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https://www.readbyqxmd.com/read/29143815/genome-sequence-of-the-progenitor-of-the-wheat-d-genome-aegilops-tauschii
#1
Ming-Cheng Luo, Yong Q Gu, Daniela Puiu, Hao Wang, Sven O Twardziok, Karin R Deal, Naxin Huo, Tingting Zhu, Le Wang, Yi Wang, Patrick E McGuire, Shuyang Liu, Hai Long, Ramesh K Ramasamy, Juan C Rodriguez, Sonny L Van, Luxia Yuan, Zhenzhong Wang, Zhiqiang Xia, Lichan Xiao, Olin D Anderson, Shuhong Ouyang, Yong Liang, Aleksey V Zimin, Geo Pertea, Peng Qi, Jeffrey L Bennetzen, Xiongtao Dai, Matthew W Dawson, Hans-Georg Müller, Karl Kugler, Lorena Rivarola-Duarte, Manuel Spannagl, Klaus F X Mayer, Fu-Hao Lu, Michael W Bevan, Philippe Leroy, Pingchuan Li, Frank M You, Qixin Sun, Zhiyong Liu, Eric Lyons, Thomas Wicker, Steven L Salzberg, Katrien M Devos, Jan Dvořák
Aegilops tauschii is the diploid progenitor of the D genome of hexaploid wheat (Triticum aestivum, genomes AABBDD) and an important genetic resource for wheat. The large size and highly repetitive nature of the Ae. tauschii genome has until now precluded the development of a reference-quality genome sequence. Here we use an array of advanced technologies, including ordered-clone genome sequencing, whole-genome shotgun sequencing, and BioNano optical genome mapping, to generate a reference-quality genome sequence for Ae...
November 15, 2017: Nature
https://www.readbyqxmd.com/read/29125785/cytogenetic-analysis-and-mapping-of-leaf-rust-resistance-in-aegilops-speltoides-tausch-derived-bread-wheat-line-selection2427-carrying-putative-gametocidal-gene-s
#2
M Niranjana, Vinod, J B Sharma, Niharika Mallick, S M S Tomar, S K Jha
Leaf rust (Puccinia triticina) is a major biotic stress affecting wheat yields worldwide. Host-plant resistance is the best method for controlling leaf rust. Aegilops speltoides is a good source of resistance against wheat rusts. To date, five Lr genes, Lr28, Lr35, Lr36, Lr47, and Lr51, have been transferred from Ae. speltoides to bread wheat. In Selection2427, a bread wheat introgresed line with Ae. speltoides as the donor parent, a dominant gene for leaf rust resistance was mapped to the long arm of chromosome 3B (LrS2427)...
August 25, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/29116063/-myc-gene-family-in-cereals-transformations-during-evolution-of-hexaploid-bread-wheat-and-its-relatives
#3
K V Strygina, E K Khlestkina
The transcription factors of the MYC gene family are an integral part of the MYB + MYC + WD40 regulatory complex required to activate the genes of plant flavonoid biosynthesis. The TaMyc1 gene, which controls the synthesis of flavonoid pigments in the grain pericarp, is known in bread wheat (Triticum aestivum L., BBAADD genome, 2n = 6x = 42). In the present work, we identified 10 copies of this gene in the T. aestivum genome, 22 copies in the nearest bread wheat relatives (T. durum, T. urartu, T. monococcum, Aegilops speltoides, Ae...
September 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/29104581/a-high-density-genetic-map-of-wild-emmer-wheat-from-the-karaca-da%C3%A4-region-provides-new-evidence-on-the-structure-and-evolution-of-wheat-chromosomes
#4
Chad Jorgensen, Ming-Cheng Luo, Ramesh Ramasamy, Mathew Dawson, Bikram S Gill, Abraham B Korol, Assaf Distelfeld, Jan Dvorak
Wild emmer (Triticum turgidum ssp. dicoccoides) is a progenitor of all cultivated wheat grown today. It has been hypothesized that emmer was domesticated in the Karaca Dağ region in southeastern Turkey. A total of 445 recombinant inbred lines of T. turgidum ssp. durum cv. 'Langdon' x wild emmer accession PI 428082 from this region was developed and genotyped with the Illumina 90K single nucleotide polymorphism Infinium assay. A genetic map comprising 2,650 segregating markers was constructed. The order of the segregating markers and an additional 8,264 co-segregating markers in the Aegilops tauschii reference genome sequence was used to compare synteny of the tetraploid wheat with the Brachypodium distachyon, rice, and sorghum...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29101627/genetic-mapping-reveals-a-dominant-awn-inhibiting-gene-related-to-differentiation-of-the-variety-anathera-in-the-wild-diploid-wheat-aegilops-tauschii
#5
Ryo Nishijima, Tatsuya M Ikeda, Shigeo Takumi
Aegilops tauschii, a wild wheat relative, is the D-genome donor of common wheat. Subspecies and varieties of Ae. tauschii are traditionally classified based on differences in their inflorescence architecture. However, the genetic information for their diversification has been quite limited in the wild wheat relatives. The variety anathera has no awn on the lemma, but the genetic basis for this diagnostic character is unknown. Wide variations in awn length traits at the top and middle spikes were found in the Ae...
