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Functional characterization of two flavone synthase Ⅱ members in citrus

Horticulture Research 2023年第7期10卷 250-264页

作者： Juan Zheng Chenning Zhao Zhenkun Liao xiaojuan liu Qin Gong Chenwen Zhou Yilong liu Yue Wang Jinping Cao Lili liu Dengliang Wang Chongde Sun Plant Growth Development and Quality ImprovementZhejiang Provincial Key Laboratory of Integrative Biology of Horticultural PlantsZhejiang UniversityHangzhou310000China Quzhou Academy of Agriculture and Forestry Science Quzhou324000China

Polymethoxylated flavones(PMFs),the main form of flavones in citrus,are derived from the flavone branch of the flavonoid biosynthesis *** synthases(FNSs)are enzymes that catalyze the synthesis of flavones from ***,the FNS in citrus has not been characterized ***,we identified two type II FNSs,designated CitFNSII-1 and CitFNSII-2,based on phylogenetics and transcriptome *** recombinant CitFNSII-1 and CitFNSII-2 proteins directly converted naringenin,pinocembrin,and liquiritigenin to the corresponding flavones in *** addition,transient overexpression of CitFNSII-1 and CitFNSII-2,respectively,in citrus peel significantly enhanced the accumulation of total PMFs,while virus-induced CitFNSII-1 and CitFNSII-2 genes silencing simultaneously significantly reduced the expression levels of both genes and total PMF content in citrus ***-1 and CitFNSII-2 presented distinct expression patterns in different cultivars as well as different developmental *** salicylate(MeSA)treatment reduced the CitFNSII-2 expression as well as the PMFs content in the peel of Citrus sinensis fruit but did not affect the CitFNSII-1 *** results indicated that both CitFNSII-1 and CitFNSII-2 participated in the flavone biosynthesis in citrus while the regulatory mechanism governing their expression might be *** findings improved the understanding of the PMFs biosynthesis pathway in citrus and laid the foundation for further investigation on flavone synthesis regulation.

关键词： synthesis converted characterization

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The phased chromosome-scale genome of yellowhorn sheds light on the mechanism of petal color change

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Horticultural Plant Journal 2023年第6期9卷 1193-1206页

作者： Quanxin Bi Mengke Wang Jiang Li Jinmin Lian Yongchao Niu Yifan Cui xiaojuan liu Haiyan Yu Libing Wang State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Biozeron Shenzhen Inc.ShenzhenGuangzhouGuangdong 518000China

Yellowhorn(Xanthoceras sorbifolium), especially its varieties, is the red petal yellowhorn(X. sorbifolium var. purpurea), an important tree species with great ornamental value, and its flower petals change color throughout the flowering period. In this study, we mainly focused on the mechanism of the petal color change with transcriptomics and metabolomics data. A phased chromosome-scale assembly of the red petal yellowhorn genome was generated using the PacBio high-fidelity reads, Illumina short reads, and Phase genomics Proximo Hi-C data. The final de novo assembly yielded 533.67 Mb with a contig N50 of 5.42 Mb, and 27 501 protein-coding genes were predicted. Notably, an alternate haplotig assembly was also obtained. Furthermore, a variation database for the alleles within the genome was constructed. Subsequently, the expression pattern of flower pigmentation-related genes and allelic expression imbalance events were investigated. Apart from 6 genes involved in the anthocyanin biosynthesis pathway regulated by the activation of 15 MYB-bHLH-WD40s, the increased expression of senescencerelated gene 1(SRG1) and 2-oxoglutarate-dependent dioxygenase(DIOX5) might also result in decreasing content of lutein and increasing abundance of(E/Z)-phytoene, cyanidin-3-O-rutinoside, and cyanidin-3-O-sambubioside. These changes in genes and metabolites were most likely related to the petal color change in red petal yellowhorn. This phased chromosome-scale genome assembly provides more accurate genomic information for future molecular breeding and facilitates allele function studies of the red petal yellowhorn.

