Vulnerability of Barley to African Pathotypes of Puccinia graminis f.sp.tritici and Sources of Resistance
The emergence of widely virulent pathotypes (e.g., TTKSK in the Ug99 race group) of the stem rust pathogen (Puccinia graminis f.sp. tritici) in Africa threatens wheat production on a global scale. Although intensive research efforts have been advanced to address this threat in wheat, few studies have been conducted on barley, even though pathotypes such as TTKSK are known to attack the crop....
B. J. Steffenson, A. J. Case, Z. A. Pretorius, V. Coetzee, F. J. Kloppers, H. Zhou, Y. Chai, R. Wanyera, G. Macharia, S. Bhavani, and S. Grando
Phytopathology · Volume 107 · Issue 8 · 2017
Genetic analysis of resistance to stripe rust in some Iranian bread wheat cultivars and elite lines
Stripe rust is the most important disease of wheat in many wheat growing areas in Iran. Good knowledge of the genetic basis of resistance to stripe rust in commercial bread wheat cultivars and selected elite lines is an important objective in wheat breeding programs. This study aimed to identify resistance genes and modes of inheritance of stripe rust resistance in recently released Iranian...
A. Zakeri, F. Afshari, M. Yasaie, A. R. Nikzad, S. Rajaei
Crop Breeding Journal · 2017
First Report of Virulence to Sr25 in Race TKTTF of Puccinia graminis f. sp. tritici Causing Stem Rust on Wheat
Puccinia graminis f. sp. tritici (Pgt) race TKTTF was reported as the dominant race in the wheat stem rust epidemics in Ethiopia during 2014–15 (Olivera et al. 2015). The race and variants hereof have also been recorded elsewhere in Africa, the Middle East, and Europe (...
M. Patpour, M. S. Hovmøller, D. Hodson
Plant Disease · Volume 101 · Issue 9 · 2017
First Detection of Virulence in Puccinia striiformis f. sp. tritici to Wheat Resistance Genes Yr10 and Yr24 (=Yr26) in Mexico
Stripe rust, caused by Puccinia striiformis f. sp. tritici, was observed on bread wheat (Triticum aestivum L.) lines previously considered to be resistant. Specifically, near isogenic lines (NIL) carrying the resistance genes Yr10, Yr24, and Yr26 at the CIMMYT-Toluca research station were observed to be infected with stripe rust in 2015. Several leaves...
J. Huerta-Espino, R. P. Singh
Plant Disease · Volume 101 · Issue 9 · 2017
The Lr34 adult plant rust resistance gene provides seedling resistance in durum wheat without senescence
The hexaploid wheat (Triticum aestivum) adult plant resistance gene, Lr34/Yr18/Sr57/Pm38/Ltn1, provides broad-spectrum resistance to wheat leaf rust (Lr34), stripe rust (Yr18), stem rust (Sr57) and powdery mildew (Pm38) pathogens, and has remained effective in wheat crops for many decades. The partial resistance provided by this gene is...
Amy Rinaldo, Brian Gilbert, Rainer Boni, Simon G. Krattinger, Davinder Singh, Robert F. Park, Evans Lagudah, Michael Ayliffe
Plant Biotechnology Journal · Volume 15 · Issue 7 · 2017
Molecular Mapping of Stem Rust Resistance Loci Effective Against the Ug99 Race Group of the Stem Rust Pathogen and Validation of a Single Nucleotide Polymorphism Marker Linked to Stem Rust Resistance Gene Sr28
Wheat landrace PI 177906 has seedling resistance to stem rust caused by Puccinia graminis f. sp. tritici races TTKSK, TTKST, and BCCBC and field resistance to the Ug99 race group. Parents, 140 recombinant inbred lines, and 138 double haploid (DH) lines were evaluated for seedling resistance to races TTKSK and BCCBC. Parents and the DH population were evaluated for field...
E. M. Babiker, T. C. Gordon, S. Chao, M. N. Rouse, R. Wanyera, M. Acevedo, G. Brown-Guedira, and J. M. Bonman
Phytopathology · Volume 107 · Issue 2 · 2017
Genetic yield gains in CIMMYT's international Elite Spring Wheat Yield Trials by modeling the genotype * environment interaction
We calculated the annual genetic gains for grain yield (GY) of wheat (Triticum aestivum L.) achieved over 8 yr of international Elite Spring Wheat Yield Trials (ESWYT), from 2006–2007 (27th ESWYT) to 2014–2015 (34th ESWYT). In total, 426 locations were classified within three main megaenvironments (MEs): ME1 (optimally irrigated environments), ME4 (drought-stressed environments), and...
Leonardo A. Crespo-Herrera, Jose Crossa, Julio Huerta-Espino, Enrique Autrique, Suchismita Mondal, Govindan Velu, Mateo Vargas, Hans J. Braun, Ravi P. Singh
Crop Science · Volume 57 · Issue 2 · 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 Zhang, Shisheng Chen, Zewdie Abate, Jayaveeramuthu Nirmala, Matthew N. Rouse, Jorge Dubcovsky
Proceedings of the National Academy of Sciences (US) · 2017
Comparative Analysis Highlights Variable Genome Content of Wheat Rusts and Divergence of the Mating Loci
Three members of the Puccinia genus, P. triticina (Pt), P. striiformis f.sp. tritici (Pst), and P. graminis f.sp. tritici (Pgt), cause the most common and often most significant foliar diseases of wheat. While similar in biology and life cycle, each species is uniquely adapted and specialized. The genomes of ...
Christina A. Cuomo, Guus Bakkeren, Hala Badr Khalil, Vinay Panwar, David Joly, Rob Linning, Sharadha Sakthikumar, Xiao Song, Xian Adiconis, Lin Fan, Jonathan M. Goldberg, Joshua Z. Levin, Sarah Young, Qiandong Zeng, Yehoshua Anikster, Myron Bruce, Meinan Wang, Chuntao Yin, Brent McCallum, Les J. Szabo, Scot Hulbert, Xiaming Chen, John P. Fellers
G3 · Volume 7 · Issue 2 · 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