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wheat breeding and genetics

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https://www.readbyqxmd.com/read/28231525/construction-of-new-est-ssrs-for-fusarium-resistant-wheat-breeding
#1
Aysen Yumurtaci, Hulya Sipahi, Ayed Al-Abdallat, Abdulqader Jighly, Michael Baum
Surveying Fusarium resistance in wheat with easy applicable molecular markers such as simple sequence repeats (SSRs) is a prerequest for molecular breeding. Expressed sequence tags (ESTs) are one of the main sources for development of new SSR candidates. Therefore, 18.292 publicly available wheat ESTs were mined and genotyping of newly developed 55 EST-SSR derived primer pairs produced clear fragments in ten wheat cultivars carrying different levels of Fusarium resistance. Among the proved markers, 23 polymorphic EST-SSRs were obtained and related alleles were mostly found on B and D genome...
February 11, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28231383/the-pangenome-of-hexaploid-bread-wheat
#2
Juan D Montenegro, Agnieszka A Golicz, Philipp E Bayer, Bhavna Hurgobin, HueyTyng Lee, Chon-Kit Kenneth Chan, Paul Visendi, Kaitao Lai, Jaroslav Doležel, Jacqueline Batley, David Edwards
There is an increasing understanding that gene presence absence variation plays an important role in the heritability of agronomic traits, however there have been relatively few studies on gene presence absence variation in crop species. Hexaploid wheat is one of the most important food crops in the world and intensive breeding has reduced the genetic diversity of elite cultivars. Major efforts have produced draft genome assemblies for the cultivar Chinese Spring, but it is unknown how well this represents the genome diversity found in current modern elite cultivars...
February 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28213475/wheat-landrace-genome-diversity
#3
Luzie U Wingen, Claire West, Michelle Leverington-Waite, Sarah Collier, Simon Orford, Richard Goram, Cai-Yun Yang, Julie King, Alexandra M Allen, Amanda Burridge, Keith J Edwards, Simon Griffiths
Understanding the genomic complexity of bread wheat (Triticum aestivum L.) is a cornerstone in the quest to unravel the processes of domestication and the following adaptation of domesticated wheat to a wide variety of environments across the globe. Additionally, it is of importance for future improvement of the crop, particularly in the light of climate change. Focussing on the adaptation after domestication, a nested association mapping (NAM) panel of 60 segregating bi-parental populations were developed mainly involving landrace accessions from the core set of the Watkins hexaploid wheat collection optimized for genetic diversity (WINGEN et al...
February 17, 2017: Genetics
https://www.readbyqxmd.com/read/28181736/high-throughput-mining-of-e-genome-specific-snps-for-characterizing-thinopyrum-elongatum-introgressions-in-common-wheat
#4
Haijuan Lou, Lingli Dong, Kunpu Zhang, Da-Wei Wang, Maolin Zhao, Yiwen Li, Chaowu Rong, Huanju Qin, Aimin Zhang, Zhenying Dong, Daowen Wang
Diploid Thinopyrum elongatum (EE, 2n = 2x = 14) and related polyploid species constitute an important gene pool for improving Triticeae grain and forage crops. However, the genomic and molecular marker resources are generally poor for these species. To aid the genetic, molecular, breeding and ecological studies involving Thinopyrum species, we developed a strategy for mining and validating E-genome specific SNPs using Th. elongatum and common wheat (Triticum aestivum, AABBDD, 2n = 6x = 42) as experimental materials...
February 9, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28163597/development-of-pre-breeding-technology-for-root-system-study-and-selection-of-kihara-afghan-wheat-landraces-kawlr-to-enhance-wheat-breeding-in-the-rain-fed-region
#5
Emdadul Haque, Aziz Ahmad Osmani, Sayed Hasibullah Ahmadi, Tomohiro Ban
To enhance a root trait-based selection program for rain-fed wheat breeding in Afghanistan, we simulated an efficient pre-breeding drought system. Plants were grown in 1 m pipes as control or 2 m pipes to simulate drought conditions soaking ground water up by capillary action supplemented by two different life supporting irrigations from top of the pipes (T1 and T2 droughts). T1 was used for studying genetic diversity in 360 Kihara Afghan wheat landraces (KAWLR). Both drought treatments were used to evaluate root traits in 30 selected genotypes...
