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Wheat Stem rust or Leaf rust

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https://www.readbyqxmd.com/read/28559761/a-systematic-review-of-rye-secale-cereale-l-as-a-source-of-resistance-to-pathogens-and-pests-in-wheat-triticum-aestivum-l
#1
REVIEW
Leonardo A Crespo-Herrera, Larisa Garkava-Gustavsson, Inger Åhman
Wheat is globally one of the most important crops. With the current human population growth rate, there is an increasing need to raise wheat productivity by means of plant breeding, along with development of more efficient and sustainable agricultural systems. Damage by pathogens and pests, in combination with adverse climate effects, need to be counteracted by incorporating new germplasm that makes wheat more resistant/tolerant to such stress factors. Rye has been used as a source for improved resistance to pathogens and pests in wheat during more than 50 years...
2017: Hereditas
https://www.readbyqxmd.com/read/28555151/molecular-cytogenetic-characterization-of-two-triticum-secale-thinopyrum-trigeneric-hybrids-exhibiting-superior-resistance-to-fusarium-head-blight-leaf-rust-and-stem-rust-race-ug99
#2
Yi Dai, Yamei Duan, Huiping Liu, Dawn Chi, Wenguang Cao, Allen Xue, Yong Gao, George Fedak, Jianmin Chen
Fusarium head blight (FHB), leaf rust, and stem rust are the most destructive fungal diseases in current world wheat production. The diploid wheatgrass, Thinopyrum elongatum (Host) Dewey (2n = 2x = 14, EE) is an excellent source of disease resistance genes. Two new Triticum-Secale-Thinopyrum trigeneric hybrids were derived from a cross between a hexaploid triticale (X Triticosecale Wittmack, 2n = 6x = 42, AABBRR) and a hexaploid Triticum trititrigia (2n = 6x = 42, AABBEE), were produced and analyzed using genomic in situ hybridization and molecular markers...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28513283/molecular-characterisation-of-australian-isolates-of-puccinia-graminis-f-sp-tritici-supports-long-term-clonality-but-also-reveals-cryptic-genetic-variation
#3
Jianping Zhang, Peng Zhang, Haydar Karaoglu, Robert F Park
Long term surveys of pathogenicity in Puccinia graminis f. sp. tritici (Pgt) in Australia have implicated mutation as a major source of virulence, at times leading to the demise of stem rust resistant wheat cultivars and substantial yield losses. Since 1925, these surveys have identified at least four occasions on which exotic isolates of Pgt appeared in Australia, with each acting as a founding isolate that gave rise sequentially to derivative pathotypes via presumed single step mutation. The current study aimed to examine the relationship between virulence and molecular patterns using SSR markers on selected isolates of Pgt collected in Australia during a 52 year period in order to propose an evolutionary pathway...
May 17, 2017: Phytopathology
https://www.readbyqxmd.com/read/28443114/tadir1-2-a-wheat-ortholog-of-lipid-transfer-protein-atdir1-contributes-to-negative-regulation-of-wheat-resistance-against-puccinia-striiformis-f-sp-tritici
#4
Soyed M Ahmed, Peng Liu, Qinghe Xue, Changan Ji, Tuo Qi, Jia Guo, Jun Guo, Zhensheng Kang
Very few LTPs have been shown to act through plasma membrane receptors or to be involved in the hypersensitive response (HR). DIR1, a new type of plant LTP interacts with lipids in vitro, moves to distant tissues during systemic acquired resistance (SAR) and therefore is thought to be involved in long-distance signaling during SAR. However, the exact functions of DIR1 orthologs in cereal species under biotic and abiotic stresses have not been thoroughly defined. In this study, a novel wheat ortholog of the DIR1 gene, TaDIR1-2, was isolated from Suwon11, a Chinese cultivar of wheat and functionally characterized...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28398875/vulnerability-of-barley-to-african-pathotypes-of-puccinia-graminis-f-sp-tritici-and-sources-of-resistance
#5
B J Steffenson, A J Case, Z A Pretorius, V Coetzee, F J Kloppers, H Zhou, Y Chai, R Wanyera, G Macharia, S Bhavani, S Grando
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. The main objectives of this study were to assess the vulnerability of barley to pathotype TTKSK and identify possible sources of resistance...