关键词： Xanthoceras sorbifolium var.purpurea Phased genome Metabolomics Transcriptomics Petal color

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Genome-wide analysis of cytochrome P450 genes in Citrus clementina and characterization of a CYP gene encoding f lavonoid 3′-hydroxylase

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Horticulture Research 2023年第2期10卷 298-311页

作者： xiaojuan liu Qin Gong Chenning Zhao Dengliang Wang Xianming Ye Guixia Zheng Yue Wang Jinping Cao Chongde Sun Laboratory of Fruit Quality Biology The State Agriculture Ministry Laboratory of Horticultural Plant GrowthDevelopment and Quality ImprovementZhejiang Provincial Key Laboratory of Integrative Biology of Horticultural PlantsZhejiang UniversityHangzhouChina Institute of Fruit Tree Research Quzhou Academy of Agriculture and Forestry AcienceQuzhouChina Research and Development Department Zhejiang Jianong Fruit&Vegetable Co.LtdQuzhouChina

Cytochrome P450s(CYPs)are the largest family of enzymes in plant and play multifarious roles in development and defense but the available information about the CYP superfamily in citrus is very *** we provide a comprehensive genome-wide analysis of the CYP superfamily in Citrus clementina genome,identifying 301 CYP genes grouped into ten clans and 49 *** characteristics of both gene structures and motif compositions strongly supported the reliability of the phylogenetic *** analysis indicated that tandem duplication was the major driving force of expansion for this *** analysis revealed numerous cis-acting elements related to various ***-seq data elucidated their expression patterns in citrus fruit peel both during development and in response to ***,we characterize a UV-B-induced CYP gene(Ciclev10019637m,designated CitF3′H)as a f lavonoid 3-hydroxylase for the first ***3 H catalyzed numerous f lavonoids and favored naringenin in yeast *** silencing of CitF3′ H in citrus seedlings significantly reduced the levels of 3′-hydroxylated f lavonoids and their *** results together with the endoplasmic reticulum-localization of CitF3 H in plant suggest that this enzyme is responsible for the biosynthesis of 3-hydroxylated f lavonoids in *** together,our findings provide extensive information about the CYP superfamily in citrus and contribute to further functional verification.

关键词： citrus CYP Citrus

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δ^(13)C difference between plants and soil organic matter along the eastern slope of Mount Gongga

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Chinese Science Bulletin 2010年第22期55卷 55-62页

作者： CHEN PengNa WANG GuoAn HAN JiaMao liu xiaojuan liu Min Key Laboratory of Plant-Soil Interactions Ministry of Education College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China College of Environmental Sciences MOE Laboratory for Earth Surface Processes Peking University Beijing 100871 China

Carbon isotope ratios (δ 13C) of plants, litter and soil organic matter (0–5 cm, 5–10 cm and 10–20 cm) on the eastern slope of Mount Gongga were measured. The results show that δ 13C values of plants, litter and soil organic matter all decrease first and then increase with altitude, i.e. δ 13C values gradually decrease from 1200 to 2100 m a.s.l., and increase from 2100 to 4500 m a.s.l. The δ 13C altitudinal variations are related to the distribution of C3 and C4 plants on the eastern slope of Mount Gongga, because C4 plants are observed to grow only below 2100 m, while C3 plants occur at all altitudes. There are significantly positive correlations among δ 13C of vegetation, δ 13C of litter and δ 13C of soil organic matter, and litter, 0–5 cm, 5–10 cm and 10–20 cm soil organic matter are 0.56‰, 2.87‰, 3.04‰ and 3.49‰ greater in δ 13C than vegetation, respectively. Considering the influences of rising concentration of atmospheric CO2 and decreasing δ 13C of atmospheric CO2 since the industry revolution on δ 13C of plants, 1.57‰ is proposed to be the smallest correction value for reconstruction of paleovegetation using δ 13C of soil organic matter.