November 3, 2017: Genetica
https://www.readbyqxmd.com/read/29099990/transfer-of-a-starch-phenotype-from-wild-wheat-to-bread-wheat-by-deletion-of-a-locus-controlling-b-type-starch-granule-content
#6
Tansy Chia, Nikolai M Adamski, Benedetta Saccomanno, Andy Greenland, Alastair Nash, Cristobal Uauy, Kay Trafford
Our previous genetic analysis of a tetraploid wild wheat species, Aegilops peregrina, predicted that a single gene per haploid genome, Bgc-1, controls B-type starch granule content in the grain. To test whether bread wheat (Triticum aestivum L.) has orthologous Bgc-1 loci, we screened a population of γ-irradiated bread wheat cv. Paragon for deletions of the group 4 chromosomes spanning Bgc-1. Suitable deletions, each encompassing ~600-700 genes, were discovered for chromosomes 4A and 4D. These two deletions are predicted to have 240 homoeologous genes in common...
November 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29094182/molecular-cytogenetic-and-genomic-analyses-reveal-new-insights-into-the-origin-of-the-wheat-b-genome
#7
Wei Zhang, Mingyi Zhang, Xianwen Zhu, Yaping Cao, Qing Sun, Guojia Ma, Shiaoman Chao, Changhui Yan, Steven S Xu, Xiwen Cai
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 speltoides (genome SS) has been controversially considered a possible candidate for the donor of the wheat B genome. However, the relationship of the Ae...
November 1, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/29090430/hybrid-incompatibilities-in-interspecific-crosses-between-tetraploid-wheat-and-its-wild-diploid-relative-aegilops-umbellulata
#8
Moeko Okada, Kentaro Yoshida, Shigeo Takumi
Hybrid abnormalities, severe growth abortion and grass-clump dwarfism, were found in the tetraploid wheat/Aegilops umbellulata hybrids, and the gene expression changes were conserved in the hybrids with those in other wheat synthetic hexaploids. Aegilops umbellulata Zhuk., a diploid goatgrass species with a UU genome, has been utilized as a genetic resource for wheat breeding. Here, we examine the reproductive barriers between tetraploid wheat cultivar Langdon (Ldn) and various Ae. umbellulata accessions by conducting interspecific crossings...
October 31, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/29075275/agronomic-traits-and-molecular-marker-identification-of-wheat-aegilops-caudata-addition-lines
#9
Wenping Gong, Ran Han, Haosheng Li, Jianmin Song, Hongfei Yan, Genying Li, Aifeng Liu, Xinyou Cao, Jun Guo, Shengnan Zhai, Dungong Cheng, Zhendong Zhao, Cheng Liu, Jianjun Liu
Aegilops caudata is an important gene source for wheat breeding. Intensive evaluation of its utilization value is an essential first step prior to its application in breeding. In this research, the agronomical and quality traits of Triticum aestivum-Ae. caudata additions B-G (homoeologous groups not identified) were analyzed and evaluated. Disease resistance tests showed that chromosome D of Ae. caudata might possess leaf rust resistance, and chromosome E might carry stem rust and powdery mildew resistance genes...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29069494/the-first-near-complete-assembly-of-the-hexaploid-bread-wheat-genome-triticum-aestivum
#10
Aleksey V Zimin, Daniela Puiu, Richard Hall, Sarah Kingan, Bernardo J Clavijo, Steven L Salzberg
Common bread wheat, Triticum aestivum , has one of the most complex genomes known to science, with 6 copies of each chromosome, enormous numbers of near-identical sequences scattered throughout, and an overall haploid size of more than 15 billion bases. Multiple past attempts to assemble the genome have produced assemblies that were well short of the estimated genome size. Here we report the first near-complete assembly of T. aestivum , using deep sequencing coverage from a combination of short Illumina reads and very long Pacific Biosciences reads...
