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      • Record: found
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      Association mapping of North American spring wheat breeding germplasm reveals loci conferring resistance to Ug99 and other African stem rust races.

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          Abstract

          The recently identified Puccinia graminis f. sp. tritici (Pgt) race TTKSK (Ug99) poses a severe threat to global wheat production because of its broad virulence on several widely deployed resistance genes. Additional virulences have been detected in the Ug99 group of races, and the spread of this race group has been documented across wheat growing regions in Africa, the Middle East (Yemen), and West Asia (Iran). Other broadly virulent Pgt races, such as TRTTF and TKTTF, present further difficulties in maintaining abundant genetic resistance for their effective use in wheat breeding against this destructive fungal disease of wheat. In an effort to identify loci conferring resistance to these races, a genome-wide association study was carried out on a panel of 250 spring wheat breeding lines from the International Maize and Wheat Improvement Center (CIMMYT), six wheat breeding programs in the United States and three wheat breeding programs in Canada.

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          Genetic dissection of complex traits

          E Lander, N Schork (1994)
          Article 0 comments Cited 268 times – based on 0 reviews     Review now
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            The emergence of Ug99 races of the stem rust fungus is a threat to world wheat production.

            Peter Njau, Sridhar Bhavani, M Govindan … (2010)
            Race Ug99 of the fungus Puccinia graminis tritici that causes stem or black rust disease on wheat was first detected in Uganda in 1998. Seven races belonging to the Ug99 lineage are now known and have spread to various wheat-growing countries in the eastern African highlands, as well as Zimbabwe, South Africa, Sudan, Yemen, and Iran. Because of the susceptibility of 90% of the wheat varieties grown worldwide, the Ug99 group of races was recognized as a major threat to wheat production and food security. Its spread, either wind-mediated or human-aided, to other countries in Africa, Asia, and beyond is evident. Screening in Kenya and Ethiopia has identified a low frequency of resistant wheat varieties and breeding materials. Identification and transfer of new sources of race-specific resistance from various wheat relatives is underway to enhance the diversity of resistance. Although new Ug99-resistant varieties that yield more than current popular varieties are being released and promoted, major efforts are required to displace current Ug99 susceptible varieties with varieties that have diverse race-specific or durable resistance and mitigate the Ug99 threat. Copyright © 2011 by Annual Reviews. All rights reserved.
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              Use of unlinked genetic markers to detect population stratification in association studies.

              J. Pritchard, N. Rosenberg (1999)
              We examine the issue of population stratification in association-mapping studies. In case-control studies of association, population subdivision or recent admixture of populations can lead to spurious associations between a phenotype and unlinked candidate loci. Using a model of sampling from a structured population, we show that if population stratification exists, it can be detected by use of unlinked marker loci. We show that the case-control-study design, using unrelated control individuals, is a valid approach for association mapping, provided that marker loci unlinked to the candidate locus are included in the study, to test for stratification. We suggest guidelines as to the number of unlinked marker loci to use.
              Article 0 comments Cited 168 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (iso-abbrev): BMC Plant Biol.
                Title: BMC plant biology
                Publisher: Springer Science and Business Media LLC
                ISSN (Electronic): 1471-2229
                ISSN (Print): 1471-2229
                Publication date (Electronic): Oct 14 2015
                Volume: 15
                Affiliations
                [1 ] Department of Agronomy, Purdue University, 915 West State Street, West Lafayette, IN, 47907, USA. bajga002@umn.edu.
                [2 ] Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA. bajga002@umn.edu.
                [3 ] United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Cereal Disease Laboratory, St. Paul, MN, 55108, USA. matthew.rouse@ars.usda.gov.
                [4 ] Department of Plant Pathology, University of Minnesota, St. Paul, MN, 55108, USA. matthew.rouse@ars.usda.gov.
                [5 ] Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA. peter.bulli@wsu.edu.
                [6 ] International Maize and Wheat Improvement Center (CIMMYT), ICRAF House, United Nations Avenue, Gigiri, Nairobi, Kenya. s.bhavani@cgiar.org.
                [7 ] United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Aberdeen, ID, 83210, USA. tyler.gordon@ars.usda.gov.
                [8 ] Kenya Agricultural and Livestock Research Organization (KALRO), Njoro, Kenya. wanyera@plantprotection.co.ke.
                [9 ] Kenya Agricultural and Livestock Research Organization (KALRO), Njoro, Kenya. njaupnn@yahoo.com.
                [10 ] Ethiopian Institute of Agricultural Research (EIAR), Pawe, Ethiopia. wasihunl@yahoo.com.
                [11 ] Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN, 55108, USA. ander319@umn.edu.
                [12 ] Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA. m.pumphrey@wsu.edu.
                Article
                Publisher Item ID: 10.1186/s12870-015-0628-9
                DOI: 10.1186/s12870-015-0628-9
                PMC ID: 4606553
                PubMed ID: 26467989
                SO-VID: 895fefbf-6e6d-4500-a3ba-07042e4a632c
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