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An overview of plant centromeres

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Journal of Genetics and Genomics 2009年第9期36卷 529-537页

作者： guixiang wang Xueyong Zhang Weiwei Jin National Maize Improvement Center of China Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100094 China Key Laboratory of Crop Germplasm Utilization MOA Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 China

The centromere is a defining region that mediates chromosome attachment to kinetochore microtubules and proper segregation of the sister chromatids. Intriguingly, satellite DNA and centromeric retrotransposon as major DNA constituents of centromere showed baffling diversification and species-specific. However, the key kinetochore proteins are conserved in both plants and animals, particularly the centromere-specific histone H3-1ike protein （CENH3） in all functional centromeres. Recent studies have highlighted the importance of epigenetic mechanisms in the establishment and maintenance of centromere identity. Here, we review the progress and compendium of research on plant centromere in the light of recent data.

关键词： plant chromosome centromere centromeric DNA CENH3

Effect of modified MgAl-LDH coating on corrosion resistance and friction properties of aluminum alloy

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Chinese Journal of Chemical Engineering 2023年第11期63卷 81-95页

作者： Zuokai wang Zhuangzhuang Xiong Xinxin Li Di wang Yuelin wang Shangcheng Wu Lixia Ying Zhideng wang guixiang wang College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China College of Materials Science and Chemical Engineering Yantai Research Institute of Harbin Engineering UniversityYantai 265503China

The in-situ growing approach was utilized in this article to construct the magnesium–aluminum layered double hydroxide(MgAl-LDH)film on the surface of a 1060 aluminum anodized *** improve the corrosion resistance and friction qualities of aluminum alloy,the MgAl-LDH coating was treated using stearic acid(SA)and thiourea(TU).The aluminum substrate and anodized aluminum film layer corroded to varying degrees after 24 h of immersion in 3.5%(mass)NaCl solution,while the modified hydrotalcite film layer continued to exhibit the same microscopic morphology even after being immersed for 7 *** results show that the synergistic action of thiourea and stearic acid can effectively improve the corrosion resistance of the MgAl-LDH *** tribological testing reveals that the hydrotalcite film layer and the modified film layer lowered the friction coefficient of the anodized aluminum surface *** results of the simulations and experiments demonstrate that SA forms the dense LDH-TU interlayer film layer by exchanging NO_(3)^(-)ions between TU layers on the one hand and the LDH-SA film layer by adsorption on the surface of LDH on the ***,these two processes create LDH-TUSA,which can significantly increase the substrate’s corrosion *** synergistically modified superhydrophobic and retardant hydrotalcite film layer offers a novel approach to the investigation of wear reduction and corrosion protection on the surface of aluminum and its alloys.

关键词： Anodizing Layered double hydroxide Superhydrophobic Corrosion resistance Tribological properties

In situ protonation in a locally flexible porous coordination polymer for enhancing proton-carrier loading and proton conductivity

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Science China Chemistry 2024年第10期67卷 3432-3437页

作者： Xianzhe Wei Jincheng Liu Yan Su Weitao wang guixiang wang Gen Zhang Ping wang Cheng Gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China

Designing efficient proton-conductive materials is crucial in fuel ***,it remains a substantial challenge because of the issues in proton mobility,proton-carrier amount,and orientation of proton host ***,we report an in-situ protonation strategy to produce a locally flexible porous coordination polymer(PCP)to enhance the proton-carrier loading and proton *** local dipole flipping of the ligand allows effective proton exchange with low activation energy,promoting interpore proton transport through the pore apertures and pore *** protonation induces substantial charges to the frameworks and enhances the interaction with proton carriers,thereby increasing the loading of the proton *** this design strategy,the resulting PCP exhibits enhanced phosphoric acid loading and extraordinary proton conductivities under both aqueous and anhydrous conditions compared to its isoreticular analog that features rigidity without proton-exchange *** work provides a new avenue for designing proton-conductive materials that combine structural dynamics with performance merits.