December 2016: Breeding Science
https://www.readbyqxmd.com/read/28143400/the-carotenoid-biosynthetic-and-catabolic-genes-in-wheat-and-their-association-with-yellow-pigments
#6
Pasqualina Colasuonno, Maria Luisa Lozito, Ilaria Marcotuli, Domenica Nigro, Angelica Giancaspro, Giacomo Mangini, Pasquale De Vita, Anna Maria Mastrangelo, Nicola Pecchioni, Kelly Houston, Rosanna Simeone, Agata Gadaleta, Antonio Blanco
BACKGROUND: In plants carotenoids play an important role in the photosynthetic process and photo-oxidative protection, and are the substrate for the synthesis of abscisic acid and strigolactones. In addition to their protective role as antioxidants and precursors of vitamin A, in wheat carotenoids are important as they influence the colour (whiteness vs. yellowness) of the grain. Understanding the genetic basis of grain yellow pigments, and identifying associated markers provide the basis for improving wheat quality by molecular breeding...
January 31, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28134278/the-iselect-9%C3%A2-k-snp-analysis-revealed-polyploidization-induced-revolutionary-changes-and-intense-human-selection-causing-strong-haplotype-blocks-in-wheat
#7
Chenyang Hao, Yuquan Wang, Shiaoman Chao, Tian Li, Hongxia Liu, Lanfen Wang, Xueyong Zhang
A Chinese wheat mini core collection was genotyped using the wheat 9 K iSelect SNP array. Total 2420 and 2396 polymorphic SNPs were detected on the A and the B genome chromosomes, which formed 878 haplotype blocks. There were more blocks in the B genome, but the average block size was significantly (P < 0.05) smaller than those in the A genome. Intense selection (domestication and breeding) had a stronger effect on the A than on the B genome chromosomes. Based on the genetic pedigrees, many blocks can be traced back to a well-known Strampelli cross, which was made one century ago...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28099442/a-whole-genome-dartseq-and-snp-analysis-for-genetic-diversity-assessment-in-durum-wheat-from-central-fertile-crescent
#8
Faheem Shehzad Baloch, Ahmad Alsaleh, Muhammad Qasim Shahid, Vahdettin Çiftçi, Luis E Sáenz de Miera, Muhammad Aasim, Muhammad Azhar Nadeem, Husnu Aktaş, Hakan Özkan, Rüştü Hatipoğlu
Until now, little attention has been paid to the geographic distribution and evaluation of genetic diversity of durum wheat from the Central Fertile Crescent (modern-day Turkey and Syria). Turkey and Syria are considered as primary centers of wheat diversity, and thousands of locally adapted wheat landraces are still present in the farmers' small fields. We planned this study to evaluate the genetic diversity of durum wheat landraces from the Central Fertile Crescent by genotyping based on DArTseq and SNP analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28073950/differential-coupling-of-gibberellin-responses-by-rht-b1c-suppressor-alleles-and-rht-b1b-in-wheat-highlights-a-unique-role-for-the-della-n-terminus-in-dormancy
#9
Karel Van De Velde, Peter Michael Chandler, Dominique Van Der Straeten, Antje Rohde
During the Green Revolution, substantial increases in wheat (Triticum aestivum) yields were realized, at least in part, through the introduction of the Reduced height (Rht)-B1b and Rht-D1b semi-dwarfing alleles. In contrast to Rht-B1b and Rht-D1b, the Rht-B1c allele is characterized by extreme dwarfism and exceptionally strong dormancy. Recently, 35 intragenic Rht-B1c suppressor alleles were created in the spring wheat cultivar Maringá, and termed overgrowth (ovg) alleles. Here, 14 ovg alleles with agronomically relevant plant heights were reproducibly classified into nine tall and five semi-dwarf alleles...
