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1. The Parastagonospora nodorum necrotrophic effector SnTox5 targets the wheat gene Snn5 and facilitates entry into the leaf mesophyll

Author:
Steven S. Xu,   et al.   ; Gayan K. Kariyawasam; Jonathan K. Richards; Nathan A. Wyatt; Katherine L. D. Running; Zhaohui Liu; Pawel Borowicz; Justin D. Faris; Timothy L. Friesen;     Show all 9 Authors
Source:
The new phytologist 2022 v.233 no.1 pp. 409-426
ISSN:
0028-646X
Subject:
Parastagonospora nodorum; confocal microscopy; fungi; gain-of-function mutation; gene targeting; genes; genome-wide association study; haplotypes; leaves; mesophyll; mutants; pathogenesis; pathogens; programmed cell death; quantitative polymerase chain reaction; quantitative trait loci; wheat
Abstract:
... Parastagonospora nodorum is an economically important necrotrophic fungal pathogen of wheat. Parastagonospora nodorum secretes necrotrophic effectors that target wheat susceptibility genes to induce programmed cell death (PCD). In this study, we cloned and functionally validated SnTox5 and characterized its role in pathogenesis. We used whole genome sequencing, genome‐wide association study (GWAS) ...
DOI:
10.1111/nph.17602

2. A triple threat: the Parastagonospora nodorum SnTox267 effector exploits three distinct host genetic factors to cause disease in wheat

Author:
Steven S. Xu,   et al.   ; Jonathan K. Richards; Gayan K. Kariyawasam; Sudeshi Seneviratne; Nathan A. Wyatt; Zhaohui Liu; Justin D. Faris; Timothy L. Friesen;     Show all 8 Authors
Source:
The new phytologist 2022 v.233 no.1 pp. 427-442
ISSN:
0028-646X
Subject:
Parastagonospora nodorum; bioinformatics; complementary genes; fungi; gain-of-function mutation; models; pathogens; programmed cell death; protein isoforms; quantitative polymerase chain reaction; virulence; wheat
Abstract:
... Parastagonospora nodorum is a fungal pathogen of wheat. As a necrotrophic specialist, it deploys effector proteins that target dominant host susceptibility genes to elicit programmed cell death (PCD). Here we identify and functionally validate the effector targeting the host susceptibility genes Snn2, Snn6 and Snn7. We utilized whole‐genome sequencing, association mapping, gene‐disrupted mutants, ...
DOI:
10.1111/nph.17601

3. A protein kinase–major sperm protein gene hijacked by a necrotrophic fungal pathogen triggers disease susceptibility in wheat

Author:
Steven S. Xu,   et al.   ; Zengcui Zhang; Katherine L. D. Running; Sudeshi Seneviratne; Amanda R. Peters Haugrud; Agnes Szabo‐Hever; Gongjun Shi; Robert Brueggeman; Timothy L. Friesen; Justin D. Faris;     Show all 10 Authors
Source:
plant journal 2021 v.106 no.3 pp. 720-732
ISSN:
0960-7412
Subject:
Aegilops tauschii; Parastagonospora nodorum; Triticum aestivum; disease susceptibility; fungi; genes; mutagenesis; pathogens; protein kinases; spermatozoa; transcription (genetics); wheat; wheat allergy; Caspian Sea
Abstract:
... Septoria nodorum blotch (SNB), a disease caused by the necrotrophic fungal pathogen Parastagonospora nodorum, is a threat to wheat (Triticum aestivum) production worldwide. Multiple inverse gene‐for‐gene interactions involving the recognition of necrotrophic effectors (NEs) by wheat sensitivity genes play major roles in causing SNB. One interaction involves the wheat gene Snn3 and the P. nodorum N ...
DOI:
10.1111/tpj.15194

4. Dissection and physical mapping of wheat chromosome 7B by inducing meiotic recombination with its homoeologues in Aegilops speltoides and Thinopyrum elongatum

