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rust resistance

Fei Tao, Junjuan Wang, Zhongfeng Guo, Jingjing Hu, Xiangming Xu, Jiarong Yang, Xianming Chen, Xiaoping Hu
Stripe rust, caused by Puccinia striiformis f. sp. tritici ( Pst ), is a destructive disease of wheat worldwide. The disease is preferably controlled by growing resistant cultivars. Wheat cultivar Xiaoyan 6 (XY 6) has been resistant to stripe rust since its release. In the previous studies, XY 6 was found to have higher-temperature seedling-plant (HTSP) resistance. However, the molecular mechanisms of HTSP resistance were not clear. To identify differentially expressed genes (DEGs) involved in HTSP resistance, we sequenced 30 cDNA libraries constructed from XY 6 seedlings exposed to several temperature treatments...
2018: Frontiers in Plant Science
Radhika Bartaula, Arthur T O Melo, Bryan A Connolly, Yue Jin, Iago Hale
Stem rust, caused by Puccinia graminis (Pg), remains a devastating disease of wheat; and the emergence of new Pg races virulent on deployed resistance genes fuels the ongoing search for sources of durable resistance. Despite its intrinsic durability, non-host resistance (NHR) is largely unexplored as a protection strategy against Pg, partly due to the inherent challenge of developing a genetically tractable system within which NHR segregates. Here we demonstrate that Pg's far less-studied ancestral host, barberry (Berberis spp...
February 26, 2018: Journal of Experimental Botany
Weizhen Liu, Yukiko Naruoka, Kaitlin Miller, Kimberly A Garland-Campbell, Arron H Carter
Stripe rust resistance is a critical need for wheat cultivars in the US Pacific Northwest (PNW). Our previous genome-wide association study (GWAS) for stripe rust resistance in a set of PNW winter wheat accessions (Panel-2) identified multiple marker-trait associations (MTAs) for both all-stage and field resistance. In this study, we conducted additional GWAS using a different set of PNW winter wheat accessions (Panel-1) that contained recently bred soft white winter wheat breeding lines and cultivars. A total of 12 all-stage resistance MTAs and eight field resistance MTAs were identified...
March 2018: Plant Genome
Eleonora Barilli, María J Cobos, Estefanía Carrillo, Andrzej Kilian, Jason Carling, Diego Rubiales
Pisum fulvum , a wild relative of pea is an important source of allelic diversity to improve the genetic resistance of cultivated species against fungal diseases of economic importance like the pea rust caused by Uromyces pisi . To unravel the genetic control underlying resistance to this fungal disease, a recombinant inbred line (RIL) population was generated from a cross between two P. fulvum accessions, IFPI3260 and IFPI3251, and genotyped using Diversity Arrays Technology. A total of 9,569 high-quality DArT-Seq and 8,514 SNPs markers were generated...
2018: Frontiers in Plant Science
Ying Hu, Jie Ren, Zhao Peng, Arnoldo A Umana, Ha Le, Tatiana Danilova, Junjie Fu, Haiyan Wang, Alison Robertson, Scot H Hulbert, Frank F White, Sanzhen Liu
Goss's wilt (GW) of maize is caused by the Gram-positive bacterium Clavibacter michiganensis subsp. nebraskensis (Cmn) and has spread in recent years throughout the Great Plains, posing a threat to production. The genetic basis of plant resistance is unknown. Here, a simple method for quantifying disease symptoms was developed and used to select cohorts of highly resistant and highly susceptible lines known as extreme phenotypes (XP). Copy number variation (CNV) analyses using whole genome sequences of bulked XP revealed 141 genes containing CNV between the two XP groups...
2018: Frontiers in Plant Science
Cuiling Yuan, Jingzheng Wu, Baiqiang Yan, Qunqun Hao, Chaozhong Zhang, Bo Lyu, Fei Ni, Allan Caplan, Jiajie Wu, Daolin Fu
Yr10 is an important gene to control wheat stripe rust, and the search for Yr10 needs to be continued. Wheat stripe rust or yellow rust is a devastating fungal disease caused by Puccinia striiformis f. sp. tritici (Pst). Host disease resistance offers a primary source for controlling wheat stripe rust. The stripe rust resistance gene Yr10 confers the race-specific resistance to most tested Pst races in China including CYR29. Early studies proposed that Yr10 was a nucleotide-binding site, leucine-rich repeat gene archived as GenBank accession AF149112 (hereafter designated the Yr10 candidate gene or Yr10CG )...
February 23, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Long Wang, Dan Zheng, Shuxia Zuo, Xianming Chen, Hua Zhuang, Lili Huang, Zhensheng Kang, Jie Zhao
Puccinia striiformis f.sp. tritici ( Pst ) is the causal agent of stripe (yellow) rust on wheat. It seriously threatens wheat production worldwide. The obligate biotrophic fungus is highly capable of producing new virulent races that can overcome resistance. Studying the inheritance of Pst virulence using the classical genetic approach was not possible until the recent discovery of its sexual stage on barberry plants. In the present study, 127 progeny isolates were obtained by selfing a representative Chinese Yellow Rust (CYR) race, CYR32, on Berberis aggregate ...