May 12, 2017: Phytopathology
https://www.readbyqxmd.com/read/28393303/genomic-and-pedigree-based-prediction-for-leaf-stem-and-stripe-rust-resistance-in-wheat
#6
Philomin Juliana, Ravi P Singh, Pawan K Singh, Jose Crossa, Julio Huerta-Espino, Caixia Lan, Sridhar Bhavani, Jessica E Rutkoski, Jesse A Poland, Gary C Bergstrom, Mark E Sorrells
Genomic prediction for seedling and adult plant resistance to wheat rusts was compared to prediction using few markers as fixed effects in a least-squares approach and pedigree-based prediction. The unceasing plant-pathogen arms race and ephemeral nature of some rust resistance genes have been challenging for wheat (Triticum aestivum L.) breeding programs and farmers. Hence, it is important to devise strategies for effective evaluation and exploitation of quantitative rust resistance. One promising approach that could accelerate gain from selection for rust resistance is 'genomic selection' which utilizes dense genome-wide markers to estimate the breeding values (BVs) for quantitative traits...
July 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28381959/insights-into-tan-spot-and-stem-rust-resistance-and-susceptibility-by-studying-the-pre-green-revolution-global-collection-of-wheat
#7
Sidrat Abdullah, Sunish Kumar Sehgal, Yue Jin, Brent Turnipseed, Shaukat Ali
Tan spot (TS), caused by the fungus Pyrenophora tritici-repentis (Died) Drechs, is an important foliar disease of wheat and has become a threat to world wheat production since the 1970s. In this study a globally diverse pre-1940s collection of 247 wheat genotypes was evaluated against Ptr ToxA, P. tritici-repentis race 1, and stem rust to determine if; (i) acquisition of Ptr ToxA by the P. tritici-repentis from Stagonospora nodorum led to increased pathogen virulence or (ii) incorporation of TS susceptibility during development stem rust resistant cultivars led to an increase in TS epidemics globally...
April 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28286900/physical-mapping-of-dna-markers-linked-to-stem-rust-resistance-gene-sr47-in-durum-wheat
#8
Daryl L Klindworth, Jyoti Saini, Yunming Long, Matthew N Rouse, Justin D Faris, Yue Jin, Steven S Xu
Markers linked to stem rust resistance gene Sr47 were physically mapped in three small Aegilops speltoides chromosomal bins. Five markers, including two PCR-based SNP markers, were validated for marker-assisted selection. In durum wheat (Triticum turgidum subsp. durum), the gene Sr47 derived from Aegilops speltoides conditions resistance to race TTKSK (Ug99) of the stem rust pathogen (Puccinia graminis f. sp. tritici). Sr47 is carried on small interstitial translocation chromosomes (Ti2BL-2SL-2BL·2BS) in which the Ae...
June 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28275817/discovery-and-characterization-of-two-new-stem-rust-resistance-genes-in-aegilops-sharonensis
#9
Guotai Yu, Nicolas Champouret, Burkhard Steuernagel, Pablo D Olivera, Jamie Simmons, Cole Williams, Ryan Johnson, Matthew J Moscou, Inmaculada Hernández-Pinzón, Phon Green, Hanan Sela, Eitan Millet, Jonathan D G Jones, Eric R Ward, Brian J Steffenson, Brande B H Wulff
We identified two novel wheat stem rust resistance genes, Sr-1644-1Sh and Sr-1644-5Sh in Aegilops sharonensis that are effective against widely virulent African races of the wheat stem rust pathogen. Stem rust is one of the most important diseases of wheat in the world. When single stem rust resistance (Sr) genes are deployed in wheat, they are often rapidly overcome by the pathogen. To this end, we initiated a search for novel sources of resistance in diverse wheat relatives and identified the wild goatgrass species Aegilops sharonesis (Sharon goatgrass) as a rich reservoir of resistance to wheat stem rust...
