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https://www.readbyqxmd.com/read/28286900/physical-mapping-of-dna-markers-linked-to-stem-rust-resistance-gene-sr47-in-durum-wheat
#1
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...
March 12, 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
#2
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...
March 8, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28264068/quantitative-trait-locus-analysis-for-spikelet-shape-related-traits-in-wild-wheat-progenitor-aegilops-tauschii-implications-for-intraspecific-diversification-and-subspecies-differentiation
#3
Ryo Nishijima, Yuki Okamoto, Hitoshi Hatano, Shigeo Takumi
Wild diploid wheat Aegilops tauschii, the D-genome progenitor of common wheat, carries large genetic variation in spikelet and grain morphology. Two differentiated subspecies of Ae. tauschii, subspecies tauschii and strangulata, have been traditionally defined based on differences in spikelet morphology. Here, we first assessed six spikelet shape-related traits among 199 Ae. tauschii accessions, and found that the accessions belonging to TauL1major lineage produced significantly longer spikes, higher spikelet density, and shorter, narrower spikelets than another major lineage, TauL2, in which the strangulata accessions are included...
2017: PloS One
https://www.readbyqxmd.com/read/28255671/identification-of-pm58-from-aegilops-tauschii
#4
Andrew T Wiersma, Jane A Pulman, Linda K Brown, Christina Cowger, Eric L Olson
A novel powdery mildew-resistance gene, designated Pm58, was introgressed directly from Aegilops tauschii to hexaploid wheat, mapped to chromosome 2DS, and confirmed to be effective under field conditions. Selectable KASP™ markers were developed for MAS. Powdery mildew caused by Blumeria graminis (DC.) f. sp. tritici (Bgt) remains a significant threat to wheat (Triticum aestivum L.) production. The rapid breakdown of race-specific resistance to Bgt reinforces the need to identify novel sources of resistance...
March 3, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28250587/bread-wheat-progenitors-aegilops-tauschii-dd-genome-and-triticum-dicoccoides-aabb-genome-reveal-differential-antioxidative-response-under-water-stress
#5
Yadhu Suneja, Anil Kumar Gupta, Navtej Singh Bains
Antioxidant enzymes are known to play a significant role in scavenging reactive oxygen species and maintaining cellular homeostasis. Activity of four antioxidant enzymes viz., superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) was examined in the flag leaves of nine Aegilops tauschii and three Triticum dicoccoides accessions along with two bread wheat cultivars under irrigated and rain-fed conditions. These accessions were shortlisted from a larger set on the basis of field performance for a set of morpho-physiological traits...
January 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/28224917/regulation-of-the-wheat-map-kinase-phosphatase-1-by-14-3-3-proteins
#6
Mouna Ghorbel, Valérie Cotelle, Chantal Ebel, Ikram Zaidi, Mélanie Ormancey, Jean-Philippe Galaud, Moez Hanin
Plant MAP kinase phosphatases (MKPs) are major regulators of MAPK signaling pathways and play crucial roles in controlling growth, development and stress responses. The presence of several functional domains in plant MKPs such as a dual specificity phosphatase catalytic domain, gelsolin, calmodulin-binding and serine-rich domains, suggests that MKPs can interact with distinct cellular partners, others than MAPKs. In this report, we identified a canonical mode I 14-3-3-binding motif (574KLPSLP579) located at the carboxy-terminal region of the wheat MKP, TMKP1...
April 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28187716/the-abundance-of-homoeologue-transcripts-is-disrupted-by-hybridization-and-is-partially-restored-by-genome-doubling-in-synthetic-hexaploid-wheat
#7
Ming Hao, Aili Li, Tongwei Shi, Jiangtao Luo, Lianquan Zhang, Xuechuan Zhang, Shunzong Ning, Zhongwei Yuan, Deying Zeng, Xingchen Kong, Xiaolong Li, Hongkun Zheng, Xiujin Lan, Huaigang Zhang, Youliang Zheng, Long Mao, Dengcai Liu
BACKGROUND: The formation of an allopolyploid is a two step process, comprising an initial wide hybridization event, which is later followed by a whole genome doubling. Both processes can affect the transcription of homoeologues. Here, RNA-Seq was used to obtain the genome-wide leaf transcriptome of two independent Triticum turgidum × Aegilops tauschii allotriploids (F1), along with their spontaneous allohexaploids (S1) and their parental lines. The resulting sequence data were then used to characterize variation in homoeologue transcript abundance...
