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https://www.readbyqxmd.com/read/28724065/comparative-mapping-and-targeted-capture-sequencing-of-the-gametocidal-loci-in-aegilops-sharonensis
#1
Surbhi Grewal, Laura-Jayne Gardiner, Barbora Ndreca, Emilie Knight, Graham Moore, Ian P King, Julie King
Gametocidal (Gc) chromosomes or elements in species such as Eig are preferentially transmitted to the next generation through both the male and female gametes when introduced into wheat ( L.). Furthermore, any genes, such as genes that control agronomically important traits, showing complete linkage with Gc elements, are also transmitted preferentially to the next generation without the need for selection. The mechanism for the preferential transmission of the Gc elements appears to occur by the induction of extensive chromosome damage in any gametes that lack the Gc chromosome in question...
July 2017: Plant Genome
https://www.readbyqxmd.com/read/28711956/mapping-stripe-rust-resistance-gene-yrzh22-in-chinese-wheat-cultivar-zhoumai-22-by-bulked-segregant-rna-seq-bsr-seq-and-comparative-genomics-analyses
#2
Yong Wang, Jingzhong Xie, Huaizhi Zhang, Bingmin Guo, Shunzong Ning, Yongxing Chen, Ping Lu, Qiuhong Wu, Miaomiao Li, Deyun Zhang, Guanghao Guo, Yan Zhang, Dengcai Liu, Shaokui Zou, Jianwei Tang, Hong Zhao, Xicheng Wang, Jun Li, Wuyun Yang, Tingjie Cao, Guihong Yin, Zhiyong Liu
A stripe rust resistance gene YrZH22 was mapped by combined BSR-Seq and comparative genomics analyses to a 5.92 centimorgan (cM) genetic interval spanning a 4 Mb physical genomic region on wheat chromosome 4BL1. Stripe rust, caused by Puccinia striiformis f. sp. tritici (PST), is one of the most destructive diseases of wheat and severely threatens wheat production worldwide. The widely grown Chinese wheat cultivar Zhoumai 22 is highly resistant to the current prevailing PST race CYR34 (V26). Genetic analysis of F5:6 and F6:7 recombinant inbred line (RIL) populations indicated that adult-plant stripe rust resistance in Zhoumai 22 is controlled by a single gene, temporarily designated YrZH22...
July 15, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28704468/thmyc4e-candidate-blue-aleurone-1-gene-controlling-the-associated-trait-in-triticum-aestivum
#3
Na Li, Shiming Li, Kunpu Zhang, Wenjie Chen, Bo Zhang, Daowen Wang, Dengcai Liu, Baolong Liu, Huaigang Zhang
Blue aleurone is a useful and interesting trait in common wheat that was derived from related species. Here, transcriptomes of blue and white aleurone were compared for isolating Blue aleurone 1 (Ba1) transferred from Thinopyrum ponticum. In the genes involved in anthocyanin biosynthesis, only a basic helix-loop-helix (bHLH) transcription factor, ThMYC4E, had a higher transcript level in blue aleurone phenotype, and was homologous to the genes on chromosome 4 of Triticum aestivum. ThMYC4E carried the characteristic domains (bHLH-MYC_N, HLH and ACT-like) of a bHLH transcription factor, and clustered with genes regulating anthocyanin biosynthesis upon phylogenetic analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28702048/aegilops-tauschii-accessions-with-geographically-diverse-origin-show-differences-in-chromosome-organization-and-polymorphism-of-molecular-markers-linked-to-leaf-rust-and-powdery-mildew-resistance-genes
#4
Maciej Majka, Michał T Kwiatek, Joanna Majka, Halina Wiśniewska
Aegilops tauschii (2n = 2x = 14) is a diploid wild species which is reported as a donor of the D-genome of cultivated bread wheat. The main goal of this study was to examine the differences and similarities in chromosomes organization among accessions of Ae. tauschii with geographically diversed origin, which is believed as a potential source of genes, especially determining resistance to fungal diseases (i.e., leaf rust and powdery mildew) for breeding of cereals. We established and compared the fluorescence in situ hybridization patterns of 21 accessions of Ae...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28659955/five-fatty-acyl-coenzyme-a-reductases-are-involved-in-the-biosynthesis-of-primary-alcohols-in-aegilops-tauschii-leaves
