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https://www.readbyqxmd.com/read/28211474/dissection-of-genomic-features-and-variations-of-three-pathotypes-of-puccinia-striiformis-through-whole-genome-sequencing
#1
Kanti Kiran, Hukam C Rawal, Himanshu Dubey, R Jaswal, Subhash C Bhardwaj, P Prasad, Dharam Pal, B N Devanna, Tilak R Sharma
Stripe rust of wheat, caused by Puccinia striiformis f. sp. tritici, is one of the important diseases of wheat. We used NGS technologies to generate a draft genome sequence of two highly virulent (46S 119 and 31) and a least virulent (K) pathotypes of P. striiformis from the Indian subcontinent. We generated ~24,000-32,000 sequence contigs (N50;7.4-9.2 kb), which accounted for ~86X-105X sequence depth coverage with an estimated genome size of these pathotypes ranging from 66.2-70.2 Mb. A genome-wide analysis revealed that pathotype 46S 119 might be highly evolved among the three pathotypes in terms of year of detection and prevalence...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202046/highly-predictive-snp-markers-for-efficient-selection-of-the-wheat-leaf-rust-resistance-gene-lr16
#2
Mulualem T Kassa, Frank M You, Colin W Hiebert, Curtis J Pozniak, Pierre R Fobert, Andrew G Sharpe, James G Menzies, D Gavin Humphreys, Nicole Rezac Harrison, John P Fellers, Brent D McCallum, Curt A McCartney
BACKGROUND: 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 conditioning an incompatible interaction with a distinct necrotic ring surrounding the uredinium. Lr16 was previously mapped to the telomeric region of the short arm of wheat chromosome 2B. The goals of this study were to develop numerous single nucleotide polymorphism (SNP) markers for the Lr16 region and identify diagnostic gene-specific SNP marker assays for marker-assisted selection (MAS)...
February 15, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28182966/characterization-of-a-small-gtp-binding-protein-gene-tarab18-from-wheat-involved-in-the-stripe-rust-resistance
#3
Zhengning Jiang, Hui Wang, Guoqin Zhang, Renhui Zhao, Tongde Bie, Ruiqi Zhang, Derong Gao, Liping Xing, Aizhong Cao
The stripe rust resistance gene, Yr26, is commonly used in wheat production. Identification of Yr26 resistance related genes is important for better understanding of the resistance mechanism. TaRab18, a putative small GTP-binding protein, was screened as a resistance regulated gene as it showed differential expression between the Yr26-containing resistant wheat and the susceptible wheat at different time points after Pst inoculation. TaRab18 contains four typical domains (GI to GIV) of the small GTP-binding proteins superfamily and five domains (RabF1 to RabF5) specific to the Rab subfamily...
January 30, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28177840/molecular-cytogenetics-identification-of-a-wheat-leymus-mollis-double-disomic-addition-line-with-stripe-rust-resistance
#4
Aicen Zhang, Wanyue Li, Changyou Wang, Xiaofei Yang, Chunhuan Chen, Chen Zhu, Nana Peng, Zengrong Tian, Yajuan Wang, Hong Zhang, Xinlun Liu, Wanquan Ji
Leymus mollis (Trin.) Pilger (2n = 4x = 28, NsNsXmXm) possesses a number of valuable genes against biotic and abiotic stress, which could be transferred into common wheat background for wheat improvement. In the present study, we determined the karyotypic constitution of a wheat-L. mollis double disomic addition line M11003-4-4-1-1 selected from the F5 progeny of a stable wheat-L. mollis derivative M39 (2n = 56) × Triticum aestivum cv. 7182, by morphological and cytogenetic identification, GISH (genomic in situ hybridization), FISH (fluorescent in situ hybridization), molecular markers analysis and stripe rust resistance evaluation...
