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Molecular mapping of.YrTZ2,a stripe rust resistance gene in wild emmer accession TZ-2 and its comparative analyses with Aegilops tauschii

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Journal of.Integrative Agriculture 2018年第6期17卷 1267-1275页

作者： WANG Zhen-zhong XIE Jing-zhong GUO Li ZHANG De-yun LI Gen-qiao f.NG Ti-lin CHEN Yong-xing LI Jun WU Qiu-hong LU Ping LI Miao-miao WU Hai-bin ZHANG Huai-zhi ZHANG Yan YANG Wu-yun LUO Ming-cheng f.hima Tzion LIU Zhi-yong China Rural Technology Development Center Beijing 100045P.R.China Institute of.Genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101P.R.China College of.Agronomy and Biotechnology China Agricultural UniversityBeijing 100193P.R.China Department of.Plant and Soil Sciences Oklahoma State UniversityStillwaterOK 74078USA Crop Research Institute Sichuan Academy of Agriculture SciencesChengdu 610066P.R.China China National Seed Group Co. Ltd.Beijing 100045P.R.China Department of.Plant Sciences University of CaliforniaDavisCA 95616USA Institute of.Evolution University of HaifaMount CarmelHaifa 31905Israel

Wheat stripe rust, caused by puccinia striif.rmis f. sp. tritici （Pst）, is a devastating disease that can cause severe yield losses. Identif.cation and utilization of.stripe rust resistance genes are essential f.r ef.ective breeding against the disease. Wild emmer accession TZ-2, originally collected f.om Mount Hermon, Israel, conf.rs near-immunity resistance against several prevailing Pst races in China. A set of.200 f.：7 recombinant inbred lines （RILs） derived f.om a cross between susceptible durum wheat cultivar Langdon and TZ-2 was used f.r stripe rust evaluation. Genetic analysis indicated that the stripe rust resistance of.TZ-2 to Pst race CYR34 was controlled by a single dominant gene, temporarily designated YrTZ2. Through bulked segregant analysis （BSA） with SSR markers, YrTZ2 was located on chromosome arm 1BS f.anked by Xwmc230 and Xgwm413 with genetic distance of.0.8 cM （distal） and 0.3 cM （proximal）, resp.ctively. By applying wheat 90K iSelect SNP genotyping assay, 11 polymorphic loci （consisting of.250 SNP markers） closely linked to YrTZ2 were identif.ed. YrTZ2 was f.rther delimited into a 0.8-cM genetic interval between SNP marker IWB19368 and SSR marker Xgwm413, and cosegregated with SNP marker IWB28744 （co-segregated with 28 SNP）. Comparative genomics analyses revealed high level of.collinearity between the YrTZ2 genomic region and the orthologous region of.Aegilops tauschii 1DS. The genomic region between loci IWB19368 and IWB31649 harboring YrTZ2 is orthologous to a 24.5-Mb genomic region between AT1D0112 and AT1D0150, sp.nning 15 contigs on chromosome 1DS. The genetic and comparative maps of.YrTZ2 rovide a f.amework f.r map-based cloning and marker-assisted selection of.YrTZ2.

关键词： Triticum dicoccoides puccinia striformis f. sp. tritici SNP comparative genomics

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