#5
Meiling Wang, Hongqi Wu, Jing Xu, Chunlian Li, Yong Wang, Zhonghua Wang
The diploid Aegilops tauschii is the D-genome donor to hexaploid wheat (Triticum aestivum) and represents a potential source for genetic study in common wheat. The ubiquitous wax covering the aerial parts of plants plays an important role in protecting plants against non-stomatal water loss. Cuticular waxes are complex mixtures of very-long-chain fatty acids, alkanes, primary and/or secondary alcohols, aldehydes, ketones, esters, triterpenes, sterols, and flavonoids. In the present work, primary alcohols were identified as the major components of leaf cuticular wax in Ae...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28654760/gametocidal-genes-of-aegilops-segregation-distorters-in-wheat-aegilops-wide-hybridization
#6
M Niranjana
Aegilops is a genus belonging to the Poaceace family which have played indispensible role in the evolution of bread wheat and continues to do so by transferring genes by wide hybridization. Being the secondary genepool of wheat, gene transfer from Aegilops poses difficulties and segregation distortion is common. Gametocidal genes are the most well characterized class of segregation distorters reported in interspecific crosses of wheat with Aegilops. These are selfish genetic elements which ensure their preferential transmission to progeny at the cost of gametes lacking them without providing any phenotypic benefits to the plant causing a proportional reduction in fertility...
June 27, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28648886/revisiting-pivotal-differential-genome-evolution-in-wheat
#7
REVIEW
Ghader Mirzaghaderi, Annaliese S Mason
An interesting and possibly unique pattern of genome evolution following polyploidy can be observed among allopolyploids of the Triticum and Aegilops genera (wheat group). Most polyploids in this group are presumed to share a common unaltered (pivotal) subgenome (U, D, or A) together with one or two modified (differential) subgenomes, a status that has been referred to as 'pivotal-differential' genome evolution. In this review we discuss various mechanisms that could be responsible for this evolutionary pattern, as well as evidence for and against the putative evolutionary mechanisms involved...
June 22, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28620398/genome-wide-association-study-of-grain-architecture-in-wild-wheat-aegilops-tauschii
#8
Sanu Arora, Narinder Singh, Satinder Kaur, Navtej S Bains, Cristobal Uauy, Jesse Poland, Parveen Chhuneja
Aegilops tauschii, the D-genome progenitor of Triticum aestivum, encompasses huge diversity for various traits of potential economic importance such as yield, biotic and abiotic stress tolerance, quality and nutrition. In the present study, variation for grain size in Ae. tauschii germplasm was studied and its genetic basis dissected using genome-wide association study (GWAS). Grain length, width, and weight evaluated in 177 Ae. tauschii accessions over 3 years showed near normal distribution with 1.74-, 1...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28597430/identification-of-drought-stress-related-proteins-from-1s-l-1b-chromosome-substitution-line-of-wheat-variety-chinese-spring
#9
Jiaxing Zhou, Chaoying Ma, Shoumin Zhen, Min Cao, Friedich J Zeller, Sai L K Hsam, Yueming Yan
BACKGROUND: Wheat, one of the most important crops, has a detrimental effect on both yield and quality under drought stress. As our preliminary experiment showed that the Chinese Spring wheat-Aegilops longissima chromosome substitution line CS-1S(l) (1B) had a better drought tolerance than CS, the substitution line CS-1S(l)(1B) was used to identify drought stress related proteins by means of a comparative proteome approach in this work. Our present study aimed to explore the gene resources for drought resistance in 1S(l) genome...
