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gene pyramiding in wheat breeding

Meng Lin, Dadong Zhang, Shubing Liu, Guorong Zhang, Jianming Yu, Allan K Fritz, Guihua Bai
BACKGROUND: Pre-harvest sprouting (PHS) in wheat can cause substantial reduction in grain yield and end-use quality. Grain color (GC) together with other components affect PHS resistance. Several quantitative trait loci (QTL) have been reported for PHS resistance, and two of them on chromosome 3AS (TaPHS1) and 4A have been cloned. METHODS: To determine genetic architecture of PHS and GC and genetic relationships of the two traits, a genome-wide association study (GWAS) was conducted by evaluating a panel of 185 U...
October 12, 2016: BMC Genomics
N Ali, Js Pat Heslop-Harrison, H Ahmad, R A Graybosch, G L Hein, T Schwarzacher
Pyramiding of alien-derived Wheat streak mosaic virus (WSMV) resistance and resistance enhancing genes in wheat is a cost-effective and environmentally safe strategy for disease control. PCR-based markers and cytogenetic analysis with genomic in situ hybridisation were applied to identify alien chromatin in four genetically diverse populations of wheat (Triticum aestivum) lines incorporating chromosome segments from Thinopyrum intermedium and Secale cereale (rye). Out of 20 experimental lines, 10 carried Th...
August 2016: Heredity
Quddoos H Muqaddasi, Ulrike Lohwasser, Manuela Nagel, Andreas Börner, Klaus Pillen, Marion S Röder
In a number of crop species hybrids are able to outperform line varieties. The anthers of the autogamous bread wheat plant are normally extruded post anthesis, a trait which is unfavourable for the production of F1 hybrid grain. Higher anther extrusion (AE) promotes cross fertilization for more efficient hybrid seed production. Therefore, this study aimed at the genetic dissection of AE by genome wide association studies (GWAS) and determination of the main effect QTL. We applied GWAS approach to identify DArT markers potentially linked to AE to unfold its genetic basis in a panel of spring wheat accessions...
2016: PloS One
Burkhard Steuernagel, Sambasivam K Periyannan, Inmaculada Hernández-Pinzón, Kamil Witek, Matthew N Rouse, Guotai Yu, Asyraf Hatta, Mick Ayliffe, Harbans Bariana, Jonathan D G Jones, Evans S Lagudah, Brande B H Wulff
Wild relatives of domesticated crop species harbor multiple, diverse, disease resistance (R) genes that could be used to engineer sustainable disease control. However, breeding R genes into crop lines often requires long breeding timelines of 5-15 years to break linkage between R genes and deleterious alleles (linkage drag). Further, when R genes are bred one at a time into crop lines, the protection that they confer is often overcome within a few seasons by pathogen evolution. If several cloned R genes were available, it would be possible to pyramid R genes in a crop, which might provide more durable resistance...
June 2016: Nature Biotechnology
Jun Guo, Xiuli Zhang, Yanlin Hou, Jinjin Cai, Xiaorong Shen, Tingting Zhou, Huihui Xu, Herbert W Ohm, Hongwei Wang, Anfei Li, Fangpu Han, Honggang Wang, Lingrang Kong
Wheat lines with shortened Th. ponticum chromatin carrying Fhb7 and molecular markers linked to Fhb7 will accelerate the transfer of Fhb7 to breeding lines and provide an important resource for future map-based cloning of this gene. Fusarium head blight is a major wheat disease globally. A major FHB resistance gene, designated as Fhb7, derived from Thinopyrum ponticum, was earlier transferred to common wheat, but was not used in wheat breeding due to linkage drag. The aims of this study were to (1) saturate this FHB resistance gene region; (2) develop and characterize secondary translocation lines with shortened Thinopyrum segments carrying Fhb7 using ph1b; (3) pyramid Fhb7 and Fhb1 by marker-assisted selection...
November 2015: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Bin Zhang, Xia Liu, Weina Xu, Jianzhong Chang, Ang Li, Xinguo Mao, Xueyong Zhang, Ruilian Jing
Axillary meristems play an important role in determining final plant architecture and floral structures. Tomato Ls, Arabidopsis LAS and rice MOC1 are orthologous genes regulating axillary meristem initiation and outgrowth. Their functions are generally conserved but the functional specificities are divergent among species. Obvious differences between rice panicles and wheat spikes suggest the divergent functions of MOC1 and its wheat ortholog. We show that TaMOC1 might be involved in wheat spikelet development...
