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PagMYB128 regulates secondary cell wall formation by direct activation of cell wall biosynthetic genes during wood formation in poplar

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Journal of Integrative Plant Biology 2024年第8期66卷 1658-1674页

作者： Yuanyuan Hao fachuang lu Seung-Won Pyo Min-Ha Kim Jae-Heung Ko Xiaojing Yan John Ralph Quanzi Li State Key Laboratory of Tree Genetics and Breeding Chinese Academy of ForestryBeijing 100091China Department of Biochemistry and DOE Great Lakes Bioenergy Research Center Wisconsin Energy InstituteUniversity of Wisconsin-MadisonWisconsin 53726USA Department of Plant&Environmental New Resources Kyung Hee UniversityYongin 17104Korea

The biosynthesis of cellulose,lignin,and hemicelluloses in plant secondary cell walls(SCWs)is regulated by a hierarchical transcriptional regulatory *** network features orthologous transcription factors shared between poplar and Arabidopsis,highlighting a foundational similarity in their genetic ***,knowledge on the discrepant behavior of the transcriptional-level molecular regulatory mechanisms between poplar and Arabidopsis remains *** this study,we investigated the function of PagMYB128 during wood formation and found it had broader impacts on SCW formation compared to its Arabidopsis ortholog,*** poplar trees overexpressing PagMYB128 exhibited significantly enhanced xylem development,with fiber cells and vessels displaying thicker walls,and an increase in the levels of cellulose,lignin,and hemicelluloses in the *** contrast,plants with dominant repression of PagMYB128 demonstrated the opposite *** sequencing and reverse transcription–quantitative polymerase chain reaction showed that PagMYB128 could activate SCW biosynthetic gene expression,and chromatin immunoprecipitation along with yeast one-hybrid,and effector–reporter assays showed this regulation was *** analysis revealed that PagSND1(SECONDARY WALL-ASSOCIATED NAC-DOMAIN PROTEIN1)directly regulates PagMYB128 but not cell wall metabolic genes,highlighting the pivotal role of PagMYB128 in the SND1-driven regulatory network for wood development,thereby creating a feedforward loop in SCW biosynthesis.

关键词： cellulose hemicellulose lignin PagMYB128 Populus transcription factor wood formation

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Chemicals,Energy,and Biomaterials from Agricultural Waste Resources in South China

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Paper And Biomaterials 2016年第2期1卷 51-62页

作者： ZhouYang Xiang fachuang lu State Key Laboratory of Pulp and Paper Engineering South China University of Technology Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China Qilu University of Technology

Owing to its subtropical or tropical environment and climate,South China is home to unique agricultural crops such as sugar cane,pineapple,banana,cassava,and rice,which generate a large amount of lignocellulosic agricultural wastes during agricultural as well as associated industrial *** efficient utilization of these wastes will have a significant impact on the economy and sustainable development of South *** paper reviews the research investigations conducted both in China and elsewhere on the conversion of wastes from these subtropical or tropical agricultural crops into useful chemicals,energy,and *** goal of this paper is to promote and summarize the extensive investigations on these agricultural wastes for the development of biorefinery.

关键词： agricultural waste South China biorefinery absorbent enzyme chemical combustion fiber-based product

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Structure Elucidation of Hydroxypropyl Cellulose Homogenously Prepared from NaOH/Urea Aqueous Solution

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Paper And Biomaterials 2016年第2期1卷 1-7页

作者： HaiSong Qi Tao Song fachuang lu South China University of Technology School of Light Industry and Engineering GuangzhouGuangdong Province 510640 China Leibniz Institute of Polymer Research Dresden Hohe Str. 6 D-01069 Dresden Germany

Hydroxypropyl celluloses(HPC) were homogenously synthesized by the reaction of cellulose with propylene oxide in NaOH/urea aqueous ***-soluble HPC with molar degree of substitution(MSNMR) in the range of 0.52~0.78 was prepared from microcrystalline cellulose,cotton linters,and spruce sulfite *** structure of the HPC samples was characterized by means of FT-IR,NMR,gas chromatography(GC),and size exclusion chromatography(SEC) *** types of cellulose samples with different molecular weights were found to dissolve well in the NaOH/urea solvent with no obvious differences in reactivity and *** relative reactivity of hydroxyl groups in the glycosyl unit was in the following order:O-6>O-2>*** addition,the results of the study indicated that the tandem reaction during hydroxypropylation could be ignored.

