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TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik

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https://www.readbyqxmd.com/read/28730464/genome-wide-association-mapping-of-canopy-wilting-in-diverse-soybean-genotypes
#1
Avjinder S Kaler, Jeffery D Ray, William T Schapaugh, C Andy King, Larry C Purcell
Genome-wide association analysis identified 61 SNP markers for canopy wilting, which likely tagged 51 different loci. Based on the allelic effects of the significant SNPs, the slowest and fastest wilting genotypes were identified. Drought stress is a major global constraint for crop production, and slow canopy wilting is a promising trait for improving drought tolerance. The objective of this study was to identify genetic loci associated with canopy wilting and to confirm those loci with previously reported canopy wilting QTLs...
July 20, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28730463/exploring-new-alleles-for-frost-tolerance-in-winter-rye
#2
Wiltrud Erath, Eva Bauer, D Brian Fowler, Andres Gordillo, Viktor Korzun, Mira Ponomareva, Malthe Schmidt, Brigitta Schmiedchen, Peer Wilde, Chris-Carolin Schön
Rye genetic resources provide a valuable source of new alleles for the improvement of frost tolerance in rye breeding programs. Frost tolerance is a must-have trait for winter cereal production in northern and continental cropping areas. Genetic resources should harbor promising alleles for the improvement of frost tolerance of winter rye elite lines. For frost tolerance breeding, the identification of quantitative trait loci (QTL) and the choice of optimum genome-based selection methods are essential. We identified genomic regions involved in frost tolerance of winter rye by QTL mapping in a biparental population derived from a highly frost tolerant selection from the Canadian cultivar Puma and the European elite line Lo157...
July 20, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28725946/validation-and-characterization-of-a-qtl-for-adult-plant-resistance-to-stripe-rust-on-wheat-chromosome-arm-6bs-yr78
#3
Zhenzhen Dong, Joshua M Hegarty, Junli Zhang, Wenjun Zhang, Shiaoman Chao, Xianming Chen, Yonghong Zhou, Jorge Dubcovsky
This study validated one QTL for adult plant resistance to stripe rust, identified donor lines of the resistance allele, and demonstrated that it is different from previously named Yr genes. The spread of more virulent and aggressive races of Puccinia striiformis f. sp. tritici (Pst, causal pathogen of stripe rust) after the year 2000 has caused substantial yield losses worldwide. To find new sources of resistance, we previously performed a genome-wide association study and identified a strong QTL for adult plant resistance on the short arm of chromosome 6B (QYr...
July 19, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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
#4
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/28710504/mapping-novel-aphid-resistance-qtl-from-wild-soybean-glycine-soja-85-32
#5
Shichen Zhang, Zhongnan Zhang, Carmille Bales, Cuihua Gu, Chris DiFonzo, Ming Li, Qijian Song, Perry Cregan, Zhenyu Yang, Dechun Wang
Two novel QTLs conferring aphid resistance were mapped and validated on soybean chromosomes 8 and 16, respectively. Closely linked markers were developed to assist breeding for aphid resistance. Soybean aphid, Aphis glycines Matsumura, is a highly destructive pest for soybean production. E08934, a soybean advanced breeding line derived from the wild soybean Glycine soja 85-32, has shown strong resistance to aphids. To dissect the genetic basis of aphid resistance in E08934, a mapping population (070020) consisting of 140 F3-derived lines was developed by crossing E08934 with an aphid-susceptible line E00003...
July 14, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28707250/genomic-prediction-of-starch-content-and-chipping-quality-in-tetraploid-potato-using-genotyping-by-sequencing
#6
Elsa Sverrisdóttir, Stephen Byrne, Ea Høegh Riis Sundmark, Heidi Øllegaard Johnsen, Hanne Grethe Kirk, Torben Asp, Luc Janss, Kåre L Nielsen
Genomic prediction models for starch content and chipping quality show promising results, suggesting that genomic selection is a feasible breeding strategy in tetraploid potato. Genomic selection uses genome-wide molecular markers to predict performance of individuals and allows selections in the absence of direct phenotyping. It is regarded as a useful tool to accelerate genetic gain in breeding programs, and is becoming increasingly viable for crops as genotyping costs continue to fall. In this study, we have generated genomic prediction models for starch content and chipping quality in tetraploid potato to facilitate varietal development...