2015: Scientific Reports
Joey C Cainong, William W Bockus, Yigao Feng, Peidu Chen, Lili Qi, Sunish K Sehgal, Tatiana V Danilova, Dal-Hoe Koo, Bernd Friebe, Bikram S Gill
This manuscript describes the transfer and molecular cytogenetic characterization of a novel source of Fusarium head blight resistance in wheat. Fusarium head blight (FHB) caused by the fungus Fusarium graminearum Schwabe [telomorph = Gibberella zeae (Schwein. Fr.) Petch] is an important disease of bread wheat, Triticum aestivum L. (2n = 6x = 42, AABBDD) worldwide. Wheat has limited resistance to FHB controlled by many loci and new sources of resistance are urgently needed. The perennial grass Elymus tsukushiensis thrives in the warm and humid regions of China and Japan and is immune to FHB...
June 2015: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Yuanfeng Hao, Ryan Parks, Christina Cowger, Zhenbang Chen, Yingying Wang, Dan Bland, J Paul Murphy, Mohammed Guedira, Gina Brown-Guedira, Jerry Johnson
A new powdery mildew resistance gene Pm54 was identified on chromosome 6BL in soft red winter wheat. Powdery mildew is causing increasing damage to wheat production in the southeastern USA. To combat the disease, a continuing need exists to discover new genes for powdery mildew resistance and to incorporate those genes into breeding programs. Pioneer(®) variety 26R61 (shortened as 26R61) and AGS 2000 have been used as checks in the Uniform Southern Soft Red Winter Wheat Nursery for a decade, and both have provided good resistance across regions during that time...
March 2015: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Jianmin Zheng, Zehong Yan, Li Zhao, Shizhao Li, Zengyan Zhang, Rosewarne Garry, Wuyun Yang, Zongjun Pu
Stripe rust, a major disease in areas where cool temperatures prevail, can strongly influence grain yield. To control this disease, breeders have incorporated seedling resistance genes from a variety of sources outside the primary wheat gene pool. The wheat line C51, introduced from the International Center for Agricultural Research in the Dry Areas (ICARDA), Syria, confers resistance to all races of Puccinia striiformis f. sp. tritici (PST) in China. To map the resistant gene(s) against stripe rust in wheat line C51, 212 F8 recombinant inbred lines (RILs) derived from the cross X440 x C51 were inoculated with Chinese PST race CYR33 (Chinese yellow rust, CYR) in the greenhouse...
August 2014: Journal of Genetics
X L Zhou, D J Han, X M Chen, H L Gou, S J Guo, L Rong, Q L Wang, L L Huang, Z S Kang
We report a new stripe rust resistance gene on chromosome 7AS in wheat and molecular markers useful for transferring it to other wheat genotypes. Several new races of the stripe rust pathogen have established throughout the wheat growing regions of China in recent years. These new races are virulent to most of the designated seedling resistance genes limiting the resistance sources. It is necessary to identify new genes for diversification and for pyramiding different resistance genes in order to achieve more durable resistance...
November 2014: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Daniel Stirnweis, Samira D Milani, Susanne Brunner, Gerhard Herren, Gabriele Buchmann, David Peditto, Tina Jordan, Beat Keller
The development of high-yielding varieties with broad-spectrum durable disease resistance is the ultimate goal of crop breeding. In plants, immune receptors of the nucleotide-binding-leucine-rich repeat (NB-LRR) class mediate race-specific resistance against pathogen attack. When employed in agriculture this type of resistance is often rapidly overcome by newly adapted pathogen races. The stacking of different resistance genes or alleles in F1 hybrids or in pyramided lines is a promising strategy for achieving more durable resistance...
September 2014: Plant Journal: for Cell and Molecular Biology
Urmil Bansal, Harbans Bariana, Debbie Wong, Mandeep Randhawa, Thomas Wicker, Matthew Hayden, Beat Keller
This article covers detailed characterization and naming of QSr.sun - 5BL as Sr56 . Molecular markers linked with adult plant stem rust resistance gene Sr56 were identified and validated for marker-assisted selection. The identification of new sources of adult plant resistance (APR) and effective combinations of major and minor genes is well appreciated in breeding for durable rust resistance in wheat. A QTL, QSr.sun-5BL, contributed by winter wheat cultivar Arina providing 12-15 % reduction in stem rust severity, was reported in an Arina/Forno recombinant inbred line (RIL) population...
June 2014: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Ting Peng, Xiaochun Sun, Rita H Mumm
Multiple trait integration (MTI) is a multi-step process of converting an elite variety/hybrid for value-added traits (e.g. transgenic events) through backcross breeding. From a breeding standpoint, MTI involves four steps: single event introgression, event pyramiding, trait fixation, and version testing. This study explores the feasibility of marker-aided backcross conversion of a target maize hybrid for 15 transgenic events in the light of the overall goal of MTI of recovering equivalent performance in the finished hybrid conversion along with reliable expression of the value-added traits...
