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https://www.readbyqxmd.com/read/27918080/the-hemileia-vastatrix-effector-hvec-016-suppresses-bacterial-blight-symptoms-in-coffee-genotypes-with-the-sh-1-rust-resistance-gene
#1
Thiago Maia, Jorge L Badel, Gustavo Marin-Ramirez, Cynthia de M Rocha, Michelle B Fernandes, José C F da Silva, Gilson M de Azevedo-Junior, Sérgio H Brommonschenkel
A number of genes that confer resistance to coffee leaf rust (SH 1-SH 9) have been identified within the genus Coffea, but despite many years of research on this pathosystem, the complementary avirulence genes of Hemileia vastatrix have not been reported. After identification of H. vastatrix effector candidate genes (HvECs) expressed at different stages of its lifecycle, we established an assay to characterize HvEC proteins by delivering them into coffee cells via the type-three secretion system (T3SS) of Pseudomonas syringae pv...
December 5, 2016: New Phytologist
https://www.readbyqxmd.com/read/27917192/mining-centuries-old-in-situ-conserved-turkish-wheat-landraces-for-grain-yield-and-stripe-rust-resistance-genes
#2
Deepmala Sehgal, Susanne Dreisigacker, Savaş Belen, Ümran Küçüközdemir, Zafer Mert, Emel Özer, Alexey Morgounov
Wheat landraces in Turkey are an important genetic resource for wheat improvement. An exhaustive 5-year (2009-2014) effort made by the International Winter Wheat Improvement Programme (IWWIP), a cooperative program between the Ministry of Food, Agriculture and Livestock of Turkey, the International Center for Maize and Wheat Improvement (CIMMYT) and the International Center for Agricultural Research in the Dry Areas (ICARDA), led to the collection and documentation of around 2000 landrace populations from 55 provinces throughout Turkey...
2016: Frontiers in Genetics
https://www.readbyqxmd.com/read/27913833/tight-repulsion-linkage-between-sr36-and-sr39-was-revealed-by-genetic-cytogenetic-and-molecular-analyses
#3
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...
December 2, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/27902805/genome-wide-association-mapping-reveals-novel-qtl-for-seedling-leaf-rust-resistance-in-a-worldwide-collection-of-winter-wheat
#4
Genqiao Li, Xiangyang Xu, Guihua Bai, Brett F Carver, Robert Hunger, J Michael Bonman, James Kolmer, Hongxu Dong
Leaf rust of wheat ( L.) is a major disease that causes significant yield losses worldwide. The short-lived nature of leaf rust resistance () genes necessitates a continuous search for novel sources of resistance. We performed a genome-wide association study (GWAS) on a panel of 1596 wheat accessions. The panel was evaluated for leaf rust reaction by testing with a bulk of Eriks. () isolates collected from multiple fields of Oklahoma in 2013 and two predominant races in the fields of Oklahoma in 2015. The panel was genotyped with a set of 5011 single-nucleotide polymorphism (SNP) markers...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27902791/genome-wide-association-mapping-of-leaf-rust-response-in-a-durum-wheat-worldwide-germplasm-collection
#5
Meriem Aoun, Matthew Breiland, M Kathryn Turner, Alexander Loladze, Shiaoman Chao, Steven S Xu, Karim Ammar, James A Anderson, James A Kolmer, Maricelis Acevedo
Leaf rust (caused by Erikss. []) is increasingly impacting durum wheat ( L. var. ) production with the recent appearance of races with virulence to widely grown cultivars in many durum producing areas worldwide. A highly virulent race on durum wheat was recently detected in Kansas. This race may spread to the northern Great Plains, where most of the US durum wheat is produced. The objective of this study was to identify sources of resistance to several races from the United States and Mexico at seedling stage in the greenhouse and at adult stage in field experiments...