July 13, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28707249/qtl-associated-with-resistance-to-cassava-brown-streak-and-cassava-mosaic-diseases-in-a-bi-parental-cross-of-two-tanzanian-farmer-varieties-namikonga-and-albert
#7
E A Masumba, F Kapinga, G Mkamilo, K Salum, H Kulembeka, S Rounsley, J V Bredeson, J B Lyons, D S Rokhsar, E Kanju, M S Katari, A A Myburg, N A van der Merwe, M E Ferguson
QTL consistent across seasons were detected for resistance to cassava brown streak disease induced root necrosis and foliar symptoms. The CMD2 locus was detected in an East African landrace, and comprised two QTL. Cassava production in Africa is compromised by cassava brown streak disease (CBSD) and cassava mosaic disease (CMD). To reduce costs and increase the precision of resistance breeding, a QTL study was conducted to identify molecular markers linked to resistance against these diseases. A bi-parental F1 mapping population was developed from a cross between the Tanzanian farmer varieties, Namikonga and Albert...
July 13, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28702690/molecular-mapping-and-candidate-gene-analysis-of-a-new-epicuticular-wax-locus-in-sorghum-sorghum-bicolor-l-moench
#8
G Anurag Uttam, M Praveen, Y Venkateswara Rao, Vilas A Tonapi, R Madhusudhana
A new epicuticular wax (bloom) locus has been identified and fine mapped to the 207.89 kb genomic region on chromosome 1. A putative candidate gene, Sobic.001G269200, annotated as GDSL-like lipase/acylhydrolase, is proposed as the most probable candidate gene involved in bloom synthesis/deposition. Deposition of epicuticular wax on plant aerial surface is one strategy that plants adapt to reduce non-transpiration water loss. Epicuticular wax (bloom)-less mutants in sorghum with their glossy phenotypes exhibit changes in the accumulation of epicuticular wax on leaf and culm surfaces...
July 12, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28656363/cytogenetic-mapping-of-a-major-locus-for-resistance-to-fusarium-head-blight-and-crown-rot-of-wheat-on-thinopyrum-elongatum-7el-and-its-pyramiding-with-valuable-genes-from-a-th-ponticum-homoeologous-arm-onto-bread-wheat-7dl
#9
Carla Ceoloni, Paola Forte, Ljiljana Kuzmanović, Silvio Tundo, Ilaria Moscetti, Pasquale De Vita, Maria Elena Virili, Renato D'Ovidio
A major locus for resistance to different Fusarium diseases was mapped to the most distal end of Th. elongatum 7EL and pyramided with Th. ponticum beneficial genes onto wheat 7DL. Perennial Triticeae species of the Thinopyrum genus are among the richest sources of valuable genes/QTL for wheat improvement. One notable and yet unexploited attribute is the exceptionally effective resistance to a major wheat disease worldwide, Fusarium head blight, associated with the long arm of Thinopyrum elongatum chromosome 7E (7EL)...
June 27, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28653151/identification-of-quantitative-trait-loci-associated-with-resistance-to-net-form-net-blotch-in-a-collection-of-nordic-barley-germplasm
#10
Ronja Wonneberger, Andrea Ficke, Morten Lillemo
Association mapping of resistance to Pyrenophora teres f. teres in a collection of Nordic barley germplasm at different developmental stages revealed 13 quantitative loci with mostly small effects. Net blotch, caused by the necrotrophic fungus Pyrenophora teres, is one of the major diseases in barley in Norway causing quantitative and qualitative yield losses. Resistance in Norwegian cultivars and germplasm is generally insufficient and resistance sources have not been extensively explored yet. In this study, we mapped quantitative trait loci (QTL) associated with resistance to net blotch in Nordic germplasm...