关键词： porous coordination polymers in-situ protonation local flexibility proton-exchange mechanism proton conduction

Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg-9Li-3Al alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1453-1463页

作者： Siyuan Jin Xiaochun Ma Ruizhi Wu Tingqu Li Jiaxiu wang Boris L Krit Legan Hou Jinghuai Zhang guixiang wang Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Materials Science and Engineering Jilin Institute of Chemical TechnologyJilin 132022China College of Science Heihe UniversityHeihe 164300China Moscow Aviation Institute National Research UniversityMoscow 125993Russia

Carbonate was added to the silicate system electrolyte to improve the corrosion resistance of the plasma electrolytic oxidation coating on Mg-9Li-3Al(wt%,LA93)*** influences of carbonate on the morphology,structure,and phase composition of the coating were investigated by scanning electron microscopy,energy dispersive spectrometry,X-ray diffraction,and X-ray photoelectron *** corrosion resistance of the coating was evaluated by electrochemical experiment,hydrogen evolution,and immersion *** results showed that the addition of carbonate resulted in a denser coating with increased hardness,and the corrosion-resistant Li_(2)CO_(3) phase was *** experiments showed that compared with the coating without carbonate,the corrosion potential of the carbonate coating positively shifted(24 mV),and the corrosion current density was reduced by approximately an order of *** coating with carbonate addition possessed a high corrosion resistance and long-term protection capability.

关键词： Mg-Li alloy plasma electrolytic oxidation corrosion resistance carbonate

Ethanol changes Nestin-promoter induced neural stem cells to disturb newborn dendritic spine remodeling in the hippocampus of mice

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Neural Regeneration Research 2024年第2期19卷 416-424页

作者： guixiang wang Wenjia wang Ye Zhang Xiaoying Gou Qingqing Zhang Yanmiao Huang Kuo Zhang Haotian Zhang Jingyu Yang Yuting Li Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyangLiaoning ProvinceChina Department of Pharmacology Shenyang Pharmaceutical UniversityShenyangLiaoning ProvinceChina

Adolescent binge drinking leads to long-lasting disorders of the adult central nervous system,particularly aberrant hippocampal *** this study,we applied in vivo fluorescent tracing using NestinCreERT2::Rosa26-tdTomato mice and analyzed the endogenous neurogenesis lineage progression of neural stem cells(NSCs)and dendritic spine formation of newborn neurons in the subgranular zone of the dentate *** found abnormal orientation of tamoxifen-induced tdTomato+(tdTom^(+))NSCs in adult mice 2 months after treatment with EtOH(5.0 g/kg,i.p.)for 7 consecutive *** markedly inhibited tdTom^(+)NSCs activation and hippocampal neurogenesis in mouse dentate gyrus from adolescence to ***(100 mM)also significantly inhibited the proliferation to 39.2%and differentiation of primary NSCs in *** mice exposed to EtOH also exhibited marked inhibitions in dendritic spine growth and newborn neuron maturation in the dentate gyrus,which was partially reversed by voluntary running or inhibition of the mammalian target of rapamycinenhancer of zeste homolog 2 *** vivo tracing revealed that EtOH induced abnormal orientation of tdTom+NSCs and spatial misposition defects of newborn neurons,thus causing the disturbance of hippocampal neurogenesis and dendritic spine remodeling in mice.

关键词： adolescence adulthood ethanol dentate gyrus EZH2 in vivo tracing lineage progression mTOR neural stem cell newborn dendritic spine newborn neurons

In vivo haploid induction in cauliflower,kale,and broccoli

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Journal of Integrative Plant Biology 2024年第9期66卷 1823-1826页

作者： guixiang wang Mei Zong Shuo Han Hong Zhao Mengmeng Duan Xin Liu Ning Guo Fan Liu State Key Laboratory of Vegetable Biobreeding Beijing Key Laboratory of Vegetable Germplasm ImprovementBeijing Vegetable Research CenterBeijing Academy of Agriculture and Forestry SciencesBeijing100097China

Brassica oleracea (family Brassicaceae) represents a group of economically valuable vegetables cultivated worldwide,including cabbage (var. capitata), cauliflower (var. botrytis),broccoli (var. italica), and kale (var. acephala). These crops are typically self-incompatible and require vernalization for flowering, thereby contributing to their long growth cycles.

关键词： breeding crops thereby

Preparation of chitosan/phosphate composite coating on Mg alloy (AZ31B) via one-step chemical conversion method

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Resources Chemicals and Materials 2023年第1期2卷 39-48页

作者： Ziheng Qi Yinghai Zhao Mingbo Ji guixiang wang Lixia Ying Zhideng wang Boris Krit College of Materials Science and Chemical Engineering Harbin Engineering University150001HarbinChina Moscow Aviation Institute(National Research University) 125993MoscowRussia

