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Factors affecting poplar wetwood characteristics

Journal of Forestry Research 2023年第5期34卷 1615-1626页

作者： Qilin Zhang Xingyi Hu Qian Hu Jiawei Yang Tianyu Zhao Kebing Du College of Horticulture and Forestry Sciences/Hubei Engineering Technology Research Center for Forestry Information Huazhong Agricultural UniversityWuhan 430070People’s Republic of China Hubei Academy of Forestry Wuhan 430075People’s Republic of China Xiangyang Academy of Forestry Xiangyang 441052People’s Republic of China

Wet wood is an abnormal phenomenon in growing trees,which adversely affects growth,subsequent wood processing and economic values of wood *** this study,the influences of factors such as clones,afforestation methods,site conditions and climate conditions on the characteristics of poplar wetwood were studied through field investigations in 27 clones from 48 sample plots in 28 *** showed that the incidences of wetwood were almost 100%in all *** of wetwood area among the48 plots differed from 15.1 to 90.2%.Wetwood area ratios,moisture contents and pH differed significantly between the 27 *** area ratios of the clones ranged from18.7 to 62.3%.Ratios of wetwood areas were positively correlated with wet wood moisture content and pH,tree age,and negatively correlated with pH of sap *** repeatability of wet wood area ratios was 0.52,moderately controlled by *** moisture content and pH were highly controlled by genetics,indicated by the repeatability of 0.91 and 0.89,*** were significant differences in wetwood area ratios,moisture content and pH between different site conditions,afforestation methods,and geographical *** land had the lowest wetwood area ratios and moisture content among four types of *** by direct seeding and rooted cuttings had the lowest wetwood area ratios and moisture content,*** the three geographical regions,the Yellow River Basin had the lowest wetwood values of all three factors.

关键词： poplar Wetwood Clones Site conditions Afforestation methods

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Identification and Validation of Single Nucleotide Polymorphisms in poplar Using Publicly Expressed Sequence Tags

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Journal of Integrative Plant Biology 2005年第12期47卷 1493-1499页

作者： Bo ZHANG Yan ZHOU Liang ZHANG Qiang ZHUGE Ming-Xiu WANG Min-Ren HUANG Forest Genetics and Gene Engineering Laboratory Nanjing Forestry University Nanjing 210037 China Genomics and Bioinformatics Institute Hangzhou 310008 China

By using assembled expressed sequence tags （ESTs） from 14 different eDNA libraries that contain 84 132 sequences reads, 556 Populus candidate single nucleotide polymorphisms （SNPs） were identified. Because traces were not available from dbEST （http：//***/dbEST/***）, stringent filters were used to identify reliable candidate SNPs. Sequences analysis indicated that the main types of substitutions among candidate SNPs were A/G and T/C transitions, which accounted for 22.0% and 30.8%, respectively. One hundred and ten candidate SNPs were tested. As a result, 38 candidate SNPs were confirmed by directed sequencing of PCR products amplified from six different individuals. Thirteen new SNPs in intron regions were found and multiple SNPs were found to be located in both intron and exon regions of four contigs. Heterozygosis was found in all 47 candidate sites and five SNP sites were heterozygous in all six samples. This is the first report of SNP identification in a tree species which reveals that assembled ESTs from multiple libraries of the public database may provide a rich source of comparative sequences for an SNP search in the poplar genome.

关键词： expressed sequence tag poplar single nucleotide polymorphism.

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Qu-2,a robust poplar suspension cell line for molecular biology

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Journal of Forestry Research 2021年第2期32卷 733-740页

作者： Caixia Liu Kailong Li Meng Wang Erqin Fan Chuanping Yang Junhui Wang Pengyue Fu Xiaolan Ge Heike W.Sederoff Ronald RSederoff Vincent LChiang Sui Wang Guanzheng Qu State Key Laboratory of Tree Genetics and Breeding Northeast Forestry UniversityHarbin 150040People’s Republic of China State Key Laboratory of Tree Genetics and Breeding Key Laboratory of Tree Breeding and Cultivation of State Forestry AdministrationResearch Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China Department of Plant and Microbial Biology North Carolina State UniversityRaleighNC 27695USA Forest Biotechnology Group Department of Forestry and Environmental ResourcesNorth Carolina State UniversityRaleighNC 27695USA Key Laboratory of Soybean Biology in Chinese Ministry of Education Northeast Agricultural UniversityHarbin 150030People’s Republic of China

Populus *** long been used as model woody plant species for molecular biology ***,tissues of poplar are often recalcitrant to experimental procedures for molecular *** generated a hormone autotrophic poplar suspension cell line from a hybrid of Populus alba×***‘Yinzhong’,named ***-2 cells are suitable as a model biological system for studying woody ***-2 cells have many advantages over suspension cell lines derived so far from any other woody ***-2 cells are very easy to cultivate and can grow on several common plant culture media without the addition of any plant *** show exceptionally high growth rates,reaching an approximately 150-fold increase in biomass after one week of *** important unique characteristic of Qu-2 cells is that they can be cryopreserved and readily ***-2 cells are suitable for molecular manipulations such as protoplast production,transient transformation,and RNA-seq ***,Qu-2 cells have the great potential to be an excellent model cell line in tree molecular biological research,ranging from physiology to gene *** Qu-2 cells will be made available to the plant community for research.