November 23, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28177834/cytogenetic-study-and-stripe-rust-response-of-the-derivatives-from-a-wheat-thinopyrum-intermedium-psathyrostachys-huashanica-trigeneric-hybrid
#5
Kang Houyang, Lin Tang, Daiyan Li, Chengdou Diao, Wei Zhu, Yao Tang, Yi Wang, Xing Fan, Lili Xu, Jian Zeng, Sha Lina, Xiaofang Yu, Zhang Haiqin, Yong-Hong Zhou
In this work, the meiotic behavior, chromosome constitution, and stripe rust resistance of the F5 derivatives from wheat-Th. intermedium-P. huashanica trigeneric hybrid were studied. Cytological analysis indicated that the chromosome number of F5 progenies ranged from 42 to 50. The mean meiotic configuration of F5 lines was 1.28 univalents, 21.74 bivalents, 0.04 trivalents, and 0.02 tetravalents per pollen mother cell (PMC). Among the lines with 2n = 42, the average pairing configuration was 0.05 I + 19.91 II (ring) + 1...
December 10, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28176454/saturated-genic-snp-mapping-identified-functional-candidates-and-selection-tools-for-the-pinus-monticola-cr2-locus-controlling-resistance-to-white-pine-blister-rust
#6
Jun-Jun Liu, Richard A Sniezko, Arezoo Zamany, Holly Williams, Ning Wang, Angelia Kegley, Douglas P Savin, Hao Chen, Rona N Sturrock
Molecular breeding incorporates efficient tools to increase rust resistance in five-needle pines. Susceptibility of native five-needle pines to white pine blister rust (WPBR), caused by the non-native invasive fungus Cronartium ribicola (J.C.Fisch.), has significantly reduced wild populations of these conifers in North America. Major resistance (R) genes against specific avirulent pathotypes have been found in several five-needle pine species. In this study we screened genic SNP markers by comparative transcriptome and genetic association analyses and constructed saturated linkage maps for the western white pine (Pinus monticola) R locus (Cr2)...
February 7, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28160079/development-and-dissection-of-diagnostic-snp-markers-for-the-downy-mildew-resistance-genes-pl-arg-and-pl-8-and-maker-assisted-gene-pyramiding-in-sunflower-helianthus-annuus-l
#7
L L Qi, Z I Talukder, B S Hulke, M E Foley
Diagnostic DNA markers are an invaluable resource in breeding programs for successful introgression and pyramiding of disease resistance genes. Resistance to downy mildew (DM) disease in sunflower is mediated by Pl genes which are known to be effective against the causal fungus, Plasmopara halstedii. Two DM resistance genes, Pl Arg and Pl 8 , are highly effective against P. halstedii races in the USA, and have been previously mapped to the sunflower linkage groups (LGs) 1 and 13, respectively, using simple sequence repeat (SSR) markers...
February 3, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28095206/achieving-durable-resistance-against-plant-diseases-scenario-analysis-with-a-national-scale-spatially-explicit-model-for-a-wind-dispersed-plant-disease
#8
Marjolein Elisabeth Lof, Claude de Vallavieille-Pope, Wopke van der Werf
Genetic resistance in crops is a cornerstone of disease management in agriculture. Such genetic resistance is often rapidly broken due to selection for virulence in the pathogen population. Here we ask whether there are strategies that can prolong the useful life of plant resistance genes. In a modelling study, we compare four deployment strategies: gene pyramiding, sequential use, simultaneous use, and a mixed strategy. We developed a spatially explicit model for France and parameterized it for the fungal pathogen Puccinia striiformis f...
January 17, 2017: Phytopathology
https://www.readbyqxmd.com/read/28067016/how-glyphosate-affects-plant-disease-development-it-s-more-than-enhanced-susceptibility
#9
REVIEW
R Hammerschmidt
Glyphosate has been shown to affect the development of plant disease in several ways. Plants utilize phenolic and other shikimic acid pathway-derived compounds as part of their defense against pathogens, and glyphosate inhibits the biosynthesis of these compounds via its mode of action. Several studies have shown a correlation between enhanced disease and suppression of phenolic compound production after glyphosate. Glyphosate resistant crop plants have also been studied for changes in resistance as a result of carrying the glyphosate resistance trait...