The purpose of this study is to develop chitosan/phosphate composite films on magnesium alloys to improve their corrosion resistance and broaden their applications in ***/chitosan composite films were successfully prepared by adding ultra-high deacetylated chitosan in a phosphate *** chemical composition of the prepared composite film was investigated by X-ray photoelectron spectroscopy(XPS)and Fourier trans-form infrared spectroscopy(FT-IR),and the morphology and fracture of the composite film were characterized by scanning electron microscope(SEM).Potentiodynamic polarization curves and electrochemical impedance spec-troscopy were used to study the corrosion behavior of the coated *** results showed that when pH=2.5 and the chitosan concentration was 5.0 g/L,chitosan was deposited in the phosphate coating in the form of *** addition,the potentiodynamic polarization curves of the composite films show that the corrosion potential is positively shifted by 0.6 V compared to the monolayer phosphate coating,indicating improved corro-sion *** work shows that highly deacetylated chitosan can be co-deposited with phosphate to form a dense composite film on the surface of magnesium alloys in one step,thereby improving the corrosion resistance of the alloy.

关键词： Magnesium alloys Chitosan Phosphate coating Surface treatment Corrosion resistance

Efficient generation of targeted point mutations in the Brassica oleracea *** genome via a modified CRISPR/Cas9 system

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Horticultural Plant Journal 2022年第4期8卷 527-530页

作者： guixiang wang Mei Zong Di Liu Yage Wu Shouwei Tian Shuo Han Ning Guo Mengmeng Duan Liming Miao Fan Liu Beijing Vegetable Research Center Beijing Academy of Agriculture and Forestry SciencesKey Laboratory of Biology and Genetic Improvement of Horticultural Crops(North China)Ministry of AgricultureBeijing Key Laboratory of Vegetable Germplasm ImprovementBeijing 100097China

In this study,we used the modified CRISPR/Cas9 system to produce targeted point mutations in *** synthase(ALS)and Centromere-specific histone H3 variant(CENH3)genes were selected as the base-editing targets and hypocotyls of cauliflower were used as *** ALS gene,a C-to-T conversion in the Pro182 codon(CCT)can alter the encoded amino acid,likely resulting in herbicide resistance,and a C-to-T mutation in the Leu133 codon(CTT)in the CENH3 gene may produce a haploid *** indicated that the transformation efficiency was 1.8%–4.5%and the mutation efficiencies for the ALS and CENH3 genes were approximately 22%and 87%,*** ALS mutant cauliflower showed strong herbicide resistance,with possible immediate implications for broadleaf weed control in cauliflower fields.

关键词： Cauliflower Targeted point mutations Base-editing CRISPR/Cas9 ALS CENH3

A graph-based pan-genome of Brassica oleracea provides new insights into its domestication and morphotype diversification

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Plant Communications 2024年第2期5卷 261-278页

作者： Ning Guo Shenyun wang Tianyi wang Mengmeng Duan Mei Zong Liming Miao Shuo Han guixiang wang Xin Liu Deshuang Zhang Chengzhi Jiao Hongwei Xu Liyang Chen Zhangjun Fei Jianbin Li Fan Liu State Key Laboratory of Vegetable Biobreeding National Engineering Research Center for VegetablesBeijing Key Laboratory of Vegetable Germplasm ImprovementKey Laboratory of Biology and Genetics Improvement of Horticultural Crops(North China)Beijing Vegetable Research CenterBeijing Academy of Agriculture and Forestry ScienceBeijing 100097China Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement Vegetable Research InstituteJiangsu Academy of Agricultural ScienceNanjingJiangsuChina Smartgenomics Technology Institute Tianjin 301700China Boyce Thompson Institute IthacaNYUSA

The domestication of Brassica oleracea has resulted in diverse morphological types with distinct patterns of organ *** we report a graph-based pan-genome of *** constructed from high-quality genome assemblies of different *** pan-genome harbors over 200 structural variant hotspot regions enriched in auxin-andflowering-related *** genomic analyses revealed that early domestication of *** focused on leaf or stem *** resulting from agricultural practices and variety improvement were detected among different ***-sweep and pan-genome analyses identified an auxin-responsive small auxin up-regulated RNA gene and a CLAV-ATA3/ESR-RELATED family gene as crucial players in leaf–stem differentiation during the early stage of *** domestication and the BoKAN1 gene as instrumental in shaping the leafy heads of cabbage and Brussels *** pan-genome and functional analyses further revealed that variations in the BoFLC2 gene play key roles in the divergence of vernalization andflowering characteristics among different morphotypes,and variations in thefirst intron of BoFLC3 are involved infine-tuning theflowering process in *** study provides a comprehensive understanding of the pan-genome of *** and sheds light on the domestication and differential organ development of this globally important crop species.

关键词： Brassica oleracea graph-based pan-genome structural variants SV domestication morphotype diversification