October 23, 2017: GigaScience
https://www.readbyqxmd.com/read/29030762/genetic-diversity-of-avenin-like-b-genes-in-aegilops-tauschii-coss
#11
Dong Cao, Hongxia Wang, Bo Zhang, Baolong Liu, Dengcai Liu, Wenjie Chen, Huaigang Zhang
Avenin-like storage proteins influence the rheological properties and processing quality in common wheat, and the discovery of new alleles will benefit wheat quality improvement. In this study, 13 avenin-like b alleles (TaALPb7D-A-M) were discovered in 108 Aegilops tauschii Coss. accessions. Ten alleles were reported for the first time, while the remaining three alleles were the same as alleles in other species. A total of 15 nucleotide changes were detected in the 13 alleles, resulting in only 11 amino acid changes because of synonymous mutations...
October 13, 2017: Genetica
https://www.readbyqxmd.com/read/29024189/intron-length-polymorphism-of-%C3%AE-tubulin-genes-of-aegilops-biuncialis-vis
#12
Anastasiia Rabokon, Andrii Demkovych, Alexei Sozinov, Natalia Kozub, Igor Sozinov, Yaroslav Pirko, Yaroslav Blume
Intron-specific DNA polymorphism is present amongplant β-tubulin gene family members and is considered to be one of the molecular markers based on thedifference of tubulin introns length assayed both separately (TBP: 1(st) intron) or in combination (h-TBP: 1(st) and 2(nd) introns). These two approaches arepossibly useful for wheat breeding programs, since TBP and h-TBP help to differentiate between the accessions of Aegilops biuncialis Vis., a wild relative of wheat. PCR-derived polymorphic fragments were resolved by PAGE electrophoresis...
October 10, 2017: Cell Biology International
https://www.readbyqxmd.com/read/29016604/novel-fine-scale-aerial-mapping-approach-quantifies-grassland-weed-cover-dynamics-and-response-to-management
#13
Carolyn M Malmstrom, H Scott Butterfield, Laura Planck, Christopher W Long, Valerie T Eviner
Invasive weeds threaten the biodiversity and forage productivity of grasslands worldwide. However, management of these weeds is constrained by the practical difficulty of detecting small-scale infestations across large landscapes and by limits in understanding of landscape-scale invasion dynamics, including mechanisms that enable patches to expand, contract, or remain stable. While high-end hyperspectral remote sensing systems can effectively map vegetation cover, these systems are currently too costly and limited in availability for most land managers...
2017: PloS One
https://www.readbyqxmd.com/read/28960410/low-molecular-weight-glutenin-subunits-from-the-1u-genome-of-aegilops-umbellulata-confer-superior-dough-rheological-properties-and-improve-breadmaking-quality-of-bread-wheat
#14
Jian Wang, Chang Wang, Shoumin Zhen, Xiaohui Li, Yueming Yan
BACKGROUND: Wheat-related genomes may carry new glutenin genes with the potential for quality improvement of breadmaking. In this study, we estimated the gluten quality properties of the wheat line CNU609 derived from crossing between Chinese Spring (CS, Triticum aestivum L., 2n = 6x = 42, AABBDD) and the wheat-Aegilops umbellulata (2n = 2x = 14, UU) 1U(1B) substitution line, and investigated the function of 1U-encoded low molecular weight glutenin subunits (LMW-GS). RESULTS: The main quality parameters of CNU609 were significantly improved due to introgression of the 1U genome, including dough development time, stability time, farinograph quality number, gluten index, loaf size and inner structure...
September 27, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28947704/molecular-cloning-and-functional-characterization-of-two-novel-high-molecular-weight-glutenin-subunit-genes-in-aegilops-markgrafii
#15
Xuye Du, Xiaocun Zhang
The high molecular weight glutenin subunits (HMW-GS) in bread wheat are major determinants of the viscoelastic properties of dough and the end-use quality of wheat flour. Two novel HMW-GSs, 1Cx1.1 and 1Cy9.1, from the diploid species Aegilops markgrafii (CC) were identified in the present study. The corresponding open-reading frames of the genes of 1Cx1.1 and 1Cy9.1 were isolated and sequenced using allele-specific polymerase chain reaction. Sequence comparison demonstrated that the HMW-GSs from Ae. markgrafii possess a similar primary structure to the homologous proteins in wheat and related species...