June 26, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28653150/linkage-map-construction-and-qtl-analysis-for-internal-heat-necrosis-in-autotetraploid-potato
#11
Mitchell J Schumann, Zhao-Bang Zeng, Mark E Clough, G Craig Yencho
A tetraploid potato population was mapped for internal heat necrosis (IHN) using the Infinium (®) 8303 potato SNP array, and QTL for IHN were identified on chromosomes 1, 5, 9 and 12 that explained 28.21% of the variation for incidence and 25.3% of the variation for severity. This research represents a significant step forward in our understanding of IHN, and sets the stage for future research focused on testing the utility of these markers in additional breeding populations. Internal heat necrosis (IHN) is a significant non-pathogenic disorder of potato tubers and previous studies have identified AFLP markers linked to IHN susceptibility in the tetraploid, B2721 potato mapping population...
June 26, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28653149/development-and-comparative-genomic-mapping-of-dasypyrum-villosum-6v-4s-specific-pcr-markers-using-transcriptome-data
#12
Shijin Li, Zhishan Lin, Chang Liu, Ke Wang, Lipu Du, Xingguo Ye
Twenty-five Dasypyrum villosum 6V#4S-specific PCR markers were developed using transcriptome data and further assigned to comparative genomic maps of wheat chromosome 6A, 6B, and 6D and barley chromosome 6H contrasting their homologous genes in these genomes. Two Dasypyrum villosum accessions, D.v#2 and No. 1026 from England and Russia, respectively, contain Pm21 on chromosome 6V#2S and PmV on chromosome 6V#4S. Both genes confer high resistance to powdery mildew (PM) in wheat. Even though several molecular markers have been developed to detect Pm21 and PmV, only the MBH1 marker can simultaneously detect both Pm21 and PmV...
June 26, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28647896/omics-based-hybrid-prediction-in-maize
#13
Matthias Westhues, Tobias A Schrag, Claas Heuer, Georg Thaller, H Friedrich Utz, Wolfgang Schipprack, Alexander Thiemann, Felix Seifert, Anita Ehret, Armin Schlereth, Mark Stitt, Zoran Nikoloski, Lothar Willmitzer, Chris C Schön, Stefan Scholten, Albrecht E Melchinger
Complementing genomic data with other "omics" predictors can increase the probability of success for predicting the best hybrid combinations using complex agronomic traits. Accurate prediction of traits with complex genetic architecture is crucial for selecting superior candidates in animal and plant breeding and for guiding decisions in personalized medicine. Whole-genome prediction has revolutionized these areas but has inherent limitations in incorporating intricate epistatic interactions. Downstream "omics" data are expected to integrate interactions within and between different biological strata and provide the opportunity to improve trait prediction...
June 24, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28647895/systematic-design-for-trait-introgression-projects
#14
John N Cameron, Ye Han, Lizhi Wang, William D Beavis
Using an Operations Research approach, we demonstrate design of optimal trait introgression projects with respect to competing objectives. We demonstrate an innovative approach for designing Trait Introgression (TI) projects based on optimization principles from Operations Research. If the designs of TI projects are based on clear and measurable objectives, they can be translated into mathematical models with decision variables and constraints that can be translated into Pareto optimality plots associated with any arbitrary selection strategy...
June 24, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28634809/genetic-and-transcriptomic-analyses-of-lignin-and-lodging-related-traits-in-brassica-napus
#15
Lijuan Wei, Hongju Jian, Kun Lu, Nengwen Yin, Jia Wang, Xiujian Duan, Wei Li, Liezhao Liu, Xinfu Xu, Rui Wang, Andrew H Paterson, Jiana Li
Candidate genes associated with lignin and lodging traits were identified by combining phenotypic, genotypic, and gene expression data in B. napus. Brassica napus is one of the world's most important oilseed crops, but its yield can be dramatically reduced by lodging, bending, and falling of its vertical stems. Lignin has been shown to contribute to stem mechanical strength. In this study, we found that the syringyl/guaiacyl (S/G) monolignol ratio exhibits a significant negative correlation with disease and lodging resistance...
