmeyer, W.
Publication - Characterization of Ethiopian wheat germplasm for resistance to four Puccinia graminis f. sp. tritici races facilitated by single-race nurseries(American Phytopathological Society (APS), 2019) Kotu, B.H.; Girma, B.; Tadesse, Z.; Edae, E.A.; Olivera Firpo, P.D.; Hailu, E.; Worku Denbel Bulbula; Abeyo Bekele Geleta; Badebo, A.; Cisar, G.; Brown-Guedira, G.; Gale, S.; Yue Jin; Rouse, M.N.In Ethiopia, breeding rust resistant wheat cultivars is a priority for wheat production. A stem rust epidemic during 2013 to 2014 on previously resistant cultivar Digalu highlighted the need to determine the effectiveness of wheat lines to multiple races of Puccinia graminisf. sp. tritici in Ethiopia. During 2014 and 2015, we evaluated a total of 97 bread wheat and 14 durum wheat genotypes against four P. graminis f. sp. tritici races at the seedling stage and in single-race field nurseries. Resistance genes were postulated using molecular marker assays. Bread wheat lines were resistant to race JRCQC, the race most virulent to durum wheat. Lines with stem rust resistance gene Sr24 possessed the most effective resistance to the four races. Only three lines with adult plant resistance possessed resistance effective to the four races comparable with cultivars with Sr24. Although responses of the wheat lines across races were positively correlated, wheat lines were identified that possessed adult plant resistance to race TTKSK but were relatively susceptible to race TKTTF. This study demonstrated the importance of testing wheat lines for response to multiple races of the stem rust pathogen to determine if lines possessed non-race-specific resistance.
Publication - Genetic loci conditioning adult plant resistance to the Ug99 Race group and seedling resistance to races TRTTF and TTTTF of the stem rust pathogen in wheat landrace CItr 15026(American Phytopathological Society (APS), 2017) Babiker, E.M.; Gordon, T.; Bonman, J.M.; Shiaoman Chao; Rouse, M.N.; Yue Jin; Newcomb, M.; Wanyera, R.; Bhavani, S.Wheat landrace CItr 15026 previously showed adult plant resistance (APR) to the Ug99 stem rust race group in Kenya and seedling resistance to Puccinia graminis f. sp. tritici races QFCSC, TTTTF, and TRTTF. CItr 15026 was crossed to susceptible accessions LMPG-6 and Red Bobs, and 180 double haploid (DH) lines and 140 recombinant inbred lines (RIL), respectively, were developed. The 90K wheat iSelect single-nucleotide polymorphism platform was used to genotype the parents and populations. Parents and 180 DH lines were evaluated in the field in Kenya for three seasons. A major quantitative trait locus (QTL) for APR was consistently detected on chromosome arm 6AS. This QTL was further detected in the RIL population screened in Kenya for one season. Parents, F1, and the two populations were tested as seedlings against races TRTTF and TTTTF. In addition, the DH population was tested against race QFCSC. Goodness-of-fit tests indicated that the TRTTF resistance in CItr 15026 was controlled by two complementary genes whereas the TTTTF and QFCSC resistance was conditioned by one dominant gene. The TRTTF resistance loci mapped to chromosome arms 6AS and 6DS, whereas the TTTTF and QFCSC resistance locus mapped to the same region on 6DS as the TRTTF resistance. The APR identified in CItr 15026 should be useful in developing cultivars with durable stem rust resistance.
Publication - Overview of stem rust epidemics in eastern Africa and races causing the epidemics(USDA, 2016) Hodson, D.P.; Yue Jin; Hovmoller, M.S.