2018: Frontiers in Plant Science
Joseph Cremaldi, Bharat Bhushan
The mechanical properties, corrosion-resistance, and aesthetics of stainless steel make it one of the most important and widely used materials worldwide in the construction, food, and transportation industries just to name a few. In this paper we demonstrate how these properties can be further enhanced by changing the hydrophilic stainless steel surface to be superhydrophilic, superhydrophobic, or superliquiphobic. Creation of these functional surfaces requires hierarchical roughness and chemistry. Roughness is created using various pathways including sandblasting, chemical etching, and nanocomposite coatings...
February 13, 2018: Journal of Colloid and Interface Science
Tao Lang, Shixiao La, Bin Li, Zhihui Yu, Qiheng Chen, Jianbo Li, Ennian Yang, Guangrong Li, Zujun Yang
2 The wheat- Thinopyrum intermedium derived line Z4 has displayed novel and effective stripe rust resistance for over 40 years. This study aimed to precisely identify the chromosome constitution of Z4 and determine the stripe rust resistance contribution using multicolor fluorescent in situ hybridization (FISH) and molecular marker analysis. The results indicated that the Z4 line (2n=44) contained two pairs of non-Robertsonian translocations without the 3A chromosomes of wheat. FISH karyotypes of F3 progenies derived from crosses between Z4 and MY11 indicated that the transmission of the translocated chromosomes appeared normal and the number of wheat chromosomes 3A and 3D frequently varied...
February 22, 2018: Genome Génome / Conseil National de Recherches Canada
Peter Michael Dracatos, Rouja Haghdoust, Davinder Singh, Robert Fraser Park
Individual plants encounter a vast number of microbes including bacteria, viruses, fungi and oomycetes through their growth cycle, yet few of these pathogens are able to infect them. Plant species have diverged over millions of years, co-evolving with few specific pathogens. The host boundaries of most pathogen species can be clearly defined. In general, the greater the genetic divergence from the preferred host, the less likely that pathogen would be able to infect that plant species. Co-evolution and divergence also occur within pathogen species, leading to highly specialized subspecies with narrow host ranges...
February 21, 2018: New Phytologist
Marisa E Miller, Ying Zhang, Vahid Omidvar, Jana Sperschneider, Benjamin Schwessinger, Castle Raley, Jonathan M Palmer, Diana Garnica, Narayana Upadhyaya, John Rathjen, Jennifer M Taylor, Robert F Park, Peter N Dodds, Cory D Hirsch, Shahryar F Kianian, Melania Figueroa
Oat crown rust, caused by the fungus Pucinnia coronata f. sp. avenae , is a devastating disease that impacts worldwide oat production. For much of its life cycle, P. coronata f. sp. avenae is dikaryotic, with two separate haploid nuclei that may vary in virulence genotype, highlighting the importance of understanding haplotype diversity in this species. We generated highly contiguous de novo genome assemblies of two P. coronata f. sp. avenae isolates, 12SD80 and 12NC29, from long-read sequences. In total, we assembled 603 primary contigs for 12SD80, for a total assembly length of 99...
February 20, 2018: MBio
Feng Li, Yinghui Li, Lirong Cao, Peiyuan Liu, Miaomiao Geng, Qiang Zhang, Lina Qiu, Qixin Sun, Chaojie Xie
Wheat powdery mildew, caused by Blumeria graminis f. sp. tritici , and wheat leaf rust, caused by Puccinia triticina Eriks, are two important diseases that severely threaten wheat production. Sorento, a hexaploid triticale cultivar from Poland, shows high resistance to the wheat powdery mildew isolate E09 and the leaf rust isolate PHT in Beijing, China. To introduce resistance genes into common wheat, Sorento was crossed with wheat line Xuezao, which is susceptible to both diseases, and the F1 hybrids were then backcrossed with Xuezao as the recurrent male parent...
2018: Frontiers in Plant Science
Jun-Liang Yin, Zheng-Wu Fang, Cai Sun, Peng Zhang, Xing Zhang, Chen Lu, Shu-Ping Wang, Dong-Fang Ma, Yong-Xing Zhu
Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most devastating diseases of wheat. Resistant cultivars are the preferred strategy to control the disease. Space-induced wheat mutant R39 has adult-plant resistance (APR) to Pst. Genetic analysis indicated that a single recessive gene, designated YrR39, was responsible for the APR of R39 to Pst. Bulked segregant analysis (BSA) combined with a SLAF sequencing (SLAF-seq) strategy was used to fine-map YrR39 to a 17.39 Mb segment on chromosome 4B...