June 20, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28634808/mapping-of-genetic-locus-for-leaf-trichome-in-brassica-oleracea
#16
Jiaqin Mei, Jinhua Wang, Yuehua Li, Shuai Tian, Dayong Wei, Chaoguo Shao, Jun Si, Qing Xiong, Jiana Li, Wei Qian
The genetic locus for leaf trichome was identified via marker-based mapping and SNP microarray assay, and a functional marker was developed to facilitate the breeding for hairiness in Brassica oleracea. Plant trichomes are involved in various functions particularly in protecting plants against some biotic and abiotic damages. In the present study, an F2 segregating population was developed from the cross between a glabrous cultivated B. oleracea (CC, 2n = 18) and a hairy wild relative, B. incana (CC, 2n = 18)...
June 20, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28624908/development-and-validation-of-kasp-markers-for-the-greenbug-resistance-gene-gb7-and-the-hessian-fly-resistance-gene-h32-in-wheat
#17
Chor-Tee Tan, Hangjin Yu, Yan Yang, Xiangyang Xu, Mingshun Chen, Jackie C Rudd, Qingwu Xue, Amir M H Ibrahim, Lisa Garza, Shichen Wang, Mark E Sorrells, Shuyu Liu
Greenbug and Hessian fly are important pests that decrease wheat production worldwide. We developed and validated breeder-friendly KASP markers for marker-assisted breeding to increase selection efficiency. Greenbug (Schizaphis graminum Rondani) and Hessian fly [Mayetiola destructor (Say)] are two major destructive insect pests of wheat (Triticum aestivum L.) throughout wheat production regions in the USA and worldwide. Greenbug and Hessian fly infestation can significantly reduce grain yield and quality. Breeding for resistance to these two pests using marker-assisted selection (MAS) is the most economical strategy to minimize losses...
June 17, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28623548/genetic-dissection-for-zinc-deficiency-tolerance-in-rice-using-bi-parental-mapping-and-association-analysis
#18
Jae-Sung Lee, Andres Godwin C Sajise, Glenn B Gregorio, Tobias Kretzschmar, Abdelbagi M Ismail, Matthias Wissuwa
Zinc deficiency is a widespread soil constraint in rice production. Here, we present QTL/candidate genes associated with Zn deficiency tolerance identified through bi-parental QTL mapping and genome-wide association analysis. Zinc (Zn) deficiency is a widespread soil constraint in rice production. Despite several physiological studies elucidating Zn deficiency tolerance mechanisms, little is known about genetic factors conferring tolerance. To identify QTL associated with root development, biomass accumulation, and grain yield under Zn deficiency, we combined bi-parental QTL mapping in a population of 200 backcross inbred (BC1F6) lines and genome-wide association analysis using 247 k SNP markers across 140 accessions of an indica diversity panel...
June 16, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28608227/bimodality-of-stable-and-plastic-traits-in-plants
#19
Josef Fisher, Elad Bensal, Dani Zamir
We discovered an unexpected mode of bimodal distribution of stable and plastic traits, which was consistent for homologous traits of 32 varieties of seven species both in well-irrigated fields and dry conditions. We challenged archived genetic mapping data for 36 fruit, seed, flower and yield traits in tomato and found an unexpected bimodal distribution in one measure of trait variability, the mean coefficient of variation, with some traits being consistently more variable than others. To determine the degree of conservation of this distribution among higher plants, we compared 18 homologous phenotypes, including yield and seed production, across different crop species grown in a common 'crop garden' experiment...
June 12, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28593327/qtl-mapping-of-root-traits-in-phosphorus-deficient-soils-reveals-important-genomic-regions-for-improving-ndvi-and-grain-yield-in-barley
#20
Xue Gong, Glenn McDonald
Major QTLs for root rhizosheath size are not correlated with grain yield or yield response to phosphorus. Important QTLs were found to improve phosphorus efficiency. Root traits are important for phosphorus (P) acquisition, but they are often difficult to characterize and their breeding values are seldom assessed under field conditions. This has shed doubts on using seedling-based criteria of root traits to select and breed for P efficiency. Eight root traits were assessed under controlled conditions in a barley doubled-haploid population in soils differing in P levels...
June 7, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
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