2014: Molecular Breeding: New Strategies in Plant Improvement
Eric L Olson, Matthew N Rouse, Michael O Pumphrey, Robert L Bowden, Bikram S Gill, Jesse A Poland
Aegilops tauschii, the diploid progenitor of the wheat D genome, is a readily accessible germplasm pool for wheat breeding as genes can be transferred to elite wheat cultivars through direct hybridization followed by backcrossing. Gene transfer and genetic mapping can be integrated by developing mapping populations during backcrossing. Using direct crossing, two genes for resistance to the African stem rust fungus race TTKSK (Ug99), were transferred from the Ae. tauschii accessions TA10187 and TA10171 to an elite hard winter wheat line, KS05HW14...
October 2013: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
F Ahmed, M Y Rafii, M R Ismail, A S Juraimi, H A Rahim, R Asfaliza, M A Latif
Submergence or flood is one of the major harmful abiotic stresses in the low-lying countries and crop losses due to waterlogging are considerably high. Plant breeding techniques, conventional or genetic engineering, might be an effective and economic way of developing crops to grow successfully in waterlogged condition. Marker assisted selection (MAS) is a new and more effective approach which can identify genomic regions of crops under stress, which could not be done previously. The discovery of comprehensive molecular linkage maps enables us to do the pyramiding of desirable traits to improve in submergence tolerance through MAS...
2013: BioMed Research International
Yuanfeng Hao, Sue E Cambron, Zhenbang Chen, Yingying Wang, Daniel E Bland, G David Buntin, Jerry W Johnson
The discovery of several new loci for resistance to Hessian fly was reported here. QHf.uga-6AL, the late HR61 was recognized from wheat cultivar 26R61 on the distal end of 6AL with resistance to both biotypes E and vH13. It is the first gene or QTL found on this particular chromosome. QHf.uga-3DL and QHf.uga-1AL, physically assigned to the deletion bins 3DL2-0.27-0.81 and 1AL1-0.17-0.61, respectively, were detected for resistance to biotype vH13. Both QTL should represent new loci for Hessian fly resistance and the latter was detectable only in the late seedling stage when tolerance was evident...
April 2013: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Muhammad Irfaq Khan, Mir Ajab Khan, Abdul Jabbar Khan, Gul Sanat Shah Khattak, Tila Mohammad, Mushtaq Ahmad
Bread wheat (Triticum aestivum L.) germplasm consisting of 45 genotypes were clustered phenotypically using ten morphological traits and Area Under Disease Progress Curve (AUDPC) as measure of stripe rust resistance. The clustering was ratified by using twenty three molecular markers (SSR, EST and STS) linked to stripe rust (Puccinia striiformis f. sp. tritici) resistant QTLs. The aim was to asses the extent of genetic variability among the genotypes in order to select the parents for crossing between the resistant and susceptible genotypes with respect to stripe rust...
November 2011: T︠S︡itologii︠a︡ i Genetika
Seyed Mahmod Tabib Ghaffary, Olivier Robert, Valerie Laurent, Philippe Lonnet, Eric Margalé, Theo A J van der Lee, Richard G F Visser, Gert H J Kema
The ascomycete Mycosphaerella graminicola is the causal agent of septoria tritici blotch (STB), one of the most destructive foliar diseases of bread and durum wheat globally, particularly in temperate humid areas. A screening of the French bread wheat cultivars Apache and Balance with 30 M. graminicola isolates revealed a pattern of resistant responses that suggested the presence of new genes for STB resistance. Quantitative trait loci (QTL) analysis of a doubled haploid (DH) population with five M. graminicola isolates in the seedling stage identified four QTLs on chromosomes 3AS, 1BS, 6DS and 7DS, and occasionally on 7DL...
September 2011: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Annapurnalilly Bipinraj, Balgounda Honrao, Mohinder Prashar, Subhash Bhardwaj, Suryaprakasa Rao, Shubhada Tamhankar
Leaf rust resistance gene Lr28 controls one of the important resistances in the Indian subcontinent against the most prevalent Puccinia triticina pathotype 77-5. Pyramiding Lr28 with other resistance genes would therefore, provide durable resistance against rust, a process that can be facilitated by DNA markers. A microsatellite marker wmc313 linked to Lr28 at a distance of 5.0 cM was identified in the population HD2329 × HW2037. The marker was validated in another population developed from WL711× CS + Lr28: 2D/2M 3/8 (acc...
May 2011: Journal of Applied Genetics
Belayneh Admassu, Dragan Perovic, Wolfgang Friedt, Frank Ordon
Puccinia graminis f. sp. tritici, the causative agent of stem rust in wheat, is known for its high virulence variability and ability to evolve new virulence to resistance genes. Thus, pyramiding of several resistance genes in a single line is the best strategy for a sustainable control of wheat stem rust. Sr13 is one of the few resistance genes that are effective against wide ranging P. graminis f. sp. tritici races, including the pestilent race Ug99. Its effectiveness to Ug99 makes it a valuable source for resistance to stem rust...
February 2011: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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