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Integrated linkage mapping and genome-wide association study to dissect the genetic basis of zinc deficiency tolerance in maize at seedling stage

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The Crop Journal 2022年第6期10卷 1807-1818页

作者： Jianqin Xu Zhongfu Ni fanjun chen Xiuyi Fu Futong Yu Key Laboratory of Plant-Soil Interaction(MOE) Centre for ResourcesEnvironment and Food SecurityCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China State Key Laboratory for Agrobiotechnology Key Laboratory of Crop Heterosis and Utilization(MOE)Beijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China National Maize Improvement Center of China Beijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China

Zinc(Zn)deficiency is the most widespread micronutrient deficiency,affecting yield and quality of crops *** genes associated with Zn-deficiency tolerance in maize is a basis for elucidating its genetic mechanism.A K22×CI7 recombinant inbred population consisting of 210 lines and an association panel of 508 lines were used to identify genetic loci influencing Zn-deficiency ***-Zn and-Zn/CK conditions,15 quantitative trait loci(QTL)were detected,each explaining 5.7%-12.6%of phenotypic ***-one significant single-nucleotide polymorphisms(SNPs)were identified at P<10^(-5)by genome-wide association study(GWAS),accounting for 5%-14%of phenotypic *** respectively 198 and 183 candidate genes identified within the QTL regions and the 100-kb regions flanking these significant SNPs,12 were associated with Zn-deficiency *** these candidate genes,four genes associated with hormone signaling in response to Zn-deficiency stress were co-localized with QTL or SNPs,including the genes involved in the auxin(ZmARF7),and ethylene(ZmETR5,ZmESR14,and ZmEIN2)signaling *** candidate genes were identified as being responsible for Zn transport,including ZmNAS3 detected by GWAS,ZmVIT and ZmYSL11 detected by QTL *** of ZmYSL11 was up-regulated in Zn-deficient *** candidate genes that displayed different expression patterns in response to Zn deficiency were detected in the regions overlapping peak GWAS signals,and the haplotypes for each candidate gene were further analyzed.

关键词： Maize(Zea mays L.) Quantitative trait loci(QTL) Genome-wide association study(GWAS) Zinc(Zn)deficiency tolerance Candidate genes

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THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS AND ALLOWABLE DEFECT ASSESSMENT OF THE CENTRIFUGE BOWL BODY

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Transactions of Nonferrous Metals Society of China 1996年第1期6卷 141-146页

作者： Xu Zhenxing chen fanjun Wang Zhaoqi Xu Yan Liu Yaodong chen Yijun Mechanical Engineering Department Xiangtan UniversityXiangtan 411105 Shanghai Branch of 701 Research Institute of General Co.of Shipping Industry of China Xiangtan Centrifuge Plant

For the first time,an allowable defect analysis of the bowl body of XZZ 1200-G Centrifuge was made by using fatigue fracture mechanics method;and,again for the first time,the design fatigue curve of the dangerous sect... 详细信息

关键词： bowl body of centrifuge fatigue fracture mechanics method crack

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Root growth in response to nitrogen supply in Chinese maize hybrids released between 1973 and 2009

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Science China(Life Sciences) 2011年第7期54卷 642-650页

作者： WU QiuPing chen fanjun chen YanLing YUAN LiXing ZHANG FuSuo MI GuoHua Key Laboratory of Plant-Soil Interaction MOE College of Resources and Environmental Science China Agricultural University Beijing 100193 China

Root growth has a fundamental role in nitrogen （N） use efficiency. Nevertheless, little is known about how modem breeding progress has affected root growth and its responses to N supply. The root and shoot growth of a core set of 11 representative Chinese maize （Zea mays L.） hybrids released between 1973 and 2009 were investigated under high N （4 mmol L^-1, HN） and low N （0.04 mmol L^-1, LN） levels in a solution culture system. Compared with LN, HN treatment decreased root dry weight （RDW）, the root： shoot ratio （R/S）, and the relative growth rate for root dry weight （RGRroot）, but increased the total root length （TRL） and the total lateral root length （LRL）. The total axial root length （ARL） per plant was reduced under HN, mostly in hybrids released before the 1990s. The number of seminal roots （SRN） was largely unaffected by different N levels. More recently released hybrids showed higher relative growth rates in the shoot under both HN and LN. However, the roots only showed increased RGR under HN treatment. Correspondingly, there was a positive linear relationship with the year of hybrid release for TRL, LRL and ARL under HN treatment. Together, these results suggest that while shoot growth of maize has improved, its root growth has only improved under high N conditions over the last 36 years of selective breeding in China. Improving root growth under LN conditions may be necessary to increase the N use efficiency of maize.

