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Junli Zhang, Shiferaw Abate Gizaw, Eligio Bossolini, Joshua Hegarty, Tyson Howell, Arron H Carter, Eduard Akhunov, Jorge Dubcovsky
Chromosome regions affecting grain yield, grain yield components and plant water status were identified and validated in fall-sown spring wheats grown under full and limited irrigation. Increases in wheat production are required to feed a growing human population. To understand the genetic basis of grain yield in fall-sown spring wheats, we performed a genome-wide association study (GWAS) including 262 photoperiod-insensitive spring wheat accessions grown under full and limited irrigation treatments. Analysis of molecular variance showed that 4...
May 16, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Ning Xiao, Yong Gao, Huangjun Qian, Qiang Gao, Yunyu Wu, Dongping Zhang, Zhiping Wang, Xiaoxiang Zhang, Ling Yu, Yuhong Li, Cunhong Pan, Guangqing Liu, Changhai Zhou, Min Jiang, Niansheng Huang, Zhuo Chen, Chengzhi Liang, Zhengyuan Dai, Jianmin Chen, Aihong Li
Cold stress is a major factor limiting rice (Oryza sativa L.) production worldwide, especially at the seedling and booting stages. Identification of genes associated with cold tolerance (CT) in rice is important for sustainable food production. Here, we report the results of a genome-wide association study (GWAS) to identify the genetic loci associated with CT by using a 1,033-accession diversity panel. We identified five CT-related genetic loci at the booting stage. Accessions carrying multiple cold-tolerant alleles displayed a higher seed setting rate than did accessions that had no cold-tolerant alleles or carried a single allele...
May 15, 2018: Plant Physiology
Xinghai Yang, Xiuzhong Xia, Yu Zeng, Baoxuan Nong, Zongqiong Zhang, Yanyan Wu, Faqian Xiong, Yuexiong Zhang, Haifu Liang, Guofu Deng, Danting Li
Rice is an important cereal in the world. The study of the genetic basis of important agronomic traits in rice landraces and identification of genes will facilitate the breed improvement. Gelatinization temperature (GT), gel consistency (GC) and pericarp color (PC) are important indices of rice cooking and eating quality evaluation and potential nutritional importance, which attract wide attentions in the application of genetic and breeding. To dissect the genetic basis of GT, GC and PC, a total of 419 rice landraces core germplasm collections consisting of 330 indica lines, 78 japonica lines and 11 uncertain varieties were planted, collected, then GT, GC, PC were measured for two years, and sequenced using specific-locus amplified fragment sequencing (SLAF-seq) technology...
2018: PloS One
Peter M Bourke, Roeland E Voorrips, Richard G F Visser, Chris Maliepaard
Polyploid organisms carry more than two copies of each chromosome, a condition rarely tolerated in animals but which occurs relatively frequently in the plant kingdom. One of the principal challenges faced by polyploid organisms is to evolve stable meiotic mechanisms to faithfully transmit genetic information to the next generation upon which the study of inheritance is based. In this review we look at the tools available to the research community to better understand polyploid inheritance, many of which have only recently been developed...
2018: Frontiers in Plant Science
Qixiang Zhang, He Zhang, Lidan Sun, Guangyi Fan, Meixia Ye, Libo Jiang, Xin Liu, Kaifeng Ma, Chengcheng Shi, Fei Bao, Rui Guan, Yu Han, Yuanyuan Fu, Huitang Pan, Zhaozhe Chen, Liangwei Li, Jia Wang, Meiqi Lv, Tangchun Zheng, Cunquan Yuan, Yuzhen Zhou, Simon Ming-Yuen Lee, Xiaolan Yan, Xun Xu, Rongling Wu, Wenbin Chen, Tangren Cheng
Mei (Prunus mume) is an ornamental woody plant that has been domesticated in East Asia for thousands of years. High diversity in floral traits, along with its recent genome sequence, makes mei an ideal model system for studying the evolution of woody plants. Here, we investigate the genetic architecture of floral traits in mei and its domestication history by sampling and resequencing a total of 351 samples including 348 mei accessions and three other Prunus species at an average sequencing depth of 19.3×...