关键词： Qu-2 cell line Suspension cell poplar Protoplast isolation Transient transformation

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PtrDJ1C,an atypical member of the DJ-1 superfamily,is essential for early chloroplast development and lignin deposition in poplar

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Horticultural Plant Journal 2023年第5期9卷 1039-1054页

作者： Xinwei Wang Chunxue Shao Libo Liu Yue Wang Yaqi An Hui Li Yunwei Ding Yanping Jing Xiaojuan Li Jianwei Xiao College of Biological Sciences and Biotechnology Beijing Forestry UniversityBeijing 100083China Hebei North University ZhangjiakouHebei 075000China National Engineering Research Center of Tree Breeding and Ecological Restoration Beijing Forestry UniversityBeijing 100083China Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of EducationCollege of Biological Sciences and BiotechnologyBeijing Forestry UniversityBeijing 100083China

The nuclear-encoded factors and the photosynthetic apparatus have been studied extensively during chloroplast ***,many questions regarding these processes remain unanswered,particularly in perennial woody *** a model material of woody plants,poplar not only has very significant value of research,but also possesses economic and ecological *** study reports the Populus trichocarpa DJ-1C(PtrDJ1C)factor,encoded by a nuclear gene,and a member of the DJ-1 ***1C knock-out with the CRISPR/Cas9 system resulted in different albino *** fluorescence and immunoblot analyses showed that the levels of photosynthetic complex proteins decreased ***,the transcript level of plastid-encoded RNA polymerase-dependent genes and the splicing efficiency of several introns were affected in the mutant ***,rRNA accumulation was abnormal,leading to developmental defects in chloroplasts and affecting lignin *** concluded that the PtrDJ1C protein is essential for early chloroplast development and lignin deposition in poplar.

关键词： PtrDJ1C Chloroplast development Gene expression Lignin poplar

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Journal of Forestry Research 2018年第4期29卷 930-938页

作者： Xuanxuan Xia Kexiang Gao Xianshuang Xing Rui Yang Shuyong Zhang Zilong Du Jing Guo Xia Liu Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration Taishan Forest Eco-station of State Forestry Administration Forestry College of Shandong Agricultural University Tai'an 271018 Shandong People's Republic of China Jiangsu Post and Telecommunications Planning and Designing Institute Co. Ltd. Nanjing 210037 People's Republic of China College of Plant Protection Brief of Shandong Agricultural University Tai'an 271018 Shandong People's Republic of China Hydrographic Office of Shandong Province Jinan 250002 People's Republic of China Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province Forestry College of Nanjing Forestry University Nanjing 210037 People's Republic of China

Previous studies showed that Chaetomium globosum ND35 fungus fertilizer can improve the microbial community structure and enzyme activities of replanted soil. However, it remains unclear whether can improve the physiological and ecological characteristics of plants under successive rotation. In this study, we investigated the photosynthetic, physiological, and biochemical indexes including photosynthetic parameters, chlorophyll fluorescence, and chlorophyll content of 1-yeax-old poplar seedlings under seven different doses （range from 0 to 1.67 g kg-1） of C. globosum ND35 fungus fertilizer to study the effects of fungus fertilizer on photosynthesis of poplar. Our results showed that：（1） With increasing application of fungus fertilizer in replanted soil, chlorophyll content of poplar leaves （Chl） increased, while physiological indexes such as electron transport rate （ETR）, net photosynthetic rate （Pn）, quantum efficiency （φ）, nitrate reductase （NR） activity and root vigor initially increased and then declined. Meanwhile, heat dissipation that depended on the xanthophyll cycle declined and nonphotochemical quenching （NPQ） initially increased and then decreased. When the dose of C. globosum ND35 fungus fertilizer was 0.67 g kg-1 （T3） and 1.00 g kg-1 （T4）, excess light energy of photosynthetic apparatus was reduced, and photosynthetic apparatus distributed more light energy to the direction of photochemical reactions, which improved the efficiency of energy use. Plant height and biomass of leaves, stems, and roots were maximum at T3. We conclude that applying appropriate amounts of C. globosum ND35 fungus fertilizer can improve root physiological activity and capacity for use of light by poplar leaves. This can improve the operating states of the photosynthetic apparatus and lead to increased photosynthetic efficiency of poplar leaves and accumulation of dry *** suggests a strategy to alleviate the successive rotation obstacle of soil nutrient depletion.