June 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28255670/detection-and-validation-of-genomic-regions-associated-with-resistance-to-rust-diseases-in-a-worldwide-hexaploid-wheat-landrace-collection-using-bayesr-and-mixed-linear-model-approaches
#10
Raj K Pasam, Urmil Bansal, Hans D Daetwyler, Kerrie L Forrest, Debbie Wong, Joanna Petkowski, Nicholas Willey, Mandeep Randhawa, Mumta Chhetri, Hanif Miah, Josquin Tibbits, Harbans Bariana, Matthew J Hayden
BayesR and MLM association mapping approaches in common wheat landraces were used to identify genomic regions conferring resistance to Yr, Lr, and Sr diseases. Deployment of rust resistant cultivars is the most economically effective and environmentally friendly strategy to control rust diseases in wheat. However, the highly evolving nature of wheat rust pathogens demands continued identification, characterization, and transfer of new resistance alleles into new varieties to achieve durable rust control. In this study, we undertook genome-wide association studies (GWAS) using a mixed linear model (MLM) and the Bayesian multilocus method (BayesR) to identify QTL contributing to leaf rust (Lr), stem rust (Sr), and stripe rust (Yr) resistance...
April 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28241006/identification-and-validation-of-single-nucleotide-polymorphic-markers-linked-to-ug99-stem-rust-resistance-in-spring-wheat
#11
Long-Xi Yu, Shiaoman Chao, Ravi P Singh, Mark E Sorrells
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 durability. In the present study, we applied genome-wide association studies (GWAS) for identifying loci associated with the Ug99 stem rust resistance (SR) in a panel of wheat lines developed at the International Maize and Wheat Improvement Center (CIMMYT)...
2017: PloS One
https://www.readbyqxmd.com/read/28005310/the-lr34-adult-plant-rust-resistance-gene-provides-seedling-resistance-in-durum-wheat-without-senescence
#12
Amy Rinaldo, Brian Gilbert, Rainer Boni, Simon G Krattinger, Davinder Singh, Robert F Park, Evans Lagudah, Michael Ayliffe
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 only apparent in adult plants and not effective in field-grown seedlings. Lr34 also causes leaf tip necrosis (Ltn1) in mature adult plant leaves when grown under field conditions...
July 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27978816/genotype-by-sequencing-facilitates-genetic-mapping-of-a-stem-rust-resistance-locus-in-aegilops-umbellulata-a-wild-relative-of-cultivated-wheat
#13
Erena A Edae, Pablo D Olivera, Yue Jin, Jesse A Poland, Matthew N Rouse
BACKGROUND: Wild relatives of wheat play a significant role in wheat improvement as a source of genetic diversity. Stem rust disease of wheat causes significant yield losses at the global level and stem rust pathogen race TTKSK (Ug99) is virulent to most previously deployed resistance genes. Therefore, the objective of this study was to identify loci conferring resistance to stem rust pathogen races including Ug99 in an Aegilops umbelluata bi-parental mapping population using genotype-by-sequencing (GBS) SNP markers...
December 15, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27942031/evaluation-of-19-460-wheat-accessions-conserved-in-the-indian-national-genebank-to-identify-new-sources-of-resistance-to-rust-and-spot-blotch-diseases
#14
Sundeep Kumar, Sunil Archak, R K Tyagi, Jagdish Kumar, Vikas Vk, Sherry R Jacob, Kalyani Srinivasan, J Radhamani, R Parimalan, M Sivaswamy, Sandhya Tyagi, Mamata Yadav, Jyotisna Kumari, Deepali, Sandeep Sharma, Indoo Bhagat, Madhu Meeta, N S Bains, A K Chowdhury, B C Saha, P M Bhattacharya, Jyoti Kumari, M C Singh, O P Gangwar, P Prasad, S C Bharadwaj, Robin Gogoi, J B Sharma, Sandeep Kumar Gm, M S Saharan, Manas Bag, Anirban Roy, T V Prasad, R K Sharma, M Dutta, Indu Sharma, K C Bansal
A comprehensive germplasm evaluation study of wheat accessions conserved in the Indian National Genebank was conducted to identify sources of rust and spot blotch resistance. Genebank accessions comprising three species of wheat-Triticum aestivum, T. durum and T. dicoccum were screened sequentially at multiple disease hotspots, during the 2011-14 crop seasons, carrying only resistant accessions to the next step of evaluation. Wheat accessions which were found to be resistant in the field were then assayed for seedling resistance and profiled using molecular markers...
