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wheat QTL

Gizaw M Wolde, Corinna Trautewig, Martin Mascher, Thorsten Schnurbusch
Modifying morphometric inflorescence traits is important for increasing grain yield in wheat. Mapping revealed nine QTL, including new QTL and a new allele for the q locus, controlling wheat spike morphometric traits. To identify loci controlling spike morphometric traits, namely spike length (SL), internode length (IL), node number per spike (NPS), and node density (ND), we studied 146 Recombinant Inbred Lines of tetraploid wheat (Triticum turgidum L.) derived from standard spike and spike-branching mutant parents...
February 14, 2019: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Juan J Gutierrez-Gonzalez, Martin Mascher, Jesse Poland, Gary J Muehlbauer
Wheat (Triticum aestivum) genetic maps are a key enabling tool for genetic studies. We used genotyping-by-sequencing-(GBS) derived markers to map recombinant inbred line (RIL) and doubled haploid (DH) populations from crosses of W7984 by Opata, and used the maps to explore features of recombination control. The RIL and DH populations, SynOpRIL and SynOpDH, were composed of 906 and 92 individuals, respectively. Two high-density genetic linkage framework maps were constructed of 2,842 and 2,961 cM, harboring 3,634 and 6,580 markers, respectively...
February 11, 2019: Scientific Reports
Melissa Garcia, Paul Eckermann, Stephan Haefele, Sanjiv Satija, Beata Sznajder, Andy Timmins, Ute Baumann, Petra Wolters, Diane E Mather, Delphine Fleury
Wheat landraces, wild relatives and other 'exotic' accessions are important sources of new favorable alleles. The use of those exotic alleles is facilitated by having access to information on the association of specific genomic regions with desirable traits. Here, we conducted a genome-wide association study (GWAS) using a wheat panel that includes landraces, synthetic hexaploids and other exotic wheat accessions to identify loci that contribute to increases in grain yield in southern Australia. The 568 accessions were grown in the field during the 2014 and 2015 seasons and measured for plant height, maturity, spike length, spike number, grain yield, plant biomass, HI and TGW...
2019: PloS One
Qingdong Zeng, Jianhui Wu, Shengjie Liu, Shuo Huang, Qilin Wang, Jingmei Mu, Shizhou Yu, Dejun Han, Zhensheng Kang
Co-localization of a major QTL for wheat stripe rust resistance to a 3.9-cM interval on chromosome 6BL across both populations and another QTL on chromosome 2B with epistatic interaction. Cultivars with diverse resistance are the optimal strategy to minimize yield losses caused by wheat stripe rust (Puccinia striiformis f. sp. tritici). Two wheat populations involving resistant wheat lines P10078 and Snb"S" from CIMMYT were evaluated for stripe rust response in multiple environments. Pool analysis by Wheat660K SNP array showed that the overlapping interval on chromosome 6B likely harbored a major QTL between two populations...
February 1, 2019: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Yuki Sakai, Liangzi Cao, Ryosuke Funata, Takatou Shiraishi, Koki Yoshikawa, Kohei Maeno, Hideho Miura, Kazumitsu Onishi
Spelt wheat ( Triticum aestivum subsp. spelta ), a subspecies of common wheat, is a genetic resource for the breeding of bread wheat ( T. aestivum subsp. aestivum ); however, genetic analyses of agronomic traits in bread wheat × spelt crosses are insufficient. Here, we conducted QTL analysis in the recombinant inbred lines from a bread wheat × spelt cross. In addition to the major Q locus, QSpd.obu-4D was detected with the spelt allele conferring a higher spikelet density than the bread wheat allele. The effect of QSpd...
December 2018: Breeding Science
Jian Ma, Nana Qin, Ben Cai, Guoyue Chen, Puyang Ding, Han Zhang, Congcong Yang, Lin Huang, Yang Mu, Huaping Tang, Yaxi Liu, Jirui Wang, Pengfei Qi, Qiantao Jiang, Youliang Zheng, Chunji Liu, Xiujin Lan, Yuming Wei
A major, likely novel stripe rust resistance QTL for all-stage resistance on chromosome arm 1BL identified in a 1.76-cM interval using a saturated linkage map was validated in four populations with different genetic backgrounds. Stripe rust is a globally important disease of wheat. Identification and utilization of new resistance genes are essential for breeding resistant cultivars. Wheat line 20828 has exhibited high levels of stripe rust resistance for over a decade. However, the genetics of stripe rust resistance in this line has not been studied...
January 24, 2019: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
L J Ponce-Molina, J Huerta-Espino, R P Singh, B R Basnet, G Alvarado, M S Randhawa, C X Lan, V H Aguilar-Rincón, R Lobato-Ortiz, J J García-Zavala
Since 1984, the 'Chilero' spring wheat line developed by CIMMYT has proven to be highly resistant to leaf rust and stripe rust. Amid efforts to understand the basis of resistance of this line, a recombinant inbred line (RIL) population derived from a cross between Avocet and Chilero was studied. The parents and RILs were characterized in field trials for leaf rust and stripe rust in three locations in Mexico between 2012 and 2015 and genotyped with DArT-array, DArT-GBS, and SSR markers. A total of 6,168 polymorphic markers were used to construct genetic linkage maps...