April 27, 2018: Nature Communications
Zitong Li, Petri Kemppainen, Pasi Rastas, Juha Merilä
Genome-wide association studies (GWAS) aim to identify genetic markers strongly associated with quantitative traits by utilizing linkage disequilibrium (LD) between candidate genes and markers. However, because of LD between nearby genetic markers, the standard GWAS approaches typically detect a number of correlated SNPs covering long genomic regions, making corrections for multiple testing overly conservative. Additionally, the high dimensionality of modern GWAS data poses considerable challenges for GWAS procedures such as permutation tests, which are computationally intensive...
April 19, 2018: Molecular Ecology Resources
Haijiao Dong, Hu Zhao, Shuangle Li, Zhongmin Han, Gang Hu, Chang Liu, Gaiyu Yang, Gongwei Wang, Weibo Xie, Yongzhong Xing
As a major component of ideal plant architecture, leaf angle especially flag leaf angle (FLA) makes a large contribution to grain yield in rice. We utilized a worldwide germplasm collection to elucidate the genetic basis of FLA that would be helpful for molecular design breeding in rice. Genome-wide association studies (GWAS) identified a total of 40 and 32 QTLs for FLA in Wuhan and Hainan, respectively. Eight QTLs were commonly detected in both conditions. Of these, 2 and 3 QTLs were identified in the indica and japonica subpopulations, respectively...
April 4, 2018: PLoS Genetics
Yan Zhao, Weipeng Zhao, Conghui Jiang, Xiaoning Wang, Huaiyang Xiong, Elena G Todorovska, Zhigang Yin, Yanfa Chen, Xin Wang, Jianyin Xie, Yinghua Pan, Muhammad A R Rashid, Hongliang Zhang, Jinjie Li, Zichao Li
Dry direct-seeding of rice is rapidly increasing in China, but variable planting depth associated with machine sowing can lead to low seedling emergence rates. Phenotype analysis of 621 rice accessions showed that mesocotyl length (ML) was induced by deep soil covering and was important in deep-sowing tolerance in the field. Here, we performed and compared GWAS using three types of SNPs (non-synonymous SNP, non-synonymous SNPs and SNPs within promoters and 3 million randomly selected SNPs from the entire set of SNPs) and found that Non-Syn GWAS (GWAS using non-synonyomous SNP) decreased computation time and eliminated confounding by other loci relative to GWAS using randomly selected SNPs...
2018: Frontiers in Plant Science
Zilong Guo, Wanneng Yang, Yu Chang, Xiaosong Ma, Haifu Tu, Fang Xiong, Ni Jiang, Hui Feng, Chenglong Huang, Peng Yang, Hu Zhao, Guoxing Chen, Hongyan Liu, Lijun Luo, Honghong Hu, Qian Liu, Lizhong Xiong
Understanding how plants respond to drought can benefit drought resistance (DR) breeding. Using a non-destructive phenotyping facility, 51 image-based traits (i-traits) for 507 rice accessions were extracted. These i-traits can be used to monitor drought responses, and evaluate DR. They have high heritability and large variation of drought responses in the natural population. A genome-wide association study (GWAS) of the i-traits and traditional DR traits identified 470 association loci containing some known DR-related genes...
March 31, 2018: Molecular Plant
Philomin Juliana, Ravi P Singh, Pawan K Singh, Jesse A Poland, Gary C Bergstrom, Julio Huerta-Espino, Sridhar Bhavani, Jose Crossa, Mark E Sorrells
Genome-wide association mapping in conjunction with population sequencing map and Ensembl plants was used to identify markers/candidate genes linked to leaf rust, stripe rust and tan spot resistance in wheat. Leaf rust (LR), stripe rust (YR) and tan spot (TS) are some of the important foliar diseases in wheat (Triticum aestivum L.). To identify candidate resistance genes for these diseases in CIMMYT's (International Maize and Wheat Improvement Center) International bread wheat screening nurseries, we used genome-wide association studies (GWAS) in conjunction with information from the population sequencing map and Ensembl plants...
