Large-Scale Atmospheric Dispersal Simulations Identify Likely Airborne Incursion Routes of Wheat Stem Rust Into Ethiopia
In recent years, severe wheat stem rust epidemics hit Ethiopia, sub-Saharan Africa’s largest wheat-producing country. These were caused by race TKTTF (Digalu race) of the pathogen Puccinia graminis f. sp. tritici, which, in Ethiopia, was first detected at the beginning of August 2012. We use the incursion of this new pathogen race as a case study to determine likely airborne...
M. Meyer, L. Burgin, M. C. Hort, D. P. Hodson, and C. A. Gilligan
Phytopathology · Volume 107 · Issue 10 · 2017
Identification and validation of single nucleotide polymorphic markers linked to Ug99 stem rust resistance in spring wheat
Wheat stem rust (Puccinia graminis f. sp. tritici Eriks. and E. Henn.) is one of the most destructive diseases world-wide. Races belonging to Ug99 (or TTKSK) continue to cause crop losses in East Africa and threaten global wheat production. Developing and deploying wheat varieties with multiple race-specific genes or complex adult plant resistance is necessary to achieve...
Long-Xi Yu, Shiaoman Chao, Ravi P. Singh, Mark E. Sorrells
PLoS One · 2017
Identification and characterization of Sr13, a tetraploid wheat gene that confers resistance to the Ug99 stem rust race group
The Puccinia graminis f. sp. tritici (Pgt) Ug99 race group is virulent to most stem rust resistance genes currently deployed in wheat and poses a threat to global wheat production. The durum wheat (Triticum turgidum ssp. durum) gene Sr13 confers resistance to Ug99 and other virulent races, and is more effective at high temperatures. Using...
Wenjun Zhanga, Shisheng Chena, Zewdie Abate, Jayaveeramuthu Nirmala, Matthew N. Rouse, Jorge Dubcovsky
Proceedings of the National Academy of Sciences (US) · Volume 114 · Issue 45 · 2017
Speed breeding for multiple disease resistance in barley
To respond faster to the changing climate, evolving pathogens and to feed a global population of 9–10 billion by 2050, plant breeders are exploring more efficient crop improvement strategies. In this study, we applied novel methodology for rapid trait introgression to the European two-rowed barley cultivar Scarlett. Scarlett is widely-grown in Argentina and is preferred for malting and brewing...
Lee T. Hickey, Silvia E. Germán, Silvia A. Pereyra, Juan E. Diaz, Laura A. Ziems, Ryan A. Fowler, Greg J. Platz, Jerome D. Franckowiak, Mark J. Dieters
Euphytica · Volume 213 · Issue 64 · 2017
Mining Vavilov’s Treasure Chest of Wheat Diversity for Adult Plant Resistance to Puccinia triticina
Leaf rust (LR) caused by Puccinia triticina, is among the most important diseases of wheat (Triticum aestivum L.) crops globally. Deployment of cultivars incorporating genetic resistance, such as adult plant resistance (APR) or all-stage resistance, is considered the most sustainable control method. APR is preferred for durability because it places lower selection pressure on the...
Riaz, A.; Athiyannan, N.; Periyannan, S.; Afanasenko, O.; Mitrofanova, O.; Aitken, E. A. B.; Lagudah, E.; Hickey, L. T.
Plant Disease · Volume 101 · Issue 2 · 2017
Genetic mapping of stem rust resistance to Puccinia graminis f. sp. tritici race TRTTF in the Canadian wheat cultivar harvest
Stem rust, caused by Puccinia graminis f. sp. tritici, is a destructive disease of wheat that can be controlled by deploying effective stem rust resistance (Sr) genes. Highly virulent races of P. graminis f. sp. tritici in Africa have been detected and characterized. These include race TRTTF and the Ug99 group of races such as TTKSK. Several Canadian and U.S. spring...
Hiebert, C. W.; Rouse, M. N.; Jayaveeramuthu Nirmala; Fetch, T.
Phytopathology · Volume 107 · Issue 2 · 2017
Highly predictive SNP markers for efficient selection of the wheat leaf rust resistance gene Lr16
Lr16 is a widely deployed leaf rust resistance gene in wheat (Triticum aestivum L.) that is highly effective against the North American Puccinia triticina population when pyramided with the gene Lr34. Lr16 is a seedling leaf rust resistance gene...
Kassa, M. T.; You, F. M.; Hiebert, C. W.; Pozniak, C. J.; Fobert, P. R.; Sharpe, A. G.; Menzies, J. G.; Humphreys, D. G.; Harrison, N. R.; Fellers, J. P.; McCallum, B. D.; McCartney, C. A.
BMC Plant Biology · Volume 17 · Issue 45 · 2017
Farmers' perceptions on improved bread wheat varieties and formal seed supply in Ethiopia
The paper presents smallholder farmers' perceptions on attributes of bread wheat varieties based on primary data collected from 524 households in four major wheat growing areas of Ethiopia. The results indicated high value of attainment indices for improved varieties compared to landraces, which shows how the demanded attributes are embodied more in improved ones. Grain yield and yellow and...
Bishaw, Z.; Alemu, D.
International Journal of Plant Production · Volume 11 · Issue 1 · 2017
Adult plant resistance of selected Kenyan wheat cultivars to leaf rust and stem rust diseases
Phenotypic and genotypic evaluation of wheat genetic resources and development of segregating populations are pre-requisites for identifying rust resistance genes. The objectives of this study were to assess adult plant resistance (APR) of selected wheat genotypes to leaf rust and stem rust and to develop segregating populations for resistance breeding. Eight selected Kenyan cultivars with...
S. Figlan, T.A. Baloyi, T. Hlongoane, T.G. Terefe, H. Shimelis, T.J. Tsilo
Cereal Research Communications · Volume 45 · Issue 1 · 2017
Tight repulsion linkage between Sr36 and Sr39 was revealed by genetic, cytogenetic and molecular analyses
Stem rust resistance genes Sr39 and Sr36 were transferred from Aegilops speltoides and Triticum timopheevii, respectively, to chromosome 2B of wheat. Genetic stocks RL6082 and RWG1 carrying Sr39 on a large and a...
Bosco Chemaye, kUrmil K. Bansal, Naeela Qureshi, Peng Zhang, William W. Wagoire, Harbans S. Bariana
Theoretical and Applied Genetics · Volume 130 · Issue 3 · 2017