Publication - Nested association mapping of stem rust resistance in wheat using genotyping by sequencing(Public Library of Science, 2016) Bajgain, P.; Rouse, M.N.; Tsilo, T.J.; Macharia, G.; Bhavani, S.; Yue Jin; Anderson, J.We combined the recently developed genotyping by sequencing (GBS) method with joint mapping (also known as nested association mapping) to dissect and understand the genetic architecture controlling stem rust resistance in wheat (Triticum aestivum). Ten stem rust resistant wheat varieties were crossed to the susceptible line LMPG-6 to generate F6 recombinant inbred lines. The recombinant inbred line populations were phenotyped in Kenya, South Africa, and St. Paul, Minnesota, USA. By joint mapping of the 10 populations, we identified 59 minor and medium-effect QTL (explained phenotypic variance range of 1% – 20%) on 20 chromosomes that contributed towards adult plant resistance to North American Pgt races as well as the highly virulent Ug99 race group. Fifteen of the 59 QTL were detected in multiple environments. No epistatic relationship was detected among the QTL. While these numerous small- to medium-effect QTL are shared among the families, the founder parents were found to have different allelic effects for the QTL. Fourteen QTL identified by joint mapping were also detected in single-population mapping. As these QTL were mapped using SNP markers with known locations on the physical chromosomes, the genomic regions identified with QTL could be explored more in depth to discover candidate genes for stem rust resistance. The use of GBS-derived de novo SNPs in mapping resistance to stem rust shown in this study could be used as a model to conduct similar markertrait association studies in other plant species.
Publication - Kenyan Isolates of Puccinia graminis f. sp. tritici from 2008 to 2014: virulence to SrTmp in the Ug99 race group and implications for breeding programs(American Phytopathological Society (APS), 2016) Newcomb, M.; Olivera Firpo, P.D.; Rouse, M.N.; Szabo, L.J.; Johnson, J.W.; Gale, S.; Luster, D.G.; Wanyera, R.; Macharia, G.; Bhavani, S.; Hodson, D.P.; Patpour, M.; Hovmoller, M.S.; Fetch, T.; Yue JinFrequent emergence of new variants in the Puccinia graminis f. sp. tritici Ug99 race group in Kenya has made pathogen survey a priority. We analyzed 140 isolates from 78 P. graminis f. sp. tritici samples collected in Kenya between 2008 and 2014 and identified six races, including three not detected prior to 2013. Genotypic analysis of 20 isolates from 2013 and 2014 collections showed that the new races TTHST, TTKTK, and TTKTT belong to the Ug99 race group. International advanced breeding lines were evaluated against an isolate of TTKTT (Sr31, Sr24, and SrTmp virulence) at the seedling stage. From 169 advanced lines from Kenya, 23% of lines with resistance to races TTKSK and TTKST were susceptible to TTKTT and, from two North American regional nurseries, 44 and 91% of resistant lines were susceptible. Three lines with combined resistance genes were developed to facilitate pathogen monitoring and race identification. These results indicate the increasing virulence and variability in the Kenyan P. graminis f. sp. tritici population and reveal vulnerabilities of elite germplasm to new races.
Publication - Specificity of a rust resistance suppressor on 7DL in the spring wheat cultivar Canthatch(American Phytopathological Society (APS), 2015) Talajoor, M.; Yue Jin; Anmin Wan; Xianming Chen; Bhavani, S.; Tabe, L.; Lagudah, E.; Li HuangThe spring wheat ‘Canthatch’ has been shown to suppress stem rust resistance genes in the background due to the presence of a suppressor gene located on the long arm of chromosome 7D. However, it is unclear whether the suppressor also suppresses resistance genes against leaf rust and stripe rust. In this study, we investigated the specificity of the resistance suppression. To determine whether the suppression is genome origin specific, chromosome location specific, or rust species or race specific, we introduced 11 known rust resistance genes into the Canthatch background, including resistance to leaf, stripe, or stem rusts, originating from A, B, or D genomes and located on different chromosome homologous groups. F1 plants of each cross were tested with the corresponding rust race, and the infection types were scored and compared with the parents. Our results show that the Canthatch 7DL suppressor only suppressed stem rust resistance genes derived from either the A or B genome, and the pattern of the suppression is gene specific and independent of chromosomal location.
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