January 9, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28039516/defeating-the-warrior-genetic-architecture-of-triticale-resistance-against-a-novel-aggressive-yellow-rust-race
#10
Dominik Losert, Hans Peter Maurer, Willmar L Leiser, Tobias Würschum
Genome-wide association mapping of resistance against the novel, aggressive 'Warrior' race of yellow rust in triticale revealed a genetic architecture with some medium-effect QTL and a quantitative component, which in combination confer high levels of resistance on both leaves and ears. Yellow rust is an important destructive fungal disease in small grain cereals and the exotic 'Warrior' race has recently conquered Europe. The aim of this study was to investigate the genetic architecture of yellow rust resistance in hexaploid winter triticale as the basis for a successful resistance breeding...
December 30, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28039515/genome-wide-association-mapping-for-seedling-and-field-resistance-to-puccinia-striiformis-f-sp-tritici-in-elite-durum-wheat
#11
Weizhen Liu, Marco Maccaferri, Peter Bulli, Sheri Rynearson, Roberto Tuberosa, Xianming Chen, Michael Pumphrey
Genome-wide association analysis in tetraploid wheat revealed novel and diverse loci for seedling and field resistance to stripe rust in elite spring durum wheat accessions from worldwide. Improving resistance to stripe rust, caused by Puccinia striiformis f. sp. tritici, is a major objective for wheat breeding. To identify effective stripe rust resistance loci, a genome-wide association study (GWAS) was conducted using 232 elite durum wheat (Triticum turgidum ssp. durum) lines from worldwide breeding programs...
December 30, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28034841/transcription-factor-gene-tugt%C3%AE-3-is-involved-in-the-stripe-rust-resistance-in-triticum-urartu
#12
Ding Liujun, Pu Mingyu, Wei Bo, Wang Xianping, Fan Renchun, Zhang Xiangqi
Wheat stripe rust, caused by Puccinia striiformis West. f. sp. tritici Eriks. &Henn. (Pst), is a serious fungal disease. Identification of new genes associate with stripe rust resistance is important for developing disease resistant wheat cultivars and studying the mechanism of disease resistance. Trihelix is a plant specific transcription factor family, which is involved in regulation of growth and development, morphogenesis, and response to stresses. So far, no study reports on the relationship between the Trihelix family and wheat stripe rust...
December 20, 2016: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/28031244/fine-mapping-of-ur-3-a-historically-important-rust-resistance-locus-in-common-bean
#13
Oscar P Hurtado-Gonzales, Giseli Valentini, Thiago A S Gilio, Alexandre M Martins, Qijian Song, Marcial A Pastor-Corrales
Bean rust, caused by Uromyces appendiculatus, is a devastating disease of common bean (Phaseolus vulgaris) in the Americas and Africa. The historically important Ur-3 gene confers resistance to many races of the highly variable bean rust pathogen that overcome other rust resistance genes. Existing molecular markers tagging Ur-3 for use in marker assisted selection produce false results. We describe here the fine mapping of the Ur-3 locus for the development of highly accurate markers linked to Ur-3 An F2 population from the cross Pinto 114 (susceptible) × Aurora (resistant with Ur-3) was evaluated for its reaction to four different races of U...
December 27, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28028892/qtl-seq-approach-identified-genomic-regions-and-diagnostic-markers-for-rust-and-late-leaf-spot-resistance-in-groundnut-arachis-hypogaea-l
#14
Manish K Pandey, Aamir W Khan, Vikas K Singh, Manish K Vishwakarma, Yaduru Shasidhar, Vinay Kumar, Vanika Garg, Ramesh S Bhat, Annapurna Chitikineni, Pasupuleti Janila, Baozhu Guo, Rajeev K Varshney
Rust and late leaf spot (LLS) are the two major foliar fungal diseases in groundnut, and their co-occurrence leads to significant yield loss in addition to the deterioration of fodder quality. To identify candidate genomic regions controlling resistance to rust and LLS, whole genome re-sequencing (WGRS) based approach referred as 'QTL-seq' was deployed. A total of 231.67 Gb raw and 192.10 Gb of clean sequence data were generated through WGRS of resistant parent, and the resistant and susceptible bulks for rust and LLS...