November 2016: Plant Genome
https://www.readbyqxmd.com/read/27901296/novel-forest-decline-triggered-by-multiple-interactions-among-climate-an-introduced-pathogen-and-bark-beetles
#6
Carmen M Wong, Lori D Daniels
Novel forest decline is increasing due to global environmental change, yet the causal factors and their interactions remain poorly understood. Using tree ring analyses, we show how climate and multiple biotic factors caused the decline of whitebark pine (Pinus albicaulis) in 16 stands in the southern Canadian Rockies. In our study area, 72% of whitebark pines were dead and 18% had partially dead crowns. Tree mortality peaked in the 1970s; however, the annual basal area increment of disturbed trees began to decline significantly in the late 1940s...
November 5, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27898286/a-conserved-puccinia-striiformis-protein-interacts-with-wheat-npr1-and-reduces-induction-of-pathogenesis-related-genes-in-response-to-pathogens
#7
Xiaodong Wang, Baoju Yang, Kun Li, Zhensheng Kang, Dario Cantu, Jorge Dubcovsky
In Arabidopsis, NPR1 is a key transcriptional co-regulator of systemic acquired resistance. Upon pathogen challenge, NPR1 translocates from the cytoplasm to the nucleus, where it interacts with TGA-bZIP transcription factors to activate the expression of several Pathogenesis-Related (PR) genes. In a screen of a yeast two-hybrid library from wheat leaves infected with Puccinia striiformis f. sp. tritici, we identified a conserved rust protein that interacts with wheat NPR1 and named it Puccinia NPR1 interactor (PNPi)...
November 29, 2016: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/27885775/the-coffee-leaf-rust-pathogen-hemileia-vastatrix-one-and-a-half-centuries-around-the-tropics
#8
Pedro Talhinhas, Dora Batista, Inês Diniz, Ana Vieira, Diogo N Silva, Andreia Loureiro, Sílvia Tavares, Ana Paula Pereira, Helena G Azinheira, Leonor Guerra-Guimarães, Vítor Várzea, Maria do Céu Silva
Taxonomy and history: Hemileia vastatrix Berk. and Broome (Basidiomycota, Pucciniales) was described in 1869 in Eastern Africa and Ceylon as the agent of Coffee Leaf Rust and spread to all coffee cultivation areas worldwide. Major disease outbreaks in Asia, Africa and America caused and continue to cause severe yield losses, making this the most important disease of Arabica coffee, a cash crop for many tropical and sub-tropical countries. Life cycle and disease symptoms: Hemileia vastatrix is a hemicyclic fungus with the urediniosporic life cycle as its most important (if not only) source of inoculum...
November 25, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27881987/microscopic-and-molecular-characterization-of-the-prehaustorial-resistance-against-wheat-leaf-rust-puccinia-triticina-in-einkorn-triticum-monococcum
#9
Albrecht Serfling, Sven E Templer, Peter Winter, Frank Ordon
Puccinia triticina f. sp. tritici (Eriks.), the causal agent of leaf rust, causes substantial yield losses in wheat production. In wheat many major leaf rust resistance genes have been overcome by virulent races. In contrast, the prehaustorial resistance (phr) against wheat leaf rust detected in the diploid wheat Einkorn (Triticum monoccocum var. monococcum) accession PI272560 confers race-independent resistance against isolates virulent on accessions harboring resistance genes located on the A-genome of Triticum aestivum...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27877188/identification-of-genomic-associations-for-adult-plant-resistance-in-the-background-of-popular-south-asian-wheat-cultivar-pbw343
#10
Huihui Li, Sukhwinder Singh, Sridhar Bhavani, Ravi P Singh, Deepmala Sehgal, Bhoja R Basnet, Prashant Vikram, Juan Burgueno-Ferreira, Julio Huerta-Espino
Rusts, a fungal disease as old as its host plant wheat, has caused havoc for over 8000 years. As the rust pathogens can evolve into new virulent races which quickly defeat the resistance that primarily rely on race specificity, adult plant resistance (APR) has often been found to be race non-specific and hence is considered to be a more reliable and durable strategy to combat this malady. Over decades sets of donor lines have been identified at International Maize and Wheat Improvement Center (CIMMYT) representing a wide range of APR sources in wheat...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27871149/pstha5a23-a-candidate-effector-from-the-obligate-biotrophic-pathogen-puccinia-striiformis-f-sp-tritici-is-involved-in-plant-defense-suppression-and-rust-pathogenicity
#11
Yulin Cheng, Kuan Wu, Juanni Yao, Shumin Li, Xiaojie Wang, Lili Huang, Zhensheng Kang
During the infection of host plants, pathogens can deliver virulence-associated "effector" proteins to promote plant susceptibility. However, little is known about effector function in the obligate biotrophic pathogen Puccinia striiformis f. sp. tritici (Pst) that is an important fungal pathogen in wheat production worldwide. Here, we report our findings on an in planta highly induced candidate effector from Pst, PSTha5a23. The PSTha5a23 gene is unique to Pst and shows a low level of intra-species polymorphism...