关键词： Root R/S ratio nitrogen relative growth rate maize breeding

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QTL mapping and transcriptome analysis identify candidate genes influencing water–nitrogen interaction in maize

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The Crop Journal 2023年第6期11卷 1872-1883页

作者： Kunhui He Yakun Zhang Wei Ren Pengyun chen Jianchao Liu Guohua Mi fanjun chen Qingchun Pan State Key Laboratory of Nutrient Use and Management College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China College of Agronomy Northwest A&F UniversityYangling 712100ShaanxiChina Sanya Institute of China Agricultural University Sanya 572000HainanChina

Water and nitrogen fertilization are the key factors limiting maize *** genetic basis of interactions between maize genotype,water,and nitrogen is unclear.A recombinant inbred line(RIL)maize population was evaluated for seven yield and five agronomic traits under four water and nitrogen conditions:water stress and low nitrogen,water stress and high nitrogen,well-watered and low nitrogen,and well-watered and high *** eight,six,and six traits varied in response to genotype–water interactions,genotype–nitrogen interactions,and genotype–water–nitrogen *** a linkage map consisting of 896 single-nucleotide polymorphism markers and multipleenvironmental quantitative-trait locus(QTL)mapping,we identified 31 QTL,including 12 for genotype–water–nitrogen interaction,across the four treatments.A set of 8060 genes were differentially expressed among *** genetic analysis,gene co-expression,and functional annotation revealed two candidate genes controlling genotype–water–nitrogen interactions,affecting both leaf width and grain *** involved in abscisic acid biosynthesis and bZIP,NAC,and WRKY transcription factors participated in maize response to water and nitrogen *** results represent a step toward understanding the genetic regulatory network of maize that responds to water and nitrogen stress and provide a theoretical basis for the genetic improvement of both water-and nitrogen-use efficiency.

关键词： Quantitative trait loci Water Nitrogen Interaction Maize

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Evaluation of maize root growth and genome-wide association studies of root traits in response to low nitrogen supply at seedling emergence

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The Crop Journal 2021年第4期9卷 794-804页

作者： Xichao Sun Wei Ren Peng Wang fanjun chen Lixing Yuan Qingchun Pan Guohua Mi College of Resources and Environmental Sciences National Academy of Agriculture Green DevelopmentKey Laboratory of Plant-Soil InteractionsMinistry of EducationChina Agricultural UniversityBeijing 100193China Agro-Environmental Protection Institute Ministry of Agriculture and Rural AffairsTianjin 300191China

Nitrogen(N) deficiency is one of the main factors limiting maize(Zea mays L.) productivity. Genetic improvement of root traits could improve nitrogen use efficiency. An association panel of 461 maize inbred lines was assayed for root growth at seedling emergence under high-nitrate(HN, 5 mmol L^(-1))and low-nitrate(LN, 0.05 mmol L^(-1)) conditions. Twenty-one root traits and three shoot traits were measured. Under LN conditions, the root-to-shoot ratio, root dry weight, total root length, axial root length,and lateral root length on the primary root were all increased. Under LN conditions, the heritability of the plant traits ranged from 0.43 to 0.82, a range much wider than that of 0.27 to 0.55 observed under HN conditions. The panel was genotyped with 542,796 high-density single-nucleotide polymorphism(SNP) markers. Totally 328 significant SNP markers were identified using either mixed linear model(MLM) or general linear model analysis, with 34 detected by both methods. In the 100-kb intervals flanking these SNP markers, four candidate genes were identified. Under LN conditions, the protoporphyrinogen IX oxidase 2 gene was associated with total root surface area and the DELLA protein-encoding gene was associated with the length of the visible lateral root zone of the primary root. Under HN conditions, a histone deacetylase gene was associated with plant height. Under both LN and HN conditions, the gene encoding MA3 domain-containing protein was associated with the first whorl crown root number. The phenotypic and genetic information from this study may be exploited for genetic improvement of root traits aimed at increasing NUE in maize.