March 27, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Ci-Tao Liu, Wei Wang, Bi-Gang Mao, Cheng-Cai Chu
Low temperature is a major factor affecting rice geographical distribution growth, development, and productivity. Cold stress mediates a series of physiological and metabolite changes, such as alterations in chlorophyll fluorescence, electrolyte leakage, reactive oxygen species (ROS), malondialdehyde (MAD), sucrose, lipid peroxides, proline, and other metabolites, plant endogenous hormones abscisic acid (ABA) and gibberellin (GA) also changes. In this review, we summarize the recent research progress on physiological and metabolic changes under low temperature, cold stress related loci and QTL reported by map-based cloning and genome-wide association analysis (GWAS), and some molecular mechanisms in response to low temperature in rice...
March 20, 2018: Yi Chuan, Hereditas
Zixiang Wen, Ruijuan Tan, Shichen Zhang, Paul J Collins, Jiazheng Yuan, Wenyan Du, Cuihua Gu, Shujun Ou, Qijian Song, Yong-Qiang Charles An, John F Boyse, Martin I Chilvers, Dechun Wang
White mould of soya bean, caused by Sclerotinia sclerotiorum (Lib.) de Bary, is a necrotrophic fungus capable of infecting a wide range of plants. To dissect the genetic architecture of resistance to white mould, a high-density customized single nucleotide polymorphism (SNP) array (52 041 SNPs) was used to genotype two soya bean diversity panels. Combined with resistance variation data observed in the field and greenhouse environments, genome-wide association studies (GWASs) were conducted to identify quantitative trait loci (QTL) controlling resistance against white mould...
March 12, 2018: Plant Biotechnology Journal
Yongle Li, Pradeep Ruperao, Jacqueline Batley, David Edwards, Tanveer Khan, Timothy D Colmer, Jiayin Pang, Kadambot H M Siddique, Tim Sutton
Drought tolerance is a complex trait that involves numerous genes. Identifying key causal genes or linked molecular markers can facilitate the fast development of drought tolerant varieties. Using a whole-genome resequencing approach, we sequenced 132 chickpea varieties and advanced breeding lines and found more than 144,000 single nucleotide polymorphisms (SNPs). We measured 13 yield and yield-related traits in three drought-prone environments of Western Australia. The genotypic effects were significant for all traits, and many traits showed highly significant correlations, ranging from 0...
2018: Frontiers in Plant Science
Khaled M Hazzouri, Basel Khraiwesh, Khaled M A Amiri, Duke Pauli, Tom Blake, Mohammad Shahid, Sangeeta K Mullath, David Nelson, Alain L Mansour, Kourosh Salehi-Ashtiani, Michael Purugganan, Khaled Masmoudi
Sodium (Na+ ) accumulation in the cytosol will result in ion homeostasis imbalance and toxicity of transpiring leaves. Studies of salinity tolerance in the diploid wheat ancestor Triticum monococcum showed that HKT1;5 -like gene was a major gene in the QTL for salt tolerance, named Nax2 . In the present study, we were interested in investigating the molecular mechanisms underpinning the role of the HKT1;5 gene in salt tolerance in barley ( Hordeum vulgare ). A USDA mini-core collection of 2,671 barley lines, part of a field trial was screened for salinity tolerance, and a Genome Wide Association Study (GWAS) was performed...
2018: Frontiers in Plant Science
Francois Laurens, Maria José Aranzana, Pere Arus, Daniele Bassi, Marco Bink, Joan Bonany, Andrea Caprera, Luca Corelli-Grappadelli, Evelyne Costes, Charles-Eric Durel, Jehan-Baptiste Mauroux, Hélène Muranty, Nelson Nazzicari, Thierry Pascal, Andrea Patocchi, Andreas Peil, Bénédicte Quilot-Turion, Laura Rossini, Alessandra Stella, Michela Troggio, Riccardo Velasco, Eric van de Weg
Despite the availability of whole genome sequences of apple and peach, there has been a considerable gap between genomics and breeding. To bridge the gap, the European Union funded the FruitBreedomics project (March 2011 to August 2015) involving 28 research institutes and private companies. Three complementary approaches were pursued: (i) tool and software development, (ii) deciphering genetic control of main horticultural traits taking into account allelic diversity and (iii) developing plant materials, tools and methodologies for breeders...