November 21, 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27866228/fine-mapping-of-the-chromosome-5b-region-carrying-closely-linked-rust-resistance-genes-yr47-and-lr52-in-wheat
#12
Naeela Qureshi, Harbans Bariana, Kerrie Forrest, Matthew Hayden, Beat Keller, Thomas Wicker, Justin Faris, Elena Salina, Urmil Bansal
Fine mapping of Yr47 and Lr52 in chromosome arm 5BS of wheat identified close linkage of the marker sun180 to both genes and its robustness for marker-assisted selection was demonstrated. The widely effective and genetically linked rust resistance genes Yr47 and Lr52 have previously been mapped in the short arm of chromosome 5B in two F3 populations (Aus28183/Aus27229 and Aus28187/Aus27229). The Aus28183/Aus27229 F3 population was advanced to generate an F6 recombinant inbred line (RIL) population to identify markers closely linked with Yr47 and Lr52...
November 19, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/27824906/chromosomal-localization-of-genes-conferring-desirable-agronomic-traits-from-wheat-agropyron-cristatum-disomic-addition-line-5113
#13
Qingfeng Li, Yuqing Lu, Cuili Pan, Miaomiao Yao, Jinpeng Zhang, Xinming Yang, Weihua Liu, Xiuquan Li, Yajun Xi, Lihui Li
Creation of wheat-alien disomic addition lines and localization of desirable genes on alien chromosomes are important for utilization of these genes in genetic improvement of common wheat. In this study, wheat-Agropyron cristatum derivative line 5113 was characterized by genomic in situ hybridization (GISH) and specific-locus amplified fragment sequencing (SLAF-seq), and was demonstrated to be a novel wheat-A. cristatum disomic 6P addition line. Compared with its parent Fukuhokomugi (Fukuho), 5113 displayed multiple elite agronomic traits, including higher uppermost internode/plant height ratio, larger flag leaf, longer spike length, elevated grain number per spike and spikelet number per spike, more kernel number in the middle spikelet, more fertile tiller number per plant, and enhanced resistance to powdery mildew and leaf rust...
2016: PloS One
https://www.readbyqxmd.com/read/27821048/identification-characterization-and-gene-expression-analysis-of-nucleotide-binding-site-nb-type-resistance-gene-homologues-in-switchgrass
#14
Taylor P Frazier, Nathan A Palmer, Fuliang Xie, Christian M Tobias, Teresa J Donze-Reiner, Aureliano Bombarely, Kevin L Childs, Shengqiang Shu, Jerry W Jenkins, Jeremy Schmutz, Baohong Zhang, Gautam Sarath, Bingyu Zhao
BACKGROUND: Switchgrass (Panicum virgatum L.) is a warm-season perennial grass that can be used as a second generation bioenergy crop. However, foliar fungal pathogens, like switchgrass rust, have the potential to significantly reduce switchgrass biomass yield. Despite its importance as a prominent bioenergy crop, a genome-wide comprehensive analysis of NB-LRR disease resistance genes has yet to be performed in switchgrass. RESULTS: In this study, we used a homology-based computational approach to identify 1011 potential NB-LRR resistance gene homologs (RGHs) in the switchgrass genome (v 1...
