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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Association mapping reveals novel stem rust resistance loci in durum wheat at the seedling stage
Plant Genome, Volume 7, No. 1, Year 2014
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Description
Wheat stem rust rapidly evolves new virulence to resistance genes. Recently emerged races in East Africa, such as TTKSK (or Ug99), possess broad virulence to durum cultivars, and only a limited number of genes provide resistance. An association mapping (AM) study conducted on 183 durum wheat accessions has allowed us to identify 41 quantitative trait loci (QTLs; determination coefficient [R2] values from 1.1 to 23.1%) for seedling resistance to one or more of four highly virulent stem rust races: TRTTF, TTTTF, TTKSK (Ug99), and JRCQC, two of which (TRTTF and JRCQC) were isolated from Ethiopia. Among these loci, 24 are novel, while the remaining 17 overlapped with loci previously shown to provide field resistance in Ethiopia and/or chromosome regions known to harbor designated stem rust resistance designated loci (Sr). The identified loci were either effective against multiple races or race specific, particularly for race JRCQC. Our results highlight that stem rust resistance in durum wheat is governed in part by loci for resistance across multiple races, and in part by race-specific ones (23 and 18, respectively). Collectively, these results provide useful information to improve the effectiveness of marker-assisted selection towards the release of durum wheat cultivars with durable stem rust resistance. © Crop Science Society of America.
Authors & Co-Authors
Letta, Tesfaye
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Ethiopia, Bale Robe
Sinana Agricultural Research Center
Olivera, Pablo D.
United States, Saint Paul
Usda Agricultural Research Service, Cereal Disease Laboratory
Maccaferri, Marco
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Jin, Yue
United States, Saint Paul
Usda Agricultural Research Service, Cereal Disease Laboratory
Ammar, Karim
Mexico, Texcoco
Centro Internacional de Mejoramiento de Maiz y Trigo
Badebo, Ayele
Ethiopia, Addis Ababa
Debre Zeit Agricultural Research Center
Salvi, Silvio
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Noli, Enrico
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Crossa, José Luis
Mexico, Texcoco
Centro Internacional de Mejoramiento de Maiz y Trigo
Tuberosa, Roberto
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Statistics
Citations: 50
Authors: 10
Affiliations: 5
Identifiers
Doi:
10.3835/plantgenome2013.08.0026
e-ISSN:
19403372
Study Approach
Quantitative
Study Locations
Multi-countries
Ethiopia