January 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28072876/genetic-nature-of-elemental-contents-in-wheat-grains-and-its-genomic-prediction-toward-the-effective-use-of-wheat-landraces-from-afghanistan
#10
Alagu Manickavelu, Tomohiro Hattori, Shuhei Yamaoka, Kazusa Yoshimura, Youichi Kondou, Akio Onogi, Minami Matsui, Hiroyoshi Iwata, Tomohiro Ban
Profiling elemental contents in wheat grains and clarifying the underlying genetic systems are important for the breeding of biofortified crops. Our objective was to evaluate the genetic potential of 269 Afghan wheat landraces for increasing elemental contents in wheat cultivars. The contents of three major (Mg, K, and P) and three minor (Mn, Fe, and Zn) elements in wheat grains were measured by energy dispersive X-ray fluorescence spectrometry. Large variations in elemental contents were observed among landraces...
2017: PloS One
https://www.readbyqxmd.com/read/28055148/genome-wide-association-study-for-13-agronomic-traits-reveals-distribution-of-superior-alleles-in-bread-wheat-from-the-yellow-and-huai-valley-of-china
#11
Congwei Sun, Fuyan Zhang, Xuefang Yan, Xiangfen Zhang, Zhongdong Dong, Dangqun Cui, Feng Chen
Bread wheat is a leading cereal crop worldwide. Limited amount of superior allele loci restricted the progress of molecular improvement in wheat breeding. Here we revealed new allelic variation distribution for 13 yield-related traits in series of genome-wide association studies (GWAS) using the Wheat 90K genotyping assay, characterized in 163 bread wheat cultivars. Agronomic traits were investigated in 14 environments at three locations over three years. After filtering SNP datasets, GWAS using 20,689 high-quality SNPs associated 1,769 significant loci that explained, on average, ~20% of the phenotypic variation, both detected already reported loci and new promising genomic regions...
January 5, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28044314/allelic-variations-and-differential-expressions-detected-at-qtl-loci-for-salt-stress-tolerance-in-wheat
#12
Benedict C Oyiga, Ram C Sharma, Michael Baum, Francis C Ogbonnaya, Jens Léon, Agim Ballvora
The increasing salinization of agricultural lands is a threat to global wheat production. Understanding of the mechanistic basis of salt tolerance (ST) is essential for developing breeding and selection strategies that would allow for increased wheat production under saline conditions to meet the increasing global demand. We used a set of 150 diversity panel genotyped with 90 K SNP Chip and phenotyped for ST across three growth stages and for ionic (leaf K(+) and Na(+) contents) traits to dissect the genetic architecture regulating ST in wheat...
January 3, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28018844/wheat-quality-improvement-at-cimmyt-and-the-use-of-genomic-selection-on-it
#13
REVIEW
Carlos Guzman, Roberto Javier Peña, Ravi Singh, Enrique Autrique, Susanne Dreisigacker, Jose Crossa, Jessica Rutkoski, Jesse Poland, Sarah Battenfield
The International Center for Maize and Wheat Improvement (CIMMYT) leads the Global Wheat Program, whose main objective is to increase the productivity of wheat cropping systems to reduce poverty in developing countries. The priorities of the program are high grain yield, disease resistance, tolerance to abiotic stresses (drought and heat), and desirable quality. The Wheat Chemistry and Quality Laboratory has been continuously evolving to be able to analyze the largest number of samples possible, in the shortest time, at lowest cost, in order to deliver data on diverse quality traits on time to the breeders for making selections for advancement in the breeding pipeline...
December 2016: Applied & Translational Genomics
https://www.readbyqxmd.com/read/28004134/genetic-analysis-and-mapping-of-adult-plant-resistance-loci-to-leaf-rust-in-durum-wheat-cultivar-bairds
#14
Caixia Lan, Bhoja R Basnet, Ravi P Singh, Julio Huerta-Espino, Sybil A Herrera-Foessel, Yong Ren, Mandeep S Randhawa
New leaf rust adult plant resistance (APR) QTL QLr.cim - 6BL was mapped and confirmed the known pleotropic APR gene Lr46 effect on leaf rust in durum wheat line Bairds. CIMMYT-derived durum wheat line Bairds displays an adequate level of adult plant resistance (APR) to leaf rust in Mexican field environments. A recombinant inbred line (RIL) population developed from a cross of Bairds with susceptible parent Atred#1 was phenotyped for leaf rust response at Ciudad Obregon, Mexico, during 2013, 2014, 2015 and 2016 under artificially created epidemics of Puccinia triticina (Pt) race BBG/BP...