关键词： hydroxypropyl cellulose NaOH/urea aqueous solution structure homogenous synthesis gas chromatography analysis

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Identification of Lignin and Polysaccharide Modifications in Populus Wood by Chemometric Analysis of 2D NMR Spectra from Dissolved Cell Walls

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Molecular Plant 2009年第5期2卷 933-942页

作者： Mattias Hedenstrom Susanne Wiklund-Lindstrom Tommy Oman fachuang lu Lorenz Gerber Paul Schatz Bjorn Sundberg John Ralph Department of Chemistry Umea University SE-90187 Umea Sweden Department of Biochemistry and Great Lakes Bioenergy Research Center University of Wisconsin Madison WI 53706 USA Umea Plant Science Centre Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences SE-90183 Umea Sweden US Dairy Forage Research Center USDA-Agricultural Research Service Madison WI 53706 USA

2D ^13C-^1H HSQC NMR spectroscopy of acetylated cell walls in solution gives a detailed fingerprint that can be used to assess the chemical composition of the complete wall without extensive degradation. We demonstrate how multivariate analysis of such spectra can be used to visualize cell wall changes between sample types as high-resolution 2D NMR loading spectra. Changes in composition and structure for both lignin and polysaccharides can subsequently be interpreted on a molecular level. The multivariate approach alleviates problems associated with peak picking of overlapping peaks, and it allows the deduction of the relative importance of each peak for sample discrimination. As a first proof of concept, we compare Populus tension wood to normal wood. All well established differences in cellulose, hemicellulose, and lignin compositions between these wood types were readily detected, confirming the reliability of the multivariate approach, In a second example, wood from transgenic Populus modified in their degree of pectin methylesterification was compared to that of wild-type trees. We show that differences in both lignin and polysaccharide composition that are difficult to detect with traditional spectral analysis and that could not be a priori predicted were revealed by the multivariate approach. 2D NMR of dissolved cell wall samples combined with multivariate analysis constitutes a novel approach in cell wall analysis and provides a new tool that will benefit cell wall research.

关键词： Aspen biostatistics cell walls multivariate data analysis NMR spectroscopy tension wood

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Synthesis of Amphiphilic Starch Derivatives Using One-pot Synthesis Procedure

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Paper And Biomaterials 2018年第1期3卷 1-9页

作者： Tao Song FengXia Yue XueZhu Xu ChunLin Xu Yi-Chen Li fachuang lu HaiSong Qi State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of Technology Department of Biochemistry and DOE Great Lakes Bioenergy Research Center Wisconsin Energy Institute University of Wisconsin–Madison Fiber and Polymer Science University of California Johan Gadolin Process Chemistry Centre Laboratory of Wood and Paper Chemistry Faculty of Science and Engineering ?bo Akademi University Biomaterials Innovation Research Center Department of Medicine Brigham and Women's Hospital Harvard Medical School

Amphiphilic starch derivatives with high content of functional groups were prepared from potato starch using a one-pot synthesis method with a single reaction medium for the entire procedure. Potato starch was benzylated, followed by the introduction of hydroxypropyltrimethylammonium(HPMA) moieties without the purification of intermediates. The synthesis was performed under heterogeneous conditions, leading to the formation of benzyl 2-hydroxypropyltri methylammonium starch chloride(BnHPMAS) with a total degree of substitution(DS) of up to 1.4. This process improved the efficiency of the preparation of amphiphilic starch derivatives and reduced the time and resources consumed by avoiding a separation process and purification of the intermediate *** DS of BnHPMAS was in the range of 0.36 to 1.4, which could be tuned by varying the molar ratio of the reagents to repeating unit or by changing the reaction temperature, time, and medium. The structure of the amphiphilic starches was characterized using elemental analysis, size exclusion chromatography,fourier transform infrared spectroscopy(FT-IR), and nuclear magnetic resonance(NMR) spectroscopy. Moreover, the surface tension and turbidity of the solutions of the products were measured for their potential application in the removal of dissolved and colloidal substances in paper cycling water.

关键词： amphiphilicstarchderivatives chemicalmodification degreeofsubstitution turbidity

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