February 2018: Plant Disease
Jiale Xu, Xiongtao Dai, Ramesh K Ramasamy, Le Wang, Tingting Zhu, Patrick E McGuire, Chad M Jorgensen, Hamid Dehghani, Patrick J Gulick, Ming-Cheng Luo, Hans-Georg Müller, Jan Dvorak
Numerous quantitative trait loci (QTLs) have been mapped in tetraploid and hexaploid wheat and wheat relatives, mostly with simple sequence repeat (SSR) or single nucleotide polymorphism (SNP) markers. To conduct meta-analysis of QTLs requires projecting them onto a common genomic framework, either a consensus genetic map or genomic sequence. The latter strategy is pursued here. Of 774 QTLs mapped in wheat and wheat relatives found in the literature, 585 (75.6%) were successfully projected onto the Aegilops tauschii pseudomolecules...
January 22, 2019: G3: Genes—Genomes—Genetics
Qingdong Zeng, Jianhui Wu, Shengjie Liu, Xianming Chen, Fengping Yuan, Pingping Su, Qilin Wang, Shuo Huang, Jingmei Mu, Dejun Han, Zhensheng Kang, X M Chen
Stripe rust caused by Puccinia striiformis f. sp. tritici threatens worldwide wheat production. Growing resistant cultivars is the best way to control this disease. Chinese wheat cultivar Qinnong 142 (QN142) has a high level of adult-plant resistance to stripe rust. To identify quantitative trait loci (QTLs) related to stripe rust resistance, we developed a recombinant inbred line (RIL) population from a cross between QN142 and susceptible cultivar Avocet S. The parents and 165 F6 RILs were evaluated in terms of their stripe rust infection type and disease severity in replicated field tests with six site-year environments...
January 15, 2019: Plant Disease
Shuo Huang, Jianhui Wu, Xiaoting Wang, Jingmei Mu, Zhi Xu, Qingdong Zeng, Shengjie Liu, Qilin Wang, Zhensheng Kang, Dejun Han
Breeding for resistance to stripe rust (caused by Puccinis striiformis f. sp. tritici) is essential for reducing losses in yield and quality in wheat. To identify genes for use in breeding, a biparental population of 186 recombinant inbred lines (RILs) from a cross of the Chinese landrace Mingxian 169 and CIMMYT-derived line P9936 was evaluated in field nurseries either artificially or naturally inoculated in two crop seasons. Each of the RILs and parents was genotyped with the Wheat55K single nucleotide polymorphism (SNP) 'Breeders' array and a genetic linkage map with 8,225 polymorphic SNP markers spanning 3,593...
January 15, 2019: Phytopathology
Ben Ward, Chris Brien, Helena Oakey, Allison Pearson, Sónia Negrão, Rhiannon K Schilling, Julian Taylor, David Jarvis, Andy Timmins, Stuart J Roy, Mark Tester, Bettina Berger, Anton van den Hengel
To optimize shoot growth and structure of cereals, we need to understand the genetic components controlling initiation and elongation. While measuring total shoot growth at high-throughput using 2D imaging has progressed, recovering the 3D shoot structure of small grain cereals at a large scale is still challenging. Here, we present a method for measuring defined individual leaves of cereals, such as wheat and barley, using few images. Plant shoot modelling over time was used to measure the initiation and elongation of leaves in a bi-parental barley mapping population under low and high soil salinity...
January 2, 2019: Plant Journal: for Cell and Molecular Biology
D Nigro, A Gadaleta, G Mangini, P Colasuonno, I Marcotuli, A Giancaspro, S L Giove, R Simeone, A Blanco
Stable QTL for grain protein content co-migrating with nitrogen-related genes have been identified by the candidate genes and genome-wide association mapping approaches useful for marker-assisted selection. Grain protein content (GPC) is one of the most important quality traits in wheat, defining the nutritional and end-use properties and rheological characteristics. Over the years, a number of breeding programs have been developed aimed to improving GPC, most of them having been prevented by the negative correlation with grain yield...
January 2, 2019: Planta
Yosef Gebrehawaryat Kidane, Cherinet Alem Gesesse, Bogale Nigir Hailemariam, Ermias Abate, Dejene Kassahun Mengistu, Carlo Fadda, Mario Enrico Pè, Matteo Dell'Acqua
The Ethiopian plateau hosts thousands of durum wheat (Triticum turgidum subsp. durum) farmer varieties (FV) with high adaptability and breeding potential. To harness their unique allelic diversity, we produced a large nested association mapping (NAM) population intercrossing fifty Ethiopian FVs with an international elite durum wheat variety (Asassa). The Ethiopian NAM population (EtNAM) is composed of fifty interconnected bi-parental families, totaling 6,280 recombinant inbred lines (RILs) that represent both a powerful quantitative trait loci (QTL) mapping tool, and a large pre-breeding panel...