December 21, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/27999580/methodology-for-high-throughput-field-phenotyping-of-canopy-temperature-using-airborne-thermography
#15
David M Deery, Greg J Rebetzke, Jose A Jimenez-Berni, Richard A James, Anthony G Condon, William D Bovill, Paul Hutchinson, Jamie Scarrow, Robert Davy, Robert T Furbank
Lower canopy temperature (CT), resulting from increased stomatal conductance, has been associated with increased yield in wheat. Historically, CT has been measured with hand-held infrared thermometers. Using the hand-held CT method on large field trials is problematic, mostly because measurements are confounded by temporal weather changes during the time required to measure all plots. The hand-held CT method is laborious and yet the resulting heritability low, thereby reducing confidence in selection in large scale breeding endeavors...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27995275/genome-wide-mapping-and-prediction-suggests-presence-of-local-epistasis-in-a-vast-elite-winter-wheat-populations-adapted-to-central-europe
#16
Sang He, Jochen C Reif, Viktor Korzun, Reiner Bothe, Erhard Ebmeyer, Yong Jiang
Genome-wide association mapping as well as marker- and haplotype-based genome-wide selection unraveled a complex genetic architecture of grain yield with absence of large effect QTL and presence of local epistatic effects. The genetic architecture of grain yield determines to a large extent the optimum design of genomic-assisted wheat breeding programs. The main goal of our study was to examine the potential and limitations to dissect the genetic architecture of grain yield in wheat using a large experimental data set...
December 19, 2016: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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/27942031/evaluation-of-19-460-wheat-accessions-conserved-in-the-indian-national-genebank-to-identify-new-sources-of-resistance-to-rust-and-spot-blotch-diseases
#18
Sundeep Kumar, Sunil Archak, R K Tyagi, Jagdish Kumar, Vikas Vk, Sherry R Jacob, Kalyani Srinivasan, J Radhamani, R Parimalan, M Sivaswamy, Sandhya Tyagi, Mamata Yadav, Jyotisna Kumari, Deepali, Sandeep Sharma, Indoo Bhagat, Madhu Meeta, N S Bains, A K Chowdhury, B C Saha, P M Bhattacharya, Jyoti Kumari, M C Singh, O P Gangwar, P Prasad, S C Bharadwaj, Robin Gogoi, J B Sharma, Sandeep Kumar Gm, M S Saharan, Manas Bag, Anirban Roy, T V Prasad, R K Sharma, M Dutta, Indu Sharma, K C Bansal
A comprehensive germplasm evaluation study of wheat accessions conserved in the Indian National Genebank was conducted to identify sources of rust and spot blotch resistance. Genebank accessions comprising three species of wheat-Triticum aestivum, T. durum and T. dicoccum were screened sequentially at multiple disease hotspots, during the 2011-14 crop seasons, carrying only resistant accessions to the next step of evaluation. Wheat accessions which were found to be resistant in the field were then assayed for seedling resistance and profiled using molecular markers...
2016: PloS One
https://www.readbyqxmd.com/read/27933261/efficient-regeneration-system-from-rye-leaf-base-segments
#19
Kamil Haliloglu, Murat Aydin
Rye is second only to wheat among grains most widely used in the making of bread and is also a very important gene resource for breeding and improvement of wheat and other cereal crops owing to tolerance to abiotic stress factors such as low temperatures, drought and poor soil conditions. However, application of biotechnologies has been limited in rye breeding since it is one of the most recalcitrant species in tissue culture. A simple and fast regeneration system from leaf-base segment explant of rye was developed in this study...
2016: SpringerPlus
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
#20
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
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