February 10, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28163591/cytological-characterization-of-a-thermo-sensitive-cytoplasmic-male-sterile-wheat-line-having-k-type-cytoplasm-of-aegilops-kotschyi
#8
Liying Meng, Zihan Liu, Lingli Zhang, Gan Hu, Xiyue Song
Male sterility is an important tool for obtaining crop heterosis. A thermo-sensitive cytoplasmic male-sterile (TCMS) line was developed recently using a new method based on tiller regeneration. In the present study, we explored the critical growth stages required to maintain thermo-sensitive male sterility in TCMS lines and found that fertility is associated with abnormal tapetal and microspore development. We investigated the fertility and cytology of temperature-treated plant anthers at various developmental stages...
December 2016: Breeding Science
https://www.readbyqxmd.com/read/28130360/hybrid-assembly-of-the-large-and-highly-repetitive-genome-of-aegilops-tauschii-a-progenitor-of-bread-wheat-with-the-mega-reads-algorithm
#9
Aleksey V Zimin, Daniela Puiu, Ming-Cheng Luo, Tingting Zhu, Sergey Koren, Guillaume Marcais, James A Yorke, Jan Dvorak, Steven L Salzberg
LLong sequencing reads generated by single-molecule sequencing technology offer the possibility of dramatically improving the contiguity of genome assemblies. The biggest challenge today is that long reads have relatively high error rates, currently around 15%. The high error rates make it difficult to use this data alone, particularly with highly repetitive plant genomes. Errors in the raw data can lead to insertion or deletion errors (indels) in the consensus genome sequence, which in turn create significant problems for downstream analysis; for example, a single indel may shift the reading frame and incorrectly truncate a protein sequence...
January 27, 2017: Genome Research
https://www.readbyqxmd.com/read/28116459/homoeologous-recombination-based-transfer-and-molecular-cytogenetic-mapping-of-powdery-mildew-resistant-gene-pm57-from-aegilops-searsii-into-wheat
#10
Wenxuan Liu, Dal-Hoe Koo, Qing Xia, Chunxin Li, Fuqiang Bai, Yuli Song, Bernd Friebe, Bikram S Gill
Pm57, a novel resistant gene against powdery mildew, was transferred into common wheat from Ae. searsi and further mapped to 2S (s) #1L at an interval of FL0.75 to FL0.87. Powdery mildew, caused by the fungus Blumeria graminis f. sp. tritici, is one of the most severe foliar diseases of wheat causing reduction in grain yield and quality. Host plant resistance is the most effective and environmentally safe approach to control this disease. Tests of a set of Chinese Spring-Ae. searsii (S(s)S(s), 2n = 2x = 14) Feldman & Kislev ex K...
January 23, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28111365/plantrgdb-a-database-of-plant-retrocopied-genes
#11
Yi Wang
RNA-based gene duplication, known as retrocopy, plays important roles in gene origination and genome evolution. The genomes of many plants have been sequenced, offering an opportunity to annotate and mine the retrocopies in plant genomes. However, comprehensive and unified annotation of retrocopies in these plants is still lacking. In this study I constructed the PlantRGDB (Plant Retrocopied Gene DataBase), the first database of plant retrocopies, to provide a putatively complete centralized list of retrocopies in plant genomes...
January 22, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28087646/wheat-genotypes-with-combined-resistance-to-wheat-curl-mite-wheat-streak-mosaic-virus-wheat-mosaic-virus-and-triticum-mosaic-virus
#12
Wen-Po Chuang, Lina Maria Aguirre Rojas, Luaay Kahtan Khalaf, Guorong Zhang, Allan K Fritz, Anna E Whitfield, C Michael Smith
The wheat curl mite, Aceria tosichella Keifer, (WCM) is a global pest of bread wheat that reduces yields significantly. In addition, WCM carries Wheat streak mosaic virus (WSMV, family Potyviridae, genus Tritimovirus), the most significant wheat virus in North America; High Plains wheat mosaic virus (HPWMoV, genus Emaravirus, formerly High plains virus); and Triticum mosaic virus (TriMV, family Potyviridae, genus Poacevirus). Viruses carried by WCM have reduced wheat yields throughout the U.S. Great Plains for >50 yr, with average yield losses of 2-3% and occasional yield losses of 7-10%...
January 13, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28046090/spatial-pattern-and-scale-influence-invader-demographic-response-to-simulated-precipitation-change-in-an-annual-grassland-community
#13
Meghan J Skaer Thomason, Kevin J Rice
It is important to predict which invasive species will benefit from future changes in climate, and thereby identify those invaders that need particular attention and prioritization of management efforts. Because establishment, persistence, and spread determine invasion success, this prediction requires detailed demographic information. Explicit study of the impact of pattern on demographic response is particularly important for species that are naturally patchy, such as the invasive grass, Aegilops triuncialis...