December 2016: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28490951/gene-introgression-from-common-wheat-into-aegilops-l
#10
Bo Yuan, Ximin Cao, Aizhi Lv
Group of experiments were carried out to verify possibility of gene introgression from common wheat into Aegilops. The artificial indoor crossbreed was conducted using 7 genotypes from 4 wheat relative species as female, and common wheat as male. The experiment result shows that different species has variable cross ability. Among the 4 Aegilops species, the highest cross rate is from the combination of Aegilops tauschii × Triticum aestivum (46.49% for genotype Ae42, 22.58% for Y92), the second is from Aegilops ovata × T...
May 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28463975/global-gene-expression-profiling-related-to-temperature-sensitive-growth-abnormalities-in-interspecific-crosses-between-tetraploid-wheat-and-aegilops-tauschii
#11
Ryusuke Matsuda, Julio Cesar Masaru Iehisa, Kouhei Sakaguchi, Ryoko Ohno, Kentaro Yoshida, Shigeo Takumi
Triploid wheat hybrids between tetraploid wheat and Aegilops tauschii sometimes show abnormal growth phenotypes, and the growth abnormalities inhibit generation of wheat synthetic hexaploids. In type II necrosis, one of the growth abnormalities, necrotic cell death accompanied by marked growth repression occurs only under low temperature conditions. At normal temperature, the type II necrosis lines show grass-clump dwarfism with no necrotic symptoms, excess tillers, severe dwarfism and delayed flowering. Here, we report comparative expression analyses to elucidate the molecular mechanisms of the temperature-dependent phenotypic plasticity in the triploid wheat hybrids...
2017: PloS One
https://www.readbyqxmd.com/read/28456843/dynamic-nucleolar-activity-in-wheat%C3%A2-%C3%A3-%C3%A2-aegilops-hybrids-evidence-of-c-genome-dominance
#12
Ghader Mirzaghaderi, Zinat Abdolmalaki, Mohsen Zohouri, Zeinab Moradi, Annaliese S Mason
NOR loci of C-subgenome are dominant in wheat × Aegilops interspecific hybrids, which may have evolutionary implications for wheat group genome dynamics and evolution. After interspecific hybridisation, some genes are often expressed from only one of the progenitor species, shaping subsequent allopolyploid genome evolution processes. A well-known example is nucleolar dominance, i.e. the formation of cell nucleoli from chromosomes of only one parental species. We studied nucleolar organizing regions (NORs) in diploid Aegilops markgrafii (syn: Ae...
August 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28428792/identification-of-candidate-genes-and-biosynthesis-pathways-related-to-fertility-conversion-by-wheat-ktm3315a-transcriptome-profiling
#13
Jiali Ye, Yang Duan, Gan Hu, Xingxia Geng, Gaoming Zhang, Pengjiao Yan, Zihan Liu, Lingli Zhang, Xiyue Song
The Aegilops kotschyi thermo-sensitive cytoplasmic male sterility (K-TCMS) system may facilitate hybrid wheat (Triticum aestivum L.) seed multiplication and production. The K-TCMS line is completely male sterile during the normal wheat-growing season, whereas its fertility can be restored in a high-temperature environment. To elucidate the molecular mechanisms responsible for male sterility/fertility conversion and candidate genes involved with pollen development in K-TCMS, we employed RNA-seq to sequence the transcriptomes of anthers from K-TCMS line KTM3315A during development under sterile and fertile conditions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28396677/gametocidal-factor-transferred-from-aegilops-geniculata-roth-can-be-adapted-for-large-scale-chromosome-manipulations-in-cereals
#14
Michał T Kwiatek, Halina Wiśniewska, Aurelia Ślusarkiewicz-Jarzina, Joanna Majka, Maciej Majka, Jolanta Belter, Hanna Pudelska
Segregation distorters are curious, evolutionarily selfish genetic elements, which distort Mendelian segregation in their favor at the expense of others. Those agents include gametocidal factors (Gc), which ensure their preferential transmission by triggering damages in cells lacking them via chromosome break induction. Hence, we hypothesized that the gametocidal system can be adapted for chromosome manipulations between Triticum and Secale chromosomes in hexaploid triticale (×Triticosecale Wittmack). In this work we studied the little-known gametocidal action of a Gc factor located on Aegilops geniculata Roth chromosome 4M(g)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28391694/molecular-characterization-and-variation-of-the-celiac-disease-epitope-domains-among-%C3%AE-gliadin-genes-in-aegilops-tauschii
#15
Yu-Ge Li, Hui-Hui Liang, Sheng-Long Bai, Yun Zhou, Guiling Sun, Ya-Rui Su, An-Li Gao, Da-Le Zhang, Suo-Ping Li
To explore the distribution and quantity of toxic epitopes in α-gliadins from Aegilops tauschii, a total of 133 complete α-gliadin coding sequences were obtained, including 69 pseudogenes with at least one premature stop codon and 64 genes with complete open reading frames (ORFs). Plenty of deletions and single amino acid substitutions were found in the 4 celiac disease (CD) toxic epitope domains through multiple alignments, in which the sequence of DQ2.5-glia-α2 demonstrated the most significant changes...