关键词： poplar Successive rotation Chaetomiumglobosum ND35 Photosynthesis Light use efficiency

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The glutamate receptor gene GLR3.3:A bridge of calciummediated root development in poplar

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Horticultural Plant Journal 2024年第6期10卷 1449-1462页

作者： Yi An Ya Geng Yu Liu Xiao Han Lichao Huang Wei Zeng Jin Zhang Mengzhu Lu State Key Laboratory of Subtropical Silviculture Sino-Australia Plant Cell Wall Research CentreCollege of Forestry and BiotechnologyZhejiang A&F UniversityHangzhouZhejiang 311300China

poplar is one of the fastest-growing temperate trees in the world and is widely used in ornamental horticulture for *** root is essential for tree growth and development and its utilization potential is ***(Ca),as a signaling molecule,is involved in the regulation of plant root ***,the detailed underlying regulatory mechanism is *** this study,we analyzed the morphological and transcriptomic variations of 84K poplar(Populus alba×***)in response to different calcium concentrations and found that low Ca^(2+)(1 mmol·L^(-1))promoted lateral root development,while deficiency(0.1 mmol·L^(-1)Ca^(2+))inhibited lateral root ***-expression analysis showed that Ca^(2+)channel glutamate receptors(GLRs)were present in various modules with significance for root *** GLR paralogous genes,PagGLR3.3a and Pag GLR3.3b,were mainly expressed in roots and up-regulated under Ca^(2+)*** CRISPR/Cas9-mediated signal gene(crispr-PagGLR3.3a,PagGLR3.3b)and double gene(crispr-PagGLR3.3ab)mutants presented more and longer lateral *** analysis showed that crispr-PagGLR3.3ab plants had more xylem cells and promoted the development of secondary vascular *** transcriptomic analysis suggested that knockout of PagGLR3.3a and PagGLR3.3b led to the up-regulation of several genes related to protein phosphorylation,auxin efflux,lignin and hemicellulose biosynthesis as well as transcriptional regulation,which might contribute to lateral root *** study not only provides novel insight into how the Ca^(2+)channels mediated root growth and development in trees,but also provides a directive breeding of new poplar species for biofuel and bioenergy production.

关键词： Glutamate receptor Calcium Root development Lateral root poplar

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Application of pre-emergence herbicides in poplar nursery production

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Journal of Forestry Research 2015年第1期26卷 143-151页

作者： Verica Vasic Sasa Orlovic Predrag Pap Branislav Kovacevic Milan Drekic Leopold Poljakovic Pajnik Zoran Galic Institute of Lowland Forestry and Environment University of Novi Sad

In addition to pests and diseases, weeds are a major problem in poplar nursery production. The possibilities of herbicide application in juvenile poplar growth were researched, taking into account that weeds are one of the main limiting factors. The following pre-emergence herbicides were tested： acetochlor, S-metolachlor, metribuzin,oxifluorfen, and dimethenamid during two vegetation seasons at two locations, which differed by the soil physicochemical characteristics. The study results show that the number of weeds on sample plots was significantly reduced by the tested herbicides when compared to control plots. The highest reduction in the number of weeds was achieved using the herbicides acetochlor and metribuzin. However, metribuzin showed a phytotoxic effect on sandy soil. Metribuzin application is recommended only on the soils with higher contents of organic matter, where the phytotoxic effect was absent. Acetochlor, S-metolachlor, oxifluorfen, and dimethenamid were not phytotoxic to poplars and can be used for weed suppression in the production of poplar plants.

关键词： poplar weeds Weed management Herbicides Phytotoxic effects

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Molecular Dissection of Xylan Biosynthesis during Wood Formation in poplar

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Molecular Plant 2011年第4期4卷 730-747页

作者： Chanhui Lee Quincy Teng Ruiqin Zhong Zheng-Hua Ye Department of Plant Biology University of Georgia Athens GA 30602 USA National Exposure Research Laboratory US Environmental Protection Agency Athens GA 30605 USA