2016: PloS One
https://www.readbyqxmd.com/read/27927228/cellular-and-molecular-characterization-of-a-stem-rust-resistance-locus-on-wheat-chromosome-7al
#15
Vincent Pujol, Jose Robles, Penghao Wang, Jen Taylor, Peng Zhang, Li Huang, Linda Tabe, Evans Lagudah
BACKGROUND: Wheat stem rust, caused by Puccinia graminis f. sp. tritici, is a major wheat disease which is mainly controlled through the release of resistant cultivars containing one or several resistance genes. Considerable effort has been put into the discovery of new resistance genes, but knowledge of their mechanisms of action is often lacking. In this study, the mechanism of resistance conferred by a recently discovered stem rust resistance locus on wheat chromosome 7AL was investigated through microscopic observations and RNA-sequencing, using the susceptible line Columbus and the independent, backcrossed, resistant lines Columbus-NS765 and Columbus-NS766...
December 7, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27913833/tight-repulsion-linkage-between-sr36-and-sr39-was-revealed-by-genetic-cytogenetic-and-molecular-analyses
#16
Bosco Chemayek, Urmil K Bansal, Naeela Qureshi, Peng Zhang, William W Wagoire, Harbans S Bariana
The shortening of Aegilops speltoides segment did not facilitate recombination between stem rust resistance genes Sr36 and Sr39 . Robustness of marker rwgs28 for marker-assisted selection of Sr39 was demonstrated. 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 shortened Ae. speltoides segments, respectively, and the Sr36-carrying Australian wheat cultivar Cook were used in this study...
March 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/27792757/seedling-resistance-to-stem-rust-and-molecular-marker-analysis-of-resistance-genes-in-wheat-cultivars-of-yunnan-china
#17
Tian Ya Li, Yuan Yin Cao, Xian Xin Wu, Xiao Feng Xu, Wan Lin Wang
Stem rust is one of the most potentially harmful wheat diseases, but has been effectively controlled in China since 1970s. However, the interest in breeding wheat with durable resistance to stem rust has been renewed with the emergence of Ug99 (TTKSK) virulent to the widely used resistance gene Sr31, and by which the wheat stem rust was controlled for 40 years in wheat production area worldwide. Yunnan Province, located on the Southwest border of China, is one of the main wheat growing regions, playing a pivotal role in the wheat stem rust epidemic in China...
2016: PloS One
https://www.readbyqxmd.com/read/27791121/the-cc-domain-structure-from-the-wheat-stem-rust-resistance-protein-sr33-challenges-paradigms-for-dimerization-in-plant-nlr-proteins
#18
Lachlan W Casey, Peter Lavrencic, Adam R Bentham, Stella Cesari, Daniel J Ericsson, Tristan Croll, Dušan Turk, Peter A Anderson, Alan E Mark, Peter N Dodds, Mehdi Mobli, Bostjan Kobe, Simon J Williams
Plants use intracellular immunity receptors, known as nucleotide-binding oligomerization domain-like receptors (NLRs), to recognize specific pathogen effector proteins and induce immune responses. These proteins provide resistance to many of the world's most destructive plant pathogens, yet we have a limited understanding of the molecular mechanisms that lead to defense signaling. We examined the wheat NLR protein, Sr33, which is responsible for strain-specific resistance to the wheat stem rust pathogen, Puccinia graminis f...
October 17, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27775500/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
#19
E M Babiker, T C Gordon, S Chao, M N Rouse, R Wanyera, M Acevedo, G Brown-Guedira, J M Bonman
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 resistance to Ug99 in Kenya. The 90K wheat single nucleotide polymorphism (SNP) genotyping platform was used to genotype the parents and populations...
February 2017: Phytopathology
https://www.readbyqxmd.com/read/27705664/genetic-mapping-of-stem-rust-resistance-to-puccinia-graminis-f-sp-tritici-race-trttf-in-the-canadian-wheat-cultivar-harvest
#20
Colin W Hiebert, Matthew N Rouse, Jayaveeramuthu Nirmala, Tom Fetch
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 wheat cultivars, including the widely grown Canadian cultivar 'Harvest', are resistant to TRTTF. However, the genetic basis of resistance to TRTTF in Canadian and U...
February 2017: Phytopathology
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