关键词：土壤有机质 C3植物贡嘎山东坡 C值碳同位素大气CO2 植被重建

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Biodiversity-ecosystem functioning research in Chinese subtropical forests

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Journal of Plant Ecology 2017年第1期10卷 1-3页

作者： Keping Ma Jin-Sheng He Helge Bruelheide Alexandra-Maria Klein xiaojuan liu Bernhard Schmid State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Department of Ecology College of Environmental SciencesPeking UniversityBeijing 100871China Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle-WittenbergAm Kirchtor 106120 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig DeutscherPlatz 5e04103 LeipzigGermany Chair of Nature Conservation and Landscape Ecology Faculty of Environment and Natural ResourcesUniversity of FreiburgTennenbacher Straße 479106 FreiburgGermany Department of Evolutionary Biology and Environmental Studies and Zürich-Basel Plant Science Center University of ZürichWinterthurerstrasse 190CH-8057 ZürichSwitzerland

Worldwide,forests provide habitat for a large diversity of plants,animals and *** the same time,forest ecosystems are essential providers of multiple ecosystem services important for human ***,the relationship between biodiversity and ecosystem functioning has only been little researched in forests and therefore its role for the functioning of forest ecosystems and their services is not yet *** results from comparable studies in other ecosystems are considered(*** et al.2006),it is conceivable that diverse forests would,for example,grow faster,produce more biomass,store more carbon and better maintain soil fertility and plant-insect interactions and functional stability than less diverse forests or monoculture tree *** hypothesis that biodiversity increases and stabilizes interactions and functions is the common theme of the papers in the present issue of the Journal of Plant Ecology.

关键词： forest fertility soil

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Early positive effects of tree species richness on soil organic carbon accumulation in a large-scale forest biodiversity experiment

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Journal of Plant Ecology 2019年第5期12卷 882-893页

作者： Yin Li Helge Bruelheide Thomas Scholten Bernhard Schmid Zhenkai Sun Naili Zhang Wensheng Bu xiaojuan liu Keping Ma State Key Laboratory of Vegetation and Environmental Change Institute of Botanythe Chinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle-WittenbergAm Kirchtor 106108 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5eD-04103 LeipzigGermany Department of Geosciences Soil Science and GeomorphologyEberhard Karls University TübingenRümelinstrasse 19-2372070 TübingenGermany Department of Geography University of ZürichWinterthurerstrasse 190CH-8057 ZürichSwitzerland Research Institute of Forestry Chinese Academy of ForestryBeijing 100091China College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

Aims tree species richness has been reported to have positive effects on aboveground biomass and productivity,but little is known about its effects on soil organic carbon(SOC)*** to close this gap,we made use of a large biodiversity-ecosystem functioning experiment in subtropical china(BEF-china)and tested whether tree species richness enhanced SOC *** 2010 and 2015,vertically layered soil samples were taken to a depth of 30 cm from 57 plots ranging in tree species richness from one to eight *** squares-based linear models and analysis of variance were used to investigate tree diversity *** equation modeling was used to explore hypothesized indirect relationships between tree species richness,leaf-litter biomass,leaf-litter carbon content,fine-root biomass and SOC *** Findings Overall,SOC content decreased by 5.7 and 1.1 g C kg^(-1) in the top 0-5 and 5-10 cm soil depth,respectively,but increased by 1.0 and 1.5 g C kg^(-1) in the deeper 10-20 and 20-30 cm soil depth,*** SOC content to SOC stocks using measures of soil bulk density showed that tree species richness did enhance SOC accumulation in the different soil *** effects could only to some extent be explained by leaf-litter biomass and not by fine-root *** findings suggest that carbon storage in new forests in china could be increased by planting more diverse stands,with the potential to contribute to mitigation of climate warming.

关键词： BEF-china diversity fine-root biomass leaf-litter biomass soil carbon accumulation

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Traditional soliton erbium-doped fiber laser with InSe as saturable absorber

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Frontiers of Information Technology & Electronic Engineering 2021年第3期22卷 325-333页

作者： xiaojuan liu Guomei WANG Mingxiao ZHU Kezhen HAN Wenfei ZHANG Huanian ZHANG School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Indium selenide(InSe)is a typical layered metal-chalcogenide semiconductor that has potential for developing ultrafast optoelectronic *** this work,InSe-polyvinyl alcohol(InSe-PVA)film is employed as saturable absorber and prepared by mixing InSe nanosheets solution and polyvinyl alcohol *** nonlinear absorption properties of the InSe saturable absorber(InSe-SA)are investigated,showing that the nonsaturable absorption and modulation depth are 37.5%and 9.55%,*** soliton lasers are generated in erbium-doped fiber(EDF)laser-employed InSe as a *** central wavelength and pulse duration of the traditional soliton pulse are 1568.73 nm and 2.06 ps,respectively,under a repetition rate of 1.731 *** maximum average output power is 16.4 mW at the pump power of 413 *** the best of our knowledge,this is the first demonstration of a traditional soliton pulse with InSe as a *** experimental results further demonstrate that InSe is an outstanding nonlinear absorption material in ultrafast fiber laser.