关键词： Genome-wide association study(GWAS) Nitrogen Maize Root

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Ideotype root architecture for efficient nitrogen acquisition by maize in intensive cropping systems

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Science China(Life Sciences) 2010年第12期53卷 1369-1373页

作者： MI GuoHua chen fanjun WU QiuPing LAI NingWei YUAN LiXing ZHANG FuSuo Key Laboratory of Plant Nutrition MOAKey Laboratory of Plant-Soil InteractionMOECollege of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193China

The use of nitrogen(N) fertilizers has contributed to the production of a food supply sufficient for both animals and humans despite some negative environmental *** food production by increasing N use efficiency in intensive cropping systems has become a major concern for scientists,environmental groups,and agricultural policymakers *** high-yielding maize systems the major method of N loss is nitrate *** this review paper,the characteristic of nitrate movement in the soil,N uptake by maize as well as the regulation of root growth by soil N availability are *** suggest that an ideotype root architecture for efficient N acquisition in maize should include(i) deeper roots with high activity that are able to uptake nitrate before it moves downward into deep soil;(ii) vigorous lateral root growth under high N input conditions so as to increase spatial N availability in the soil;and(iii) strong response of lateral root growth to localized nitrogen supply so as to utilize unevenly distributed nitrate especially under limited N conditions.

关键词： maize nitrogen use efficiency root architecture nitrate rhizosphere

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The role of maize root size in phosphorus uptake and productivity of maize/faba bean and maize/wheat intercropping systems

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Science China(Life Sciences) 2012年第11期55卷 993-1001页

作者： ZHANG YiKai chen fanjun LI Long chen YanHua LIU BingRan ZHOU YuLing YUAN LiXing ZHANG FuSuo MI GuoHua Key Laboratory of Plant-Soil Interactions Ministry of EducationCenter for ResourcesEnvironment and Food SecurityCollege of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193China

Interspecific root/rhizosphere interactions affect phosphorus (P) uptake and the productivity of maize/faba bean and maize/wheat intercropping systems. The aim of these experiments was to determine whether manipulation of maize root growth could improve the productivity of the two intercropping systems. Two near isogenic maize hybrids (the larger-rooted T149 and smaller-rooted T222) were intercropped with faba bean and wheat, under conditions of high- and low-P availability. The larger-rooted T149 showed greater competitive ability than the smaller-rooted T222 in both maize/faba bean and maize/wheat intercropping systems. The higher competitive ability of T149 improved the productivity of the maize/faba bean intercropping system in P-sufficient conditions. In maize/wheat intercropping systems, root growth, shoot biomass, and P uptake of maize were inhibited by wheat, regardless of the P-supply. Compared with T222, the larger-rooted T149 suffered less in the intercropping systems. The total biomass of the maize/wheat intercropping system was higher for wheat/T149 than for wheat/T222 under low-P conditions. These data suggested that genetic improvement of maize root size could enhance maize growth and its ability to compete for P resources in maize/faba bean and maize/wheat intercropping systems. In addition, depending on the P availability, larger maize roots could increase the productivity of intercropping systems.

关键词： faba bean intercropping maize phosphorus uptake root growth wheat

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Genetic dissection of N use efficiency using maize inbred lines and testcrosses

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The Crop Journal 2023年第4期11卷 1242-1250页

作者： Xiaoyang Liu Kunhui He Farhan Ali Dongdong Li Hongguang Cai Hongwei Zhang Lixing Yuan Wenxin Liu Guohua Mi fanjun chen Qingchun Pan Key Laboratory of Plant-Soil Interactions of Ministry of Education National Academy of Agriculture Green DevelopmentCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Cereal Crops Research Institute Pirsabak NowsheraPakistan College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China Institute of Agricultural Resources and Environment Jilin Academy of Agricultural SciencesChangchun 130033JilinChina Institute of Crop Science Chinese Academy of Agricultural SciencesBeijing 100081China Sanya Institute China Agricultural UniversitySanya 572025HainanChina

Although the use of heterosis in maize breeding has increased crop productivity,the genetic causes underlying heterosis for nitrogen(N) use efficiency(NUE) have been insufficiently *** this study,five N-response traits and five low-N-tolerance traits were investigated using two inbred line populations(ILs) consisting of recombinant inbred lines(RIL) and advanced backcross(ABL) populations,derived from crossing Ye478 with *** populations were crossed with P178 to construct two testcross *** populations,their testcross populations,and the midparent heterosis(MPH)for NUE were *** weight,kernel number,and kernel number per row were sensitive to N level and ILs showed higher N response than did the testcross *** on a highdensity linkage map,138 quantitative trait loci(QTL) were mapped,each explaining 5.6%–38.8% of genetic *** were 52,34 and 52 QTL for IL populations,MPH,and testcross populations,*** finding that 7.6% of QTL were common to the ILs and their testcross populations and that 11.7% were common to the MPH and testcross population indicated that heterosis for NUE traits was regulated by non-additive and non-dominant loci.A QTL on chromosome 5 explained 27% of genetic variation in all of the traits and Gln1-3 was identified as a candidate gene for this ***-wide prediction of NUE traits in the testcross populations showed 14%–51% *** results may be useful for clarifying the genetic basis of heterosis for NUE traits and the candidate gene may be used for genetic improvement of maize NUE.