2017: PloS One
https://www.readbyqxmd.com/read/28042823/identification-and-analysis-of-rna-editing-sites-in-the-chloroplast-transcripts-of-aegilops-tauschii-l
#14
Mengxing Wang, Hui Liu, Lingqiao Ge, Guangwei Xing, Meng Wang, Song Weining, Xiaojun Nie
RNA editing is an important way to convert cytidine (C) to uridine (U) at specific sites within RNA molecules at a post-transcriptional level in the chloroplasts of higher plants. Although it has been systematically studied in many plants, little is known about RNA editing in the wheat D genome donor Aegilops tauschii L. Here, we investigated the chloroplast RNA editing of Ae. tauschii and compared it with other wheat relatives to trace the evolution of wheat. Through bioinformatics prediction, a total of 34 C-to-U editing sites were identified, 17 of which were validated using RT-PCR product sequencing...
December 30, 2016: Genes
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
#15
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
https://www.readbyqxmd.com/read/27994180/chromosomal-structural-changes-and-microsatellite-variations-in-newly-synthesized-hexaploid-wheat-mediated-by-unreduced-gametes
#16
Hao Li, Yajuan Wang, Xiaoxue Guo, Yinpeng Du, Changyou Wang, Wanquan Ji
Allohexaploid wheat was derived from interspecific hybridization, followed by spontaneous chromosome doubling. Newly synthesized hexaploid wheat by crossing Triticum turgidum and Aegilops tauschii provides a classical model to understand the mechanisms of allohexaploidization in wheat. However, immediate chromosome level variation and microsatellite level variation of newly synthesized hexaploid wheat have been rarely reported. Here, unreduced gametes were applied to develop synthesized hexaploid wheat, NA0928, population by crossing T...
December 2016: Journal of Genetics
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
#17
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/27942245/molecular-diversity-of-%C3%AE-gliadin-expressed-genes-in-genetically-contrasted-spelt-triticum-aestivum-ssp-spelta-accessions-and-comparison-with-bread-wheat-t-aestivum-ssp-aestivum-and-related-diploid-triticum-and-aegilops-species
#18
Benjamin Dubois, Pierre Bertin, Dominique Mingeot
The gluten proteins of cereals such as bread wheat (Triticum aestivum ssp. aestivum) and spelt (T. aestivum ssp. spelta) are responsible for celiac disease (CD). The α-gliadins constitute the most immunogenic class of gluten proteins as they include four main T-cell stimulatory epitopes that affect CD patients. Spelt has been less studied than bread wheat and could constitute a source of valuable diversity. The objective of this work was to study the genetic diversity of spelt α-gliadin transcripts and to compare it with those of bread wheat...
2016: Molecular Breeding: New Strategies in Plant Improvement
https://www.readbyqxmd.com/read/27929044/salt-tolerance-during-germination-and-seedling-growth-of-wild-wheat-aegilops-tauschii-and-its-impact-on-the-species-range-expansion
#19
Daisuke Saisho, Shigeo Takumi, Yoshihiro Matsuoka
Adaptation to edaphic stress may have a key role in plant species range expansion. Aegilops tauschii Coss., the common wheat's D-genome progenitor native to the Transcaucasus-Middle East region, is a good model to study the relationships between soil salinity and plant distributions: one of its intraspecific sublineages, TauL1b, drove the long-distance eastward expansion of this species range reaching semi-arid-central Asia. Salt tolerance during germination and seedling growth was evaluated in 206 Ae. tauschii accessions by treating seeds with NaCl solutions differing in concentrations...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917571/comparative-germination-responses-to-water-potential-across-different-populations-of-aegilops-geniculata-and-cultivar-varieties-of-triticum-durum-and-triticum-aestivum
#20
S Orsenigo, F Guzzon, T Abeli, G Rossi, I Vagge, A Balestrazzi, A Mondoni, J V Müller
Crop Wild Relatives are often used to improve crop quality and yields because they contain genetically important traits that can contribute to stress resistance and adaptation. Seed germination of different populations of Aegilops geniculata Roth collected along a latitudinal gradient was studied under different drought stress in order to find populations suitable for improving drought tolerance in wheat. Different accessions of Aegilops neglecta Req. ex Bertol., Triticum aestivum L. and T. durum Desf. were used as comparison...
March 2017: Plant Biology
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