Author:
Steven S. Xu,   et al.   ; Mingyi Zhang; Wei Zhang; Xianwen Zhu; Qing Sun; Changhui Yan; Jason Fiedler; Xiwen Cai;     Show all 8 Authors
Source:
Theoretical and applied genetics 2020 v.133 no.12 pp. 3455-3467
ISSN:
0040-5752
Subject:
Aegilops speltoides; Thinopyrum elongatum; Triticum; chromosome aberrations; chromosomes; fluorescence in situ hybridization; gene pool; genetic engineering; genetic markers; genetic recombination; genetic variation; genome; genomics; genotyping; homozygosity; introgression; marker-assisted selection; meiosis; monosomics; mutants; physical chromosome mapping; plant improvement; sequence analysis; single nucleotide polymorphism; wheat; wild relatives
Abstract:
... KEY MESSAGE: We constructed a homoeologous recombination-based bin map of wheat chromosome 7B, providing a unique physical framework for further study of chromosome 7B and its homoeologues in wheat and its relatives. Homoeologous recombination leads to the dissection and diversification of the wheat genome. Advances in genome sequencing and genotyping have dramatically improved the efficacy and th ...
Handle:
10113/7144875
DOI:
10.1007/s00122-020-03680-3

5. Pyrenophora tritici-repentis Race 4 Isolates Cause Disease on Tetraploid Wheat

Author:
Steven S. Xu,   et al.   ; Jingwei Guo; Gongjun Shi; Audrey Kalil; Andrew Friskop; Elias Elias; Justin D. Faris; Zhaohui Liu;     Show all 8 Authors
Source:
Phytopathology 2020 v.110 no.11 pp. 1781-1790
ISSN:
0031-949X
Subject:
Pyrenophora tritici-repentis; Triticum aestivum; cultivars; durum wheat; fungi; genomics; pathogens; plant pathology; quantitative trait loci; tetraploidy; virulence; North Dakota
Abstract:
... The ascomycete fungus Pyrenophora tritici-repentis is the causal agent of tan spot of wheat. The disease can occur on both common wheat (Triticum aestivum) and durum wheat (T. turgidum ssp. durum) and has potential to cause significant yield and quality losses. The fungal pathogen is known to produce necrotrophic effectors (NEs) that act as important virulence factors. Based on the NE production a ...
DOI:
10.1094/PHYTO-05-20-0179-R

6. Genome-wide association mapping of tan spot resistance in a worldwide collection of durum wheat

Author:
Steven S. Xu,   et al.   ; Nelomie Galagedara; Yuan Liu; Jason Fiedler; Gongjun Shi; Shiaoman Chiao; Justin D. Faris; Xuehui Li; Zhaohui Liu;     Show all 9 Authors
Source:
Theoretical and applied genetics 2020 v.133 no.7 pp. 2227-2237
ISSN:
0040-5752
Subject:
durum wheat; foliar diseases; fungi; genes; genetic resistance; genome-wide association study; genotyping by sequencing; loci; quantitative trait loci; tetraploidy
Abstract:
... KEY MESSAGE: Resistance to tan spot in durum wheat involves race-nonspecific QTL and necrotrophic insensitivity gene. Tan spot, caused by the necrotrophic fungus Pyrenophoratritici-repentis, is a major foliar disease on all cultivated wheat crops worldwide. Compared to common wheat, much less work has been done to investigate the genetic basis of tan spot resistance in durum. Here, we conducted di ...
DOI:
10.1007/s00122-020-03593-1

7. QTL mapping of resistance to tan spot induced by race 2 of Pyrenophora tritici-repentis in tetraploid wheat

Author:
Steven S. Xu,   et al.   ; Yuan Liu; Qijun Zhang; Evan Salsman; Jason D. Fiedler; Justin B. Hegstad; Zhaohui Liu; Justin D. Faris; Xuehui Li;     Show all 9 Authors
Source:
Theoretical and applied genetics 2020 v.133 no.2 pp. 433-442
ISSN:
0040-5752
Subject:
Pyrenophora tritici-repentis; breads; cultivars; durum wheat; foliar diseases; food crops; fungi; hexaploidy; pathogens; tetraploidy
Abstract:
... KEY MESSAGE: A total of 12 QTL conferring resistance to tan spot induced by a race 2 isolate, 86-124, were identified in three tetraploid wheat mapping populations. Durum is a tetraploid species of wheat and an important food crop. Tan spot, caused by the necrotrophic fungal pathogen Pyrenophora tritici-repentis (Ptr), is a major foliar disease of both tetraploid durum wheat and hexaploid bread wh ...
DOI:
10.1007/s00122-019-03474-2