关键词： Maize Nitrogen use efficiency Heterosis Genetic basis

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Use of genotype-environment interactions to elucidate the pattern of maize root plasticity to nitrogen deficiency

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Journal of Integrative Plant Biology 2016年第3期58卷 242-253页

作者： Pengcheng Li Zhongjuan Zhuang Hongguang Cai Shuai cheng Ayaz Ali Soomro Zhigang Liu Riliang Gu Guohua Mi Lixing Yuan fanjun chen Key Lab of Plant-Soil Interaction MOECenter for ResourcesEnvironment and Food SecurityCollege Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops Key Laboratory of Plant Functional Genomics of the Ministry of EducationYangzhou UniversityYangzhou 225009China Leading Bio-agricultural Co. Ltd.Qinhuangdao 066000China Institute of Agricultural Resource and Environment Jilin Academy of Agricultural SciencesChangchun 130033China

Maize（Zea mays L.） root morphology exhibits a high degree of phenotypic plasticity to nitrogen（N） de ficiency,but the underlying genetic architecture remains to be investigated Using an advanced BC_4F_3 population,we investigated the root growth plasticity under two contrasted N levels and identi fied the quantitative trait loci（QTLs） with QTL-environment（Q×E）interaction effects. Principal components analysis（PCA） on changes of root traits to N de ficiency（D LN-HN） showed that root length and biomass contributed for 45.8% in the same magnitude and direction on the first PC,while root traits scattered highly on PC_2 and PC_3. Hierarchical cluster analysis on traits for D LN-HN further assigned the BC_4F_3 lines into six groups,in which the special phenotypic responses to N de ficiency was presented These results revealed the complicated root plasticity of maize in response to N de ficiency that can be caused by genotype environment（G×E） interactions. Furthermore,QTL mapping using a multi-environment analysis identi fied 35 QTLs for root traits. Nine of these QTLs exhibited signi ficant Q×E interaction effects. Taken together,our findings contribute to understanding the phenotypic and genotypic pattern of root plasticity to N de ficiency,which will be useful for developing maize tolerance cultivars to N de ficiency.

关键词： Genotype-environment interactions nitrogen stress quantitative trait locus root morphology root plasticity Zea mays L

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Engineering and understanding SnS_(0.5)Se_(0.5)@N/S/Se triple-doped carbon nanofibers for enhanced sodium-ion batteries

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Chinese Chemical Letters 2024年第4期35卷 226-230页

作者： fanjun Kong Yixin Ge Shi Tao Zhengqiu Yuan chen Lu Zhida Han Lianghao Yu Bin Qian School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Far East Holding Group Co. Ltd.Yixing 214200China

Tin-based chalcogenides have attracted tremendous attention as an anode material for sodium storage owing to their unique structure and high theoretical capacity. Unfortunately, the large volume change and poor conductivity lead to sluggish reaction kinetics and poor cycling performance. Herein, SnS_(0.5)Se_(0.5)nanoparticles coupled with N/S/Se triple-doped carbon nanofibers(SnS_(0.5)Se_(0.5)@NSSe-C) are designed and synthesized through electrospinning and annealing process. Benefiting from the synergistic effects of SnS_(0.5)Se_(0.5)and NSSe-C, the SnS_(0.5)Se_(0.5)@NSSe-C nanofibers exhibit a high reversible capacity and ultralong cycle life at higher current density for sodium-ion batteries. Furthermore, the sodium storage mechanism and electrochemical reaction kinetics of the SnS_(0.5)Se_(0.5)@NSSe-C composite are characterized by the in-situ measurements. The theoretical calculations further reveal the structural advantages of SnS_(0.5)Se_(0.5)@NSSeC composite, which exhibits a high adsorption energy of Na+. This work can provide a novel idea for the synthesis of ternary tin-based chalcogenides and is beneficial for the investigation of their reaction kinetics.

关键词： SnS_(0.5)Se_(0.5) Carbon nanofibers Doping Density functional theory Sodium ion batteries

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