September 2017: Journal of Genetics
https://www.readbyqxmd.com/read/28932231/addition-of-aegilops-u-and-m-chromosomes-affects-protein-and-dietary-fiber-content-of-wholemeal-wheat-flour
#16
Marianna Rakszegi, István Molnár, Alison Lovegrove, Éva Darkó, András Farkas, László Láng, Zoltán Bedő, Jaroslav Doležel, Márta Molnár-Láng, Peter Shewry
Cereal grain fiber is an important health-promoting component in the human diet. One option to improve dietary fiber content and composition in wheat is to introduce genes from its wild relatives Aegilops biuncialis and Aegilops geniculata. This study showed that the addition of chromosomes 2U(g), 4U(g), 5U(g), 7U(g), 2M(g), 5M(g), and 7M(g) of Ae. geniculata and 3U(b), 2M(b), 3M(b), and 7M(b) of Ae. biuncialis into bread wheat increased the seed protein content. Chromosomes 1U(g) and 1M(g) increased the proportion of polymeric glutenin proteins, while the addition of chromosomes 1U(b) and 6U(b) led to its decrease...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28918554/genome-wide-identification-classification-evolutionary-analysis-and-gene-expression-patterns-of-the-protein-kinase-gene-family-in-wheat-and-aegilops-tauschii
#17
Jun Yan, Peisen Su, Zhaoran Wei, Eviatar Nevo, Lingrang Kong
In this study we systematically identified and classified PKs in Triticum aestivum, Triticum urartu and Aegilops tauschii. Domain distribution and exon-intron structure analyses of PKs were performed, and we found conserved exon-intron structures within the exon phases in the kinase domain. Collinearity events were determined, and we identified various T. aestivum PKs from polyploidizations and tandem duplication events. Global expression pattern analysis of T. aestivum PKs revealed that some PKs might participate in the signaling pathways of stress response and developmental processes...
October 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28887628/development-of-a-set-of-pcr-markers-specific-to-aegilops-longissima-chromosome-arms-and-application-in-breeding-a-translocation-line
#18
Kunyang Wang, Zhishan Lin, Long Wang, Ke Wang, Qinghua Shi, Lipu Du, Xingguo Ye
Transcriptome data were used to develop 134 Aegilops longissima specific PCR markers and their comparative maps were constructed by contrasting with the homologous genes in the wheat B genome. Three wheat- Ae. longissima 1BL·1S (l) S translocation lines were identified using the correspondence markers. Aegilops longissima is an important wild species of common wheat that harbors many genes that can be used to improve various traits of common wheat (Triticum aestivum L.). To efficiently transfer the traits conferred by these Ae...
September 8, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28857322/new-insights-into-structural-organization-and-gene-duplication-in-a-1-75-mb-genomic-region-harboring-the-%C3%AE-gliadin-gene-family-in-aegilops-tauschii-the-source-of-wheat-d-genome
#19
Naxin Huo, Lingli Dong, Shengli Zhang, Yi Wang, Tingting Zhu, Toni Mohr, Susan Altenbach, Zhiyong Liu, Jan Dvorak, Olin D Anderson, Ming-Cheng Luo, Daowen Wang, Yong Q Gu
Among the wheat prolamins important for its end-use traits, α-gliadins are the most abundant, and are also a major cause of food-related allergies and intolerances. Previous studies of various wheat species estimated that between 25 and 150 α-gliadin genes reside in the Gli-2 locus regions. To better understand the evolution of this complex gene family, the DNA sequence of a 1.75-Mb genomic region spanning the Gli-2 locus was analyzed in the diploid grass, Aegilops tauschii, the ancestral source of D genome in hexaploid bread wheat...
August 30, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28835997/chromosomes-1bs-and-1rs-for-control-of-male-fertility-in-wheats-and-triticales-with-cytoplasms-of-aegilops-kotschyi-ae-mutica-and-ae-uniaristata
#20
Adam J Lukaszewski
Engineered chromosomes 1BS and 1RS offer a new alternative in the development of hybrid systems in bread wheat and triticale. In the cytoplasmic male sterility system for hybrid wheat based on the cytoplasm of Triticum timopheevi fertility restoration is difficult, with few good restorer genes available. In the system based on the cytoplasms of Aegilops kotschyi, Ae. uniaristata and Ae. mutica, essentially all chromosomes 1B carry locus Rf (multi) that restores male fertility; male sterility manifests itself in wheats with the 1RS...
December 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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