April 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28384292/molecular-mapping-of-the-grain-iron-and-zinc-concentration-protein-content-and-thousand-kernel-weight-in-wheat-triticum-aestivum-l
#16
Gopalareddy Krishnappa, Anju Mahendru Singh, Swati Chaudhary, Arvind Kumar Ahlawat, Santosh Kumar Singh, Ram Bihari Shukla, Jai Prakash Jaiswal, Gyanendra Pratap Singh, Ishwar Singh Solanki
Genomic regions responsible for accumulation of grain iron concentration (Fe), grain zinc concentration (Zn), grain protein content (PC) and thousand kernel weight (TKW) were investigated in 286 recombinant inbred lines (RILs) derived from a cross between an old Indian wheat variety WH542 and a synthetic derivative (Triticum dicoccon PI94624/Aegilops squarrosa [409]//BCN). RILs were grown in six environments and evaluated for Fe, Zn, PC, and TKW. The population showed the continuous distribution for all the four traits, that for pooled Fe and PC was near normal, whereas, for pooled Zn, RILs exhibited positively skewed distribution...
2017: PloS One
https://www.readbyqxmd.com/read/28364036/genotyping-by-sequencing-facilitates-a-high-density-consensus-linkage-map-for-aegilops-umbellulata-a-wild-relative-of-cultivated-wheat
#17
Erena A Edae, Pablo D Olivera, Yue Jin, Matthew N Rouse
High-density genetic maps are useful to precisely localize QTL or genes that might be used to improve traits of nutritional and/or economical importance in crops. However, high-density genetic maps are lacking for most wild relatives of crop species, including wheat. Aegilops umbellulata is a wild relative of wheat known for its potential as a source of biotic and abiotic stress resistance genes. In this work, we have developed a framework consensus genetic map using two biparental populations derived from accessions PI 298905, PI 542369, PI 5422375, and PI 554395...
May 5, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28351975/long-noncoding-mirna-gene-represses-wheat-%C3%AE-diketone-waxes
#18
Daiqing Huang, J Allan Feurtado, Mark A Smith, Leah K Flatman, Chushin Koh, Adrian J Cutler
The cuticle of terrestrial plants functions as a protective barrier against many biotic and abiotic stresses. In wheat and other Triticeae, β-diketone waxes are major components of the epicuticular layer leading to the bluish-white glaucous trait in reproductive-age plants. Glaucousness in durum wheat is controlled by a metabolic gene cluster at the WAX1 (W1) locus and a dominant suppressor INHIBITOR of WAX1 (Iw1) on chromosome 2B. The wheat D subgenome from progenitor Aegilops tauschii contains W2 and Iw2 paralogs on chromosome 2D...
April 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28286900/physical-mapping-of-dna-markers-linked-to-stem-rust-resistance-gene-sr47-in-durum-wheat
#19
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...
June 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
#20
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...
June 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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