8. Identification of a major dominant gene for race-nonspecific tan spot resistance in wild emmer wheat

Author:
Steven S. Xu,   et al.   ; Justin D. Faris; Megan E. Overlander; Gayan K. Kariyawasam; Arron Carter; Zhaohui Liu;     Show all 6 Authors
Source:
Theoretical and applied genetics 2020 v.133 no.3 pp. 829-841
ISSN:
0040-5752
Subject:
Pyrenophora tritici-repentis; Triticum turgidum subsp. dicoccoides; Triticum turgidum subsp. dicoccon; chromosome substitution; cultivars; dominant genes; durum wheat; foliar diseases; fungi; genetic analysis; hexaploidy; loci; marker-assisted selection; pathogens; quantitative traits; tetraploidy
Abstract:
... KEY MESSAGE: A single dominant gene found in tetraploid and hexaploid wheat controls broad-spectrum race-nonspecific resistance to the foliar disease tan spot caused by Pyrenophora tritici-repentis. Tan spot is an important foliar disease of durum and common wheat caused by the necrotrophic fungal pathogen Pyrenophora tritici-repentis. Genetic studies in common wheat have shown that pathogen-produ ...
DOI:
10.1007/s00122-019-03509-8

9. Development and characterization of wheat–sea wheatgrass (Thinopyrum junceiforme) amphiploids for biotic stress resistance and abiotic stress tolerance

Author:
Steven S. Xu,   et al.   ; Wanlong Li; Qijun Zhang; Shuwen Wang; Marie A. Langham; Dilkaran Singh; Robert L. Bowden;     Show all 7 Authors
Source:
Theoretical and applied genetics 2019 v.132 no.1 pp. 163-175
ISSN:
0040-5752
Subject:
Fusarium head blight; Thinopyrum bessarabicum; Thinopyrum elongatum; Thinopyrum junceiforme; Thinopyrum junceum; Triticum turgidum subsp. dicoccon; Wheat streak mosaic virus; abiotic stress; allotetraploidy; biotic stress; chromosomes; crop production; disease resistance; flooded conditions; gene transfer; genetic improvement; genome; genomics; heat; in situ hybridization; insects; manganese; nitrogen; pests; salinity; stems; stress tolerance; temperature; toxicity; wheat
Abstract:
... KEY MESSAGE: Development of a complete wheat–Thinopyrum junceiforme amphiploid facilitated identification of resistance to multiple pests and abiotic stress derived from the wild species and shed new light on its genome composition. Wheat production is facing numerous challenges from biotic and abiotic stresses. Alien gene transfer has been an effective approach for wheat germplasm enhancement. Th ...
Handle:
10113/6272379
DOI:
10.1007/s00122-018-3205-4

10. Partitioning and physical mapping of wheat chromosome 3B and its homoeologue 3E in Thinopyrum elongatum by inducing homoeologous recombination

Author:
Steven S. Xu,   et al.   ; Mingyi Zhang; Wei Zhang; Xianwen Zhu; Qing Sun; Shiaoman Chao; Changhui Yan; Jason Fiedler; Xiwen Cai;     Show all 9 Authors
Source:
Theoretical and applied genetics 2020 v.133 no.4 pp. 1277-1289
ISSN:
0040-5752
Subject:
Thinopyrum elongatum; Triticum aestivum; chromosomes; fluorescence; genome; genomics; genotyping; homozygosity; introgression; monosomics; mutants; single nucleotide polymorphism; wheat
Abstract:
... KEY MESSAGE: We performed homoeologous recombination-based partitioning and physical mapping of wheat chromosome 3B and Th. elongatum chromosome 3E, providing a unique physical framework of this homoeologous pair for genome studies. The wheat (Triticum aestivum, 2n = 6x = 42, AABBDD) and Thinopyrum elongatum (2n = 2x = 14, EE) genomes can be differentiated from each other by fluorescent genomic in ...
DOI:
10.1007/s00122-020-03547-7

11. Unique fertility restoration suppressor genes for male-sterile CMS ANN2 and CMS ANN3 cytoplasms in sunflower (Helianthus annuus L.)