February 15, 2018: Scientific Reports
Daiyan Li, Dan Long, Tinghui Li, Yanli Wu, Yi Wang, Jian Zeng, Lili Xu, Xing Fan, Lina Sha, Haiqin Zhang, Yonghong Zhou, Houyang Kang
Background: Amphidiploids generated by distant hybridization are commonly used as genetic bridge to transfer desirable genes from wild wheat species into cultivated wheat. This method is typically used to enhance the resistance of wheat to biotic or abiotic stresses, and to increase crop yield and quality. Tetraploid Thinopyrum elongatum exhibits strong adaptability, resistance to stripe rust and Fusarium head blight, and tolerance to salt, drought, and cold. Results: In the present study, we produced hybrid derivatives by crossing and backcrossing the Triticum durum-Th...
2018: Molecular Cytogenetics
Kaori Ando, Sheri Rynearson, Kebede T Muleta, Jhonatan Gedamu, Bedada Girma, Nilsa A Bosque-Pérez, Ming-Shun Chen, Mike O Pumphrey
Northern areas of the western United States are one of the most productive wheat growing regions in the United States. Increasing productivity through breeding is hindered by several biotic stresses which slow and constrain targeted yield improvement. In order to understand genetic variation for stripe rust (Puccinia striiformis f. sp. tritici), Septoria tritici blotch (Mycosphaerella graminicola), and Hessian fly (Mayetiola destructor) in regional germplasm, a panel of 408 elite spring wheat lines was characterized and genotyped with an Illumina 9K wheat single nucleotide polymorphism (SNP) chip to enable genome-wide association study (GWAS) analyses...
2018: PloS One
Naeela Qureshi, Harbans Bariana, Vikas Venu Kumran, Sivasamy Muruga, Kerrie L Forrest, Mathew J Hayden, Urmil Bansal
A new leaf rust resistance gene Lr79 has been mapped in the long arm of chromosome 3B and a linked marker was identified for marker-assisted selection. Aus26582, a durum wheat landrace from the A. E. Watkins Collection, showed seedling resistance against durum-specific and common wheat-specific Puccinia triticina (Pt) pathotypes. Genetic analysis using a recombinant inbred line (RIL) population developed from a cross between Aus26582 and the susceptible parent Bansi with Australian Pt pathotype showed digenic inheritance and the underlying loci were temporarily named LrAW2 and LrAW3...
February 2, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Thomas Vatter, Andreas Maurer, Dragan Perovic, Doris Kopahnke, Klaus Pillen, Frank Ordon
The biotrophic rust fungi Puccinia hordei and Puccinia striiformis are important barley pathogens with the potential to cause high yield losses through an epidemic spread. The identification of QTL conferring resistance to these pathogens is the basis for targeted breeding approaches aiming to improve stripe rust and leaf rust resistance of modern cultivars. Exploiting the allelic richness of wild barley accessions proved to be a valuable tool to broaden the genetic base of resistance of barley cultivars. In this study, SNP-based nested association mapping (NAM) was performed to map stripe rust and leaf rust resistance QTL in the barley NAM population HEB-25, comprising 1,420 lines derived from BC1S3 generation...
2018: PloS One
Sol-Ji Song, Jung-Gu Kim
This study examined the synergic effect of alloying the element Cr and the environmental element Mg2+ ions on the corrosion property of a low-alloy steel in seawater at 60 °C, by means of electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) tests and weight-loss tests. The Mg2+ ions in seawater played an important role in lowering the electron transfer of the rust layer in the Cr-containing steel. The corrosion resistance of the Cr-containing steel is superior to that of blank steel in Mg2+ ions containing seawater...
January 20, 2018: Materials
Jason D Zurn, Matthew N Rouse, Shiaoman Chao, Meriem Aoun, Godwin Macharia, Colin W Hiebert, Zacharias A Pretorius, J Michael Bonman, Maricelis Acevedo
BACKGROUND: Research to identify and characterize stem rust resistance genes in common wheat, Triticum aestivum, has been stimulated by the emergence of Ug99-lineage races of the wheat stem rust pathogen, Puccinia graminis f. sp. tritici (Pgt), in Eastern Africa. The Montenegrin spring wheat landrace PI 362698 was identified as a source of Pgt resistance. This accession exhibits resistance to multiple Ug99-lineage and North American Pgt races at seedling and adult-plant stages. A recombinant inbred population was developed by crossing the susceptible line LMPG-6 with a single plant selection of PI 362698...
January 22, 2018: BMC Genomics
Wessam Akel, Patrick Thorwarth, Vilson Mirdita, Elmar A Weissman, Guozheng Liu, Tobias Würschum, C Friedrich H Longin
Spelt wheat is a distinct genetic group to elite bread wheat, but heterosis for yield and protein quality is too low for spelt to be recommended as heterotic group for hybrid breeding in wheat. The feasibility to switch from line to hybrid breeding is currently a hot topic in the wheat community. One limitation seems to be the lack of divergent heterotic groups within wheat adapted to a certain region. Spelt wheat is a hexaploid wheat that can easily be crossed with bread wheat and that forms a divergent genetic group when compared to elite bread wheat...
January 16, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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