2018: Horticulture Research
Junji Su, Libei Li, Chi Zhang, Caixiang Wang, Lijiao Gu, Hantao Wang, Hengling Wei, Qibao Liu, Long Huang, Shuxun Yu
Thirty significant associations between 22 SNPs and five plant architecture component traits in Chinese upland cotton were identified via GWAS. Four peak SNP loci located on chromosome D03 were simultaneously associated with more plant architecture component traits. A candidate gene, Gh_D03G0922, might be responsible for plant height in upland cotton. A compact plant architecture is increasingly required for mechanized harvesting processes in China. Therefore, cotton plant architecture is an important trait, and its components, such as plant height, fruit branch length and fruit branch angle, affect the suitability of a cultivar for mechanized harvesting...
June 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Peter S Kristensen, Ahmed Jahoor, Jeppe R Andersen, Fabio Cericola, Jihad Orabi, Luc L Janss, Just Jensen
The aim of the this study was to identify SNP markers associated with five important wheat quality traits (grain protein content, Zeleny sedimentation, test weight, thousand-kernel weight, and falling number), and to investigate the predictive abilities of GBLUP and Bayesian Power Lasso models for genomic prediction of these traits. In total, 635 winter wheat lines from two breeding cycles in the Danish plant breeding company Nordic Seed A/S were phenotyped for the quality traits and genotyped for 10,802 SNPs...
2018: Frontiers in Plant Science
Asis Shrestha, Ambrose Kwaku Dziwornu, Yoshiaki Ueda, Lin-Bo Wu, Boby Mathew, Michael Frei
Manganese (Mn) is an essential micro-nutrient for plants, but flooded rice fields can accumulate high levels of Mn2+ leading to Mn toxicity. Here, we present a genome-wide association study (GWAS) to identify candidate loci conferring Mn toxicity tolerance in rice (Oryza sativa L.). A diversity panel of 288 genotypes was grown in hydroponic solutions in a greenhouse under optimal and toxic Mn concentrations. We applied a Mn toxicity treatment (5 ppm Mn2+, 3 weeks) at twelve days after transplanting. Mn toxicity caused moderate damage in rice in terms of biomass loss and symptom formation despite extremely high shoot Mn concentrations ranging from 2...
2018: PloS One
Ana M Bossa-Castro, Cheick Tekete, Chitra Raghavan, Emily E Delorean, Alexis Dereeper, Karim Dagno, Ousmane Koita, Gloria Mosquera, Hei Leung, Valérie Verdier, Jan E Leach
Quantitative trait loci (QTL) that confer broad-spectrum resistance (BSR), or resistance that is effective against multiple and diverse plant pathogens, have been elusive targets of crop breeding programmes. Multiparent advanced generation intercross (MAGIC) populations, with their diverse genetic composition and high levels of recombination, are potential resources for the identification of QTL for BSR. In this study, a rice MAGIC population was used to map QTL conferring BSR to two major rice diseases, bacterial leaf streak (BLS) and bacterial blight (BB), caused by Xanthomonas oryzae pathovars (pv...
February 6, 2018: Plant Biotechnology Journal
Weiwei Wen, Min Jin, Kun Li, Haijun Liu, Yingjie Xiao, Mingchao Zhao, Saleh Alseekh, Wenqiang Li, Francisco de Abreu E Lima, Yariv Brotman, Lothar Willmitzer, Alisdair R Fernie, Jianbing Yan
Primary metabolism plays a pivotal role in normal plant growth, development and reproduction. As maize is a major crop worldwide, the primary metabolites produced by maize plants are of immense importance from both calorific and nutritional perspectives. Here a genome-wide association study (GWAS) of 61 primary metabolites using a maize association panel containing 513 inbred lines identified 153 significant loci associated with the level of these metabolites in four independent tissues. The genome-wide expression level of 760 genes was also linked with metabolite levels within the same tissue...
March 2018: Plant Journal: for Cell and Molecular Biology
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