December 21, 2018: Plant Biotechnology Journal
Heike Lehnert, Albrecht Serfling, Wolfgang Friedt, Frank Ordon
In the majority of wheat growing areas worldwide, the incidence of drought stress has increased significantly resulting in a negative impact on plant development and grain yield. Arbuscular mycorrhizal symbiosis is known to improve drought stress tolerance of wheat. However, quantitative trait loci (QTL) involved in the response to drought stress conditions in the presence of mycorrhizae are largely unknown. Therefore, a diverse set consisting of 94 bread wheat genotypes was phenotyped under drought stress and well watered conditions in the presence and absence of mycorrhizae...
2018: Frontiers in Plant Science
Raz Avni, Leah Oren, Gai Shabtay, Siwar Assili, Curtis Pozniak, Iago Hale, Roi Ben-David, Zvi Peleg, Assaf Distelfeld
The domestication and subsequent genetic improvement of wheat led to the development of large-seeded cultivated wheat species relative to their smaller-seeded wild progenitors. While increased grain weight (GW) continues to be an important goal of many wheat breeding programs, few genes underlying this trait have been identified despite an abundance of studies reporting quantitative trait loci (QTL) for GW. Here we perform a QTL analysis for GW using a population of recombinant inbred lines (RILs) derived from the cross between wild emmer wheat accession 'Zavitan' and durum wheat variety 'Svevo'...
December 17, 2018: Genes
Pawan Kumar Singh, Xinyao He, Carolina Paola Sansaloni, Philomin Juliana, Susanne Dreisigacker, Etienne Duveiller, Uttam Kumar, Arun Kumar Joshi, Ravi Prakash Singh
Spot blotch (SB) is an important fungal disease of wheat in South Asia and South America. Host resistance is regarded as an economical and environmentally friendly approach of controlling SB, and the inheritance of resistance is mostly quantitative. In order to gain a better understanding on the SB resistance mechanism in CIMMYT germplasm, two bi-parental mapping populations were generated, both comprising 232 F2:7 progenies. Elite CIMMYT breeding lines, BARTAI and WUYA, were used as resistant parents, whereas CIANO T79 was used as susceptible parent in both populations...
December 14, 2018: International Journal of Molecular Sciences
Cathérine Pauline Herter, Erhard Ebmeyer, Sonja Kollers, Viktor Korzun, Tobias Würschum, Thomas Miedaner
Genomic selection is an approach that uses whole-genome marker data to predict breeding values of genotypes and holds the potential to improve the genetic gain in breeding programs. In this study, two winter wheat populations (DS1 and DS2) consisting of 438 and 585 lines derived from six and eight bi-parental families, respectively, were genotyped with genome-wide single nucleotide polymorphism markers and phenotyped for Fusarium head blight and Septoria tritici blotch severity, plant height and heading date...
December 14, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Rudy Dolferus, Saravanan Thavamanikumar, Harriet Sangma, Sue Kleven, Xiaomei Wallace, Kerrie Forrest, Gregory Rebetzke, Matthew Hayden, Lauren Borg, Alison Smith, Brian Cullis
Water stress during reproductive growth is a major yield constraint for wheat ( Triticum aestivum L). We previously established a controlled environment drought tolerance phenotyping method targeting the young microspore stage of pollen development. This method eliminates stress avoidance based on flowering time. We substituted soil drought treatments by a reproducible osmotic stress treatment using hydroponics and NaCl as osmolyte. Salt exclusion in hexaploid wheat avoids salt toxicity, causing osmotic stress...
December 12, 2018: G3: Genes—Genomes—Genetics
Barbara Steiner, Sebastian Michel, Marco Maccaferri, Marc Lemmens, Roberto Tuberosa, Hermann Buerstmayr
Genomic selection had a higher selection response for FHB resistance than phenotypic selection, while association mapping identified major QTL on chromosome 3B unaffected by plant height and flowering date. Fusarium head blight (FHB) is one of the most destructive diseases of durum wheat. Hence, minimizing losses in yield, quality and avoiding contamination with mycotoxins are of pivotal importance, as durum wheat is mostly used for human consumption. While growing resistant varieties is the most promising approach for controlling this fungal disease, FHB resistance breeding in durum wheat is hampered by the limited variation in the elite gene pool and difficulties in efficiently combining the numerous small-effect resistance quantitative trait loci (QTL) in the same line...
December 1, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Wessam Akel, Matthias Rapp, Patrick Thorwarth, Tobias Würschum, C Friedrich H Longin
Hybrid durum has a promising yield potential coupled with good quality, but the efficiency of hybrid seed production must be improved. Hybrid breeding is a tremendous success story in many crops, but has not yet made a breakthrough in wheat, mainly due to inefficient hybrid seed production. In this study, we investigated the heterosis for grain yield and important quality traits in durum wheat of 33 hybrids built up from 24 parental lines, as well as the variation in anther extrusion and its genetic architecture in a vast collection of Central European elite durum lines...
November 29, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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