Author:
Steven S. Xu,   et al.   ; Zhao Liu; Yunming Long; Gerald J. Seiler; Chao-Chien Jan;     Show all 5 Authors
Source:
Molecular breeding 2019 v.39 no.2 pp. 22
ISSN:
1380-3743
Subject:
Helianthus annuus; cytoplasmic male sterility; dominant genes; genetic markers; inbred lines; linkage groups; microsatellite repeats; progeny; single nucleotide polymorphism; suppressor genes; testcrosses
Abstract:
... Single dominant fertility restoration (Rf) genes for cytoplasmic male-sterile (CMS) sunflower lines CMS ANN2 and CMS ANN3 were previously identified in three and five sources, respectively. However, expressions of the dominant Rf genes were suppressed when crossing restoration lines with three inbred lines. Preliminary results indicated that segregation of fertility in most testcross progeny famil ...
DOI:
10.1007/s11032-018-0922-y
CHORUS:
10.1007/s11032-018-0922-y

12. Haplotype variants of Sr46 in Aegilops tauschii, the diploid D genome progenitor of wheat

Author:
Steven S. Xu,   et al.   ; Naveenkumar Athiyannan; Yunming Long; Houyang Kang; Sutha Chandramohan; Dhara Bhatt; Qijun Zhang; Daryl L. Klindworth; Matthew N. Rouse; Timothy L. Friesen; Robert McIntosh; Peng Zhang; Kerrie Forrest; Mathew Hayden; Mehran Patpour; Mogens S. Hovmøller; Lee T. Hickey; Michael Ayliffe; Xiwen Cai; Evans S. Lagudah; Sambasivam Periyannan;     Show all 21 Authors
Source:
Theoretical and applied genetics 2022 v.135 no.8 pp. 2627-2639
ISSN:
0040-5752
Subject:
Aegilops tauschii; Puccinia graminis; alleles; amino acid sequences; amino acids; diploidy; genetic analysis; genetic markers; haplotypes; nucleotide sequences; nucleotides; pathogens; sequence analysis; stem rust; virulence; wheat
Abstract:
... KEY MESSAGE: Stem rust resistance genes, SrRL5271 and Sr672.1 as well as SrCPI110651, from Aegilops tauschii, the diploid D genome progenitor of wheat, are sequence variants of Sr46 differing by 1–2 nucleotides leading to non-synonymous amino acid substitutions. The Aegilops tauschii (wheat D-genome progenitor) accessions RL 5271 and CPI110672 were identified as resistant to multiple races (includ ...
DOI:
10.1007/s00122-022-04132-w

13. Function and evolution of allelic variations of Sr13 conferring resistance to stem rust in tetraploid wheat (Triticum turgidum L.)

Author:
Steven S. Xu,   et al.   ; Baljeet K. Gill; Daryl L. Klindworth; Matthew N. Rouse; Jinglun Zhang; Qijun Zhang; Jyoti S. Sharma; Chenggen Chu; Yunming Long; Shiaoman Chao; Pablo D. Olivera; Timothy L. Friesen; Shaobin Zhong; Yue Jin; Justin D. Faris; Jason D. Fiedler; Elias M. Elias; Shuyu Liu; Xiwen Cai;     Show all 19 Authors
Source:
plant journal 2021 v.106 no.6 pp. 1674-1691
ISSN:
0960-7412
Subject:
Puccinia graminis; Triticum turgidum; alleles; durum wheat; evolution; genetically modified organisms; haplotypes; mutants; nucleotides; point mutation; resistance genes; sequence analysis; stem rust; tetraploidy
Abstract:
... The resistance gene Sr13 is one of the most important genes in durum wheat for controlling stem rust caused by Puccinia graminis f. sp. tritici (Pgt). The Sr13 functional gene CNL13 has haplotypes R1, R2 and R3. The R1/R3 and R2 haplotypes were originally designated as alleles Sr13a and Sr13b, respectively. To detect additional Sr13 alleles, we developed Kompetitive allele specific PCR (KASP™) mar ...
DOI:
10.1111/tpj.15263