December 27, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28012228/the-escalatory-red-queen-population-extinction-and-replacement-following-arms-race-dynamics-in-poplar-rust
#15
A Persoons, K J Hayden, B Fabre, P Frey, S De Mita, A Tellier, F Halkett
Host-parasite systems provide convincing examples of Red Queen co-evolutionary dynamics. Yet, a key process underscored in Van Valen's theory - that arms-race dynamics can result in extinction - has never been documented. One reason for this may be that most sampling designs lack the breadth needed to illuminate the rapid pace of adaptation by pathogen populations. In this study we used a 25-years temporal sampling to decipher the demographic history of a plant pathogen: the poplar rust fungus, Melampsora larici-populina...
December 24, 2016: Molecular Ecology
https://www.readbyqxmd.com/read/28005310/the-lr34-adult-plant-rust-resistance-gene-provides-seedling-resistance-in-durum-wheat-without-senescence
#16
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...
December 22, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28004134/genetic-analysis-and-mapping-of-adult-plant-resistance-loci-to-leaf-rust-in-durum-wheat-cultivar-bairds
#17
Caixia Lan, Bhoja R Basnet, Ravi P Singh, Julio Huerta-Espino, Sybil A Herrera-Foessel, Yong Ren, Mandeep S Randhawa
New leaf rust adult plant resistance (APR) QTL QLr.cim - 6BL was mapped and confirmed the known pleotropic APR gene Lr46 effect on leaf rust in durum wheat line Bairds. CIMMYT-derived durum wheat line Bairds displays an adequate level of adult plant resistance (APR) to leaf rust in Mexican field environments. A recombinant inbred line (RIL) population developed from a cross of Bairds with susceptible parent Atred#1 was phenotyped for leaf rust response at Ciudad Obregon, Mexico, during 2013, 2014, 2015 and 2016 under artificially created epidemics of Puccinia triticina (Pt) race BBG/BP...
December 21, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28002449/identification-of-a-differentially-expressed-tir-nbs-lrr-gene-in-a-major-qtl-associated-to-leaf-rust-resistance-in-salix
#18
Tom Martin, Ann-Christin Rönnberg-Wästljung, Jan Stenlid, Berit Samils
An earlier identified major quantitative trait locus for resistance towards the willow leaf rust fungus Melampsora larici-epitea in a Salix viminalis x (S. viminalis × S. schwerinii) population was used to identify potential resistance genes to the rust pathogen. Screening a genomic bacterial artificial chromosome library with markers from the peak position of the QTL region revealed one gene with TIR-NBS-LRR (Toll Interleukin1 Receptor-Nucleotide Binding Site-Leucine-Rich Repeat) domain structure indicative of a resistance gene...
2016: PloS One
https://www.readbyqxmd.com/read/27995685/taadf4-an-actin-depolymerizing-factor-from-wheat-is-required-for-resistance-to-the-stripe-rust-pathogen-puccinia-striiformis-f-sp-tritici
#19
Bing Zhang, Yuan Hua, Juan Wang, Yan Huo, Masaki Shimono, Brad Day, Qing Ma
Actin filament assembly in plants is a dynamic process, requiring the activity of more than 75 actin-binding proteins. Central to the regulation of filament assembly and stability is the activity of a conserved family of actin-depolymerizing factors (ADFs), whose primarily function is to regulate actin filament severing and depolymerization. In recent years, the activity of ADF proteins has been linked to a variety of cellular processes, including those associated with response to stress. Herein, a wheat ADF gene, TaADF4, was identified and characterized...
December 20, 2016: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/27994192/mapping-of-stripe-rust-resistance-gene-in-an-aegilops-caudate-introgression-line-in-wheat-and-its-genetic-association-with-leaf-rust-resistance
#20
Puneet Inder Toor, Satinder Kaur, Mitaly Bansal, Bharat Yadav, Parveen Chhuneja
A pair of stripe rust and leaf rust resistance genes was introgressed from Aegilops caudata, a nonprogenitor diploid species with the CC genome, to cultivated wheat. Inheritance and genetic mapping of stripe rust resistance gene in backcrossrecombinant inbred line (BC-RIL) population derived from the cross of a wheat-Ae. caudata introgression line (IL) T291- 2(pau16060) with wheat cv. PBW343 is reported here. Segregation of BC-RILs for stripe rust resistance depicted a single major gene conditioning adult plant resistance (APR) with stripe rust reaction varying from TR-20MS in resistant RILs signifying the presence of some minor genes as well...
December 2016: Journal of Genetics
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