关键词： Fiber laser Nanosheets Traditional soliton

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Weighted Time-Variant Slide Fuzzy Time-Series Models for Short-Term Load Forecasting

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Journal of Intelligent Learning Systems and Applications 2012年第4期4卷 285-290页

作者： xiaojuan liu Enjian Bai Jian’an Fang College of Information Science & Technology Donghua University Shanghai China

Short-term load forecast plays an important role in the day-to-day operation and scheduling of generating units. Season and temperature are the most important factors that affect the load change, but random factors such as big sport events or popular TV shows can change demand consumption in particular hours, which will lead to sudden load changes. A weighted time-variant slide fuzzy time-series model (WTVS) for short-term load forecasting is proposed to improve forecasting accuracy. The WTVS model is divided into three parts, including the data preprocessing, the trend training and the load forecasting. In the data preprocessing phase, the impact of random factors will be weakened by smoothing the historical data. In the trend training and load forecasting phase, the seasonal factor and the weighted historical data are introduced into the Time-variant Slide Fuzzy Time-series Models (TVS) for short-term load forecasting. The WTVS model is tested on the load of the National Electric Power Company in Jordan. Results show that the proposed WTVS model achieves a significant improvement in load forecasting accuracy as compared to TVS models.

关键词： Load Forecasting Fuzzy Time-Series Weighted Slide

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民族文化交流交融下的近代西康图书馆体系建设

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民族学刊 2021年第11期12卷 89-94,131页

作者：刘小娟四川大学历史文化学院四川成都610064

西康地区位于川藏之间,地势险要,是汉、藏、彝等多民族融合地区。民国时期,近代意义的图书馆在西康地区得以建立。刘文辉作为主政西康多年的“西南王”,以发展教育的眼光来加强图书馆建设,建立并完善了由省立图书馆、县级图书馆和各级... 详细信息

西康地区位于川藏之间,地势险要,是汉、藏、彝等多民族融合地区。民国时期,近代意义的图书馆在西康地区得以建立。刘文辉作为主政西康多年的“西南王”,以发展教育的眼光来加强图书馆建设,建立并完善了由省立图书馆、县级图书馆和各级民教馆中的阅览室(图书室)共同构成的西康公共图书馆体系,对西康地区的图书馆事业发展作出了重要贡献。通过对刘文辉与民国时期西康地区图书馆事业发展实践关系的考察,既能丰富我们对刘文辉的研究,也能促进我们对民族地区图书馆事业发展的认识,有助于我们更好地认识西康地区的社会教育情况和更全面地了解民国时期图书馆事业的整体发展状况。

关键词：民国时期西康地区图书馆事业刘文辉

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Passively Q-Switched Erbium-Doped Fiber Laser Based on GeSe Saturable Absorber

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Optics and Photonics Journal 2021年第4期11卷 89-103页

作者： Ying liu Zhifeng Hong xiaojuan liu Ran Zhang Shiliang Yin College of Physics and Optoelectronic Engineering Shandong University of Technology Zibo China

GeSe nanosheets were prepared by ultrasonic-assisted liquid phase exfoliation (LPE), and the nonlinear saturated absorption performance was experimentally studied. The modulation depth and saturation intensity of the prepared GeSe saturable absorber (SA) were 15% and 1.44 MW/cm2, respectively. Using the saturated absorption characteristics of GeSe SA, a passively Q-switched erbium-doped fiber laser was systematically demonstrated. As the pump power increases, the pulse repetition frequency increases from 22.8 kHz to 77.59 kHz. The shortest pulse duration is 1.51 μs, and the corresponding pulse energy is 46.14 nJ. Experimental results show that GeSe nanosheets can be used as high-efficiency SA in fiber lasers. Our results will provide a useful reference for demonstrating pulsed fiber lasers based on GeSe equipment.

关键词： GeSe Nanosheets GeSe Saturable Absorber Passively Q-Switched Erbium-Doped Fiber Laser

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