14. Molecular mapping of QTL for Fusarium head blight resistance introgressed into durum wheat

Author:
Steven S. Xu,   et al.   ; Mingxia Zhao; Yueqiang Leng; Shiaoman Chao; Shaobin Zhong;     Show all 5 Authors
Source:
Theoretical and applied genetics 2018 v.131 no.9 pp. 1939-1951
ISSN:
0040-5752
Subject:
Fusarium graminearum; Fusarium head blight; chromosome mapping; cultivars; durum wheat; field experimentation; genotyping; greenhouse experimentation; greenhouses; hexaploidy; inbred lines; introgression; phenotype; phenotypic variation; quantitative trait loci; single nucleotide polymorphism; tetraploidy; North Dakota
Abstract:
... KEY MESSAGE: The major QTL for FHB resistance from hexaploid wheat line PI 277012 was successfully introgressed into durum wheat and minor FHB resistance QTL were detected in local durum wheat cultivars. A combination of these QTL will enhance FHB resistance of durum wheat. Fusarium head blight (FHB), caused by Fusarium graminearum, is a devastating disease of durum wheat. To combat the disease, g ...
Handle:
10113/6088936
DOI:
10.1007/s00122-018-3124-4

15. Genetic analysis of threshability and other spike traits in the evolution of cultivated emmer to fully domesticated durum wheat

Author:
Steven S. Xu,   et al.   ; Jyoti S. Sharma; Katherine L. D. Running; Qijun Zhang; Amanda R. Peters Haugrud; Sapna Sharma; Phillip E. McClean; Justin D. Faris;     Show all 8 Authors
Source:
Molecular genetics and genomics 2019 v.294 no.3 pp. 757-771
ISSN:
1617-4615
Subject:
Triticum turgidum subsp. dicoccon; alleles; domestication; durum wheat; evolution; genetic analysis; genetic background; genomics; loci; phenotype; pleiotropy; quantitative traits; spikelets
Abstract:
... Genetic mutations in genes governing wheat threshability were critical for domestication. Knowing when these genes mutated during wheat evolution will provide more insight into the domestication process and lead to further exploitation of primitive alleles for wheat improvement. We evaluated a population of recombinant inbred lines derived from a cross between the durum variety Rusty and the culti ...
DOI:
10.1007/s00438-019-01544-0
CHORUS:
10.1007/s00438-019-01544-0

16. Cloning and characterization of the homoeologous genes for the Rec8-like meiotic cohesin in polyploid wheat

Author:
Steven S. Xu,   et al.   ; Guojia Ma; Wei Zhang; Liwang Liu; Wun S. Chao; Yong Qiang Gu; Lili Qi; Xiwen Cai;     Show all 8 Authors
Source:
BMC plant biology 2018 v.18 no.1 pp. 224
ISSN:
1471-2229
Subject:
Aegilops tauschii; DNA; Western blotting; amino acids; antibodies; chromosome segregation; cohesion; diploidy; eukaryotic cells; evolution; food crops; gametogenesis; gene expression regulation; genetic variation; hexaploidy; humans; introns; meiosis; models; sexual reproduction; single nucleotide polymorphism; tetraploidy; transcription (genetics); wheat
Abstract:
... BACKGROUND: Meiosis is a specialized cell division critical for gamete production in the sexual reproduction of eukaryotes. It ensures genome integrity and generates genetic variability as well. The Rec8-like cohesin is a cohesion protein essential for orderly chromosome segregation in meiotic cell division. The Rec8-like genes and cohesins have been cloned and characterized in diploid models, but ...
DOI:
10.1186/s12870-018-1442-y
PubMed:
30305022
PubMed Central:
PMC6180652