Xylan, being the second most abundant polysaccharide in dicot wood, is considered to be one of the factors contributing to wood biomass recalcitrance for biofuel production. To better utilize wood as biofuel feedstock, it is crucial to functionally characterize all the genes involved in xylan biosynthesis during wood formation. In this report, we investigated roles of poplar families GT43 and GT8 glycosyltransferases in xylan biosynthesis during wood formation. There exist seven GT43 genes in the genome of poplar （Populus trichocarpa）, five of which, namely PtrGT43A, PtrGT43B, PtrGT43C, PtrGT43D, and PtrGT43E, were shown to be highly expressed in the developing wood and their encoded proteins were localized in the Golgi. Comprehensive genetic complementation coupled with chemical analyses demonstrated that overexpression of PtrGT43A/B/E but not PtrGT43C/D was able to rescue the xylan defects conferred by the Arabidopsis irx9 mutant, whereas overexpression of PtrGT43C/D but not PtrGT43A/B/E led to a complementation of the xylan defects in the Arabidopsis irx14 mutant. The essential roles of poplar GT43 members in xylan biosynthesis was further substantiated by RNAi down-regulation of GT43B in the hybrid poplar （Populus alba x tremula） leading to reductions in wall thickness and xylan content in wood, and an elevation in the abundance of the xylan reducing end sequence. Wood digestibility analysis revealed that cellulase digestion released more glucose from the wood of poplar GT43B RNAi lines than the control wood, indicating a decrease in wood biomass recalcitrance. Furthermore, RNAi down-regulation of another poplar wood-associated glycosyltransferase, PoGTSD, was shown to cause decreases in wall thickness and xylan content as well as in the abundance of the xylan reducing end sequence. Together, these findings demonstrate that the poplar GT43 members form two functionally non-redundant groups, namely PtrGT43A/B/E as functional orthologs of Arabidopsis IRX9 and PtrG

关键词： Glycosyltransferase GT8 family GT43 family poplar wood formation xylan.

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Hydrophobic poplar Prepared via High Voltage Electric Field(HVEF)with Copper as Electrode Plate

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Journal of Renewable Materials 2022年第11期10卷 2907-2919页

作者： Jianxin Cui Zehui Ju Lu Hong Biqing Shu Xiaoning Lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China School of Forestry and Landscape Architecture Anhui Agricultural UniversityHefei230036China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

In order to improve hydrophobic characteristics which will affect the service performance of fast-growing poplar due to growing bacteria in the humid *** this study,a simple method was proposed to treat poplar via the high voltage electric field(HVEF)with copper as the electrode *** electron microscope(SEM),Fourier transforms infrared spectroscopy(FTIR),X-ray diffraction(XRD)and contact angle tester were adopted to evaluate the surface morphology,surface group of poplar,crystallinity and wettability under *** was found by SEM that a large number of copper particles were uniformly attached to the surface of *** all three sections,the weight percentage of the Cu element was accounting for more than *** diffraction peaks of copper-containing compounds appeared in the(XRD).FTIR analysis confirmed that the reaction between copper and poplar took *** surface contact angle of three sections of poplar increased in the following order:cross section

关键词： poplar high voltage electric field wettability hydrophobic copper particles

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Study on the Bonding Performance of the Moso Bamboo Dowel Welded to a poplar Substrate Joint by High-Speed Rotation

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Journal of Renewable Materials 2021年第7期9卷 1225-1237页

作者： Suxia Li Haiyang Zhang Biqing Shu Liangsong Cheng Zehui Ju Xiaoning Lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Furniture and Art Design Central South University of Forestry and TechnologyChangsha410004China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

The wood friction welding technique with its high bonding strength,low cost,high efficiency,and without any adhesive has been increasing concern in *** bamboo(Phyllostachys pubescens)and poplar(Populus sp.)are widely planted and used in the furniture industry,interior decoration,and wood structure construction in *** aim of this work was to investigate the bonding performance of moso bamboo dowel rotation welded joints with different dowel/receiving hole diameter *** results indicated that the ratio of dowel/receiving hole diameter was an important parameter that influenced the welding *** bonding strength of the bamboo-to-poplar welded joints at the optimal ratio of 10/7 was as high as 7.50 MPa,which was higher than that of the beech(Fagus sylvatica,L.),schima(Schima superba)dowels and PVAc glued *** temperature measurement results showed a peak temperature of bamboo dowel welding as high as 350–360°*** differences in the temperature curves between each dowel/hole diameter ratio group were observed at the three different hole depths,such as the friction time,peak temperatures,and stabilization time at the maximum temperature,which could explain the differences in welding strengths between different *** SEM results showed the temperature-induced softening,melting and flowing of cell-interconnected polymer material in the wood and bamboo struc*** addition,the bamboo fibers(mainly vascular bundles)were wrapped to form a dense continuous bonding layer,similar to the reinforced concrete,thus producing a good bonding *** Fourier transform-infrared spectroscopy(FT-IR)analyses showed that the high temperature resulted in the increase of the lignin relative content due to the degradation reaction of cellulose in the welding zone,which improved the bonding properties.

关键词： Moso bamboo rotation welding tensile strength optimal ratio poplar

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