November 8, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27819140/de-novo-balanced-complex-chromosome-rearrangements-involving-chromosomes-1b-and-3b-of-wheat-and-1r-of-rye
#15
Tianheng Ren, Zhi Li, Benju Yan, Feiquan Tan, Zongxiang Tang, Shulan Fu, Manyu Yang, Zhenglong Ren
Complex chromosome rearrangements (CCRs) are defined as structural abnormalities involving more than two chromosome breaks, coupled with exchanges of chromosomal segments. Information on CCRs in plants is limited. In the present study, a plant (26-4) harboring translocation chromosomes 1RS.1BL and 4RS.4DL was selected from a double monosomic (1R and 4R) addition line, which was derived from the hybrid between wheat cultivar MY11 and a Chinese local rye variety. The genome of the plant with double alien translocation chromosomes in the monosomic form showed more instability than that harboring a single translocation...
August 23, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/27807611/association-mapping-of-leaf-rust-resistance-loci-in-a-spring-wheat-core-collection
#16
M Kathryn Turner, James A Kolmer, Michael O Pumphrey, Peter Bulli, Shiaoman Chao, James A Anderson
We identified 15 potentially novel loci in addition to previously characterized leaf rust resistance genes from 1032 spring wheat accessions. Targeted AM subset panels were instrumental in revealing interesting loci. Leaf rust is a common disease of wheat, consistently reducing yields in many wheat-growing regions of the world. Although fungicides are commonly applied to wheat in the United States (US), genetic resistance can provide less expensive, yet effective control of the disease. Our objectives were to map leaf rust resistance genes in a large core collection of spring wheat accessions selected from the United States Department of Agriculture-Agricultural Research Service National Small Grains Collection (NSGC), determine whether previously characterized race-nonspecific resistance genes could be identified with our panel, and evaluate the use of targeted panels to identify seedling and adult plant resistance (APR) genes...
November 2, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/27795677/cytological-identification-of-an-aegilops-variabilis-chromosome-carrying-stripe-rust-resistance-in-wheat
#17
Laibin Zhao, Shunzong Ning, Jianjun Yu, Ming Hao, Lianquan Zhang, Zhongwei Yuan, Youliang Zheng, Dengcai Liu
Aegilops variabilis (UUS(v)S(v)), an important sources for wheat improvement, originated from chromosome doubling of a natural hybrid between Ae. umbellulata (UU) with Ae. longissima (S(l)S(l)). The Ae. variabilis karyotype was poorly characterized by fluorescent in situ hybridization (FISH). The FISH probe combination of pSc119.2, pTa71 and pTa-713 identified each of the 14 pairs of Ae. variabilis chromosomes. Our FISH ideogram was further used to detect an Ae. variabilis chromosome carrying stripe rust resistance in the background of wheat lines developed from crosses of the stripe rust susceptible bread wheat cultivar Yiyuan 2 with a resistant Ae...
September 2016: Breeding Science
https://www.readbyqxmd.com/read/27794028/sequence-of-the-sugar-pine-megagenome
#18
Kristian A Stevens, Jill Wegrzyn, Aleksey Zimin, Daniela Puiu, Marc Crepeau, Charis Cardeno, Robin Paul, Daniel Gonzalez-Ibeaz, Maxim Koriabine, Ann Holtz-Morris, Pedro Martinez-Garcia, Uzay Sezen, Guillaume Marcais, Kathy Jermstad, Patrick McGuire, Carol A Loopstra, John M Davis, Andrew Eckert, Pieter deJong, James A Yorke, Steven L Salzberg, David B Neale, Charles H Langley
Until very recently, complete characterization of the megagenomes of conifers has remained elusive. The diploid genome of sugar pine (Pinus lambertiana Dougl.) has a highly repetitive 31 billion base pair genome. With nearly 50% more DNA than the current record holder, Pinus taeda, sugar pine is the largest genome sequenced to date. This genome is the first to be sequenced from the subgenus Strobus, or white pines, a group that is notable for having the largest genomes among the pines. The genome represents a unique opportunity to investigate genome "obesity" in conifers and white pines...
October 28, 2016: Genetics
https://www.readbyqxmd.com/read/27792757/seedling-resistance-to-stem-rust-and-molecular-marker-analysis-of-resistance-genes-in-wheat-cultivars-of-yunnan-china
#19
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
#20
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
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