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tea

英语世界 2018年第8期 127-128页

作者： Freddie Gay

tea and Britain—a short history Britons are well known for the amount of tea that they *** average person in the UK consumes around 1.9kg of tea ***’s around 876cups of *** is drunk by all sections of *** tea does not grow in *** vast majority of tea is grown in India and ***,how did it become an important part of British culture?tea arrived in London in the *** this time

关键词： tea

tea plant (Camellia sinensis) lipid metabolism pathway modulated by tea field microbe (Colletotrichum camelliae) to promote disease

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Horticulture Research 2023年第3期10卷 110-123页

作者： Shouan Liu Shuhan Zhang Shengnan He Xiaoyan Qiao A.Runa Laboratory of tea and Medicinal Plant Biology College of Plant SciencesJilin UniversityChangchun 130062China Laboratory of Molecular Plant Pathology College of Plant SciencesJilin UniversityChangchun 130062China Guangdong Provincial Key Laboratory of tea Plant Resources Innovation and Utilization Guangdong Academy of Agricultural Sciences Tea Research InstituteGuangzhou 510640China

tea is one of the most popular healthy and non-alcoholic beverages *** anthracnose is a disease in tea mature leaves and ultimately affects yield and *** camelliae is a dominant fungal pathogen in the tea field that infects tea plants in *** pathogenic factors of fungus and the susceptible factors in the tea plant are not *** this work,we performed molecular and genetic studies to observe a cerato-platanin protein CcCp1 from ***,which played a key role in fungal pathogenicity.CcCp1 mutants lost fungal virulence and reduced the ability to produce *** and metabolome were then performed and analysed in tea-susceptible and tea-resistant cultivars,Longjing 43 and Zhongcha 108,upon *** wild-type CCA andCcCp1 infection,*** differentially expressed genes and the differentially accumulated metabolites in tea plants were clearly overrepresented such as linolenic acid and linoleic acid metabolism,glycerophospholipid metabolism,phenylalanine biosynthesis and metabolism,biosynthesis of f lavonoid,f lavone and f lavonol *** particular,the accumulation of jasmonic acid was significantly increased in the susceptible cultivar Longjing 43 upon CCA infection,in the fungal CcCp1 protein dependent manner,suggesting the compound involved in regulating fungal *** addition,other metabolites in the glycerophospholipid and phenylalanine pathway were observed in the resistant cultivar Zhongcha 108 upon fungal treatment,suggesting their potential role in defense *** together,this work indicated *** CcCp1 affected the tea plant lipid metabolism pathway to promote disease while the lost function of CcCp1 mutants altered the fungal virulence and plant response.

关键词： field metabolism tea

tea Polyphenols Reducing Lipopolysaccharide-induced Inflammatory Responses in RAW264.7 Macrophages via NF-κB Pathway

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Chemical Research in Chinese Universities 2019年第6期35卷 1105-1110页

作者： SU Siyi LI Xiaoyu GUO Xu ZHOU Ruiming LI Manman MING Pengfei HUANG Yingying Sajid Ur RAHMAN DING Hongyan FENG Shibin LI Jinchun WANG Xichun LI Yu WU linjie College of Animal Science and Techmology Anhui Agricultural UniversityHefei 230036P.R.China

The anti-inflammatory activity of tea polyphenols(TPs)in RAW264.7 macrophages stimulated by lipopolysaccharide(LPS)was investigated in this ***264.7 macrophages were treated with different concentrations of TP(0,12.5,25,50,100,and 200μg/mL)and then stimulated by *** blank control group was set *** expression of pro-inflammatory cytokines associated with the nuclear factor-kappa B(NF-κB)signaling pathway was investigated before and after TP *** of RAW264.7 cells with TP decreased the expression of tumor necrosis factor-α(TNF-α),interleukin-6(IL-6)and interleukin 1 beta(IL-1β)pro-inflammatory *** addition,TP inhibited the phosphorylation of p65 and IκB by blocking the phosphorylation and the degradation of NF-κB inhibitor *** conclusion,TP exerts anti-inflammatory effects by regulating the release of inflammatory mediators via the NF-κB signaling pathway.

关键词： tea polyphenol Inflammatory response,RAW264.7 Nuclear factor-kappa B pathway

tea consumption and risk of stroke:a dose-response meta-analysis of prospective studies

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第8期13卷 652-662页

作者： Li SHEN Liu-guang SONG Hong MA Chun-na JIN Jian-an WANG Mei-xiang XIANG Department of Cardiology the Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009China Cardiovascular Key Lab of Zhejiang Province the Second A3filiated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009China

Objective:To determine the association between tea consumption and the risk of stroke. Methods:We searched the PubMed database from January 1966 to March 2012 and reviewed reference lists of retrieved articles to identify relevant studies. Studies were included if they reported relative risks (RRs) and corresponding 95% confidence intervals (CIs) of stroke with respect to three or more categories of tea consumption. A random-effects model was used to combine the study-specific risk estimates. Results:Fourteen studies, consisting of 513 804 participants with a median follow-up of 11.5 years, were included in this meta-analysis. We observed a modest but statistically significant inverse association between tea consumption and risk of stroke. An increase of three cups/d in tea consumption was associated with a 13% decreased risk of stroke (RR 0.87; 95% CI, 0.81-0.94). The decreased risk of stroke with tea consumption was consistent among most subgroups. Based on the three studies that provided results for stroke subtypes, tea consumption was also inversely associated with the risk of ischemic stroke (RR 0.76; 95% CI, 0.69-0.84), but not cerebral hemorrhage (RR 0.96; 95% CI, 0.82-1.11) or subarachnoid hemorrhage (RR 0.81; 95% CI, 0.57-1.16). Conclusions:tea consumption is associated with a decreased risk of stroke, particularly ischemic stroke. More well-designed, rigorously conducted studies are needed in order to make confident conclusions about the association between tea consumption and stroke subtypes.

关键词： tea Stroke Prospective studies Dose-response meta-analysis

Effect of Rare Earths on Composition and Activities of Rare Earth Elements Binding Glycoprotein in tea

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Journal of Rare Earths 2001年第2期19卷 125-128页

作者：汪东风李俊赵贵文王常红魏正贵尹明 Univ Sci & Technol China Dept Chem Hefei 230026 Peoples R China Anhui Agr Univ Key Lab Tea Biotechnol Agr Minist Peoples Republ China Hefei 230026 Peoples R China Anhui Med Univ Inst Clin Pharmacol Hefei 230032 Peoples R China Chinese Acad Geol Sci Inst Rock & Mineral Anal Beijing 100037 Peoples R China

The effects of spraying rare earths(RE) on composition and activities of tea polysaccharide were measured by inductively coupled plasma mass spectrometry (ICP-MS), gas chromatography(GC), amino acid analyzer and animal models. The results show that there are rare earth elements binding glycoprotein in tea (REE-TGP). The effects of RE on composition and content of saccharides in REE-TGP are not obvious. The contents of Hypro and Ser in REE-TGP are evidently enhanced in comparison with that in control (not treated with rare earth), but the content of Glu is smaller than that from control. The content of La in REE-TGP from the tea garden sprayed rare earth is 193% higher than that in control. REE-TGP declines content of blood sugar in mice and enhances immunization of rat, which are very evident when the animals are treated by REE-TGP from the tea garden sprayed RE.

关键词： rare earths tea rare earth binding tea glycoprotein

Reactions of tea polyphenol four constituents