17. Molecular cytogenetic and genomic analyses reveal new insights into the origin of the wheat B genome

Author:
Steven S. Xu,   et al.   ; Wei Zhang; Mingyi Zhang; Xianwen Zhu; Yaping Cao; Qing Sun; Guojia Ma; Shiaoman Chao; Changhui Yan; Xiwen Cai;     Show all 10 Authors
Source:
Theoretical and applied genetics 2018 v.131 no.2 pp. 365-375
ISSN:
0040-5752
Subject:
Aegilops speltoides; allopolyploidy; ancestry; chromosomes; genome; genomics; polyphyly; wheat
Abstract:
... KEY MESSAGE: This work pinpointed the goatgrass chromosomal segment in the wheat B genome using modern cytogenetic and genomic technologies, and provided novel insights into the origin of the wheat B genome. Wheat is a typical allopolyploid with three homoeologous subgenomes (A, B, and D). The donors of the subgenomes A and D had been identified, but not for the subgenome B. The goatgrass Aegilops ...
Handle:
10113/5900028
DOI:
10.1007/s00122-017-3007-0
CHORUS:
10.1007/s00122-017-3007-0

18. Physical mapping of DNA markers linked to stem rust resistance gene Sr47 in durum wheat

Author:
Steven S. Xu,   et al.   ; Daryl L. Klindworth; Jyoti Saini; Yunming Long; Matthew N. Rouse; Justin D. Faris; Yue Jin;     Show all 7 Authors
Source:
Theoretical and applied genetics 2017 v.130 no.6 pp. 1135-1154
ISSN:
0040-5752
Subject:
Aegilops speltoides; Puccinia graminis; Triticum turgidum subsp. durum; chromosome mapping; chromosome translocation; chromosomes; cultivars; disease resistance; durum wheat; genes; genetic markers; genetic resistance; genotyping; marker-assisted selection; microsatellite repeats; pathogens; polymerase chain reaction; progeny; races; single nucleotide polymorphism; stem rust
Abstract:
... 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 gra ...
Handle:
10113/5700692
DOI:
10.1007/s00122-017-2875-7

19. Identification, mapping, and marker development of stem rust resistance genes in durum wheat ‘Lebsock’

Author:
Steven S. Xu,   et al.   ; Jyoti Saini; Justin D. Faris; Qijun Zhang; Matthew N. Rouse; Yue Jin; Yunming Long; Daryl L. Klindworth; Elias M. Elias; Phillip E. McClean; Michael C. Edwards;     Show all 11 Authors
Source:
Molecular breeding 2018 v.38 no.6 pp. 77
ISSN:
1380-3743
Subject:
Puccinia graminis; Triticum turgidum subsp. durum; crop production; cultivars; disease resistance; doubled haploids; durum wheat; germplasm; pathotypes; polymerase chain reaction; quantitative trait loci; races; resistance genes; stem rust; tetraploidy; Great Plains region; United States
Abstract:
... Wheat production in many wheat-growing regions is vulnerable to stem rust, caused by Puccinia graminis f. sp. tritici (Pgt). Several previous studies showed that most of the durum cultivars adapted to the upper Great Plains in the USA have good resistance to the major Pgt pathotypes, including the Ug99 race group. To identify the stem rust resistance (Sr) genes in the durum cultivar ‘Lebsock’, a t ...
DOI:
10.1007/s11032-018-0833-y

20. Mapping and characterization of two stem rust resistance genes derived from cultivated emmer wheat accession PI 193883

Author:
Steven S. Xu,   et al.   ; Jyoti S. Sharma; Qijun Zhang; Matthew N. Rouse; Daryl L. Klindworth; Timothy L. Friesen; Yunming Long; Pablo D. Olivera; Yue Jin; Phillip E. McClean; Justin D. Faris;     Show all 11 Authors
Source:
Theoretical and applied genetics 2019 v.132 no.11 pp. 3177-3189
ISSN:
0040-5752
Subject:
Puccinia graminis; Triticum turgidum subsp. dicoccon; alleles; durum wheat; epistasis; fungi; genotyping; haplotypes; inbred lines; microsatellite repeats; pathogens; resistance genes; stem rust
Abstract:
... KEY MESSAGE: Two stem rust resistance genes identified on chromosome arms 2BL and 6AL of the cultivated emmer wheat accession PI 193883 can be used for protecting modern varieties against Ug99 strains. The wheat research community consistently strives to identify new genes that confer resistance to stem rust caused by the fungal pathogen Puccinia graminis f. sp. tritici Eriks & E. Henn (Pgt). In t ...
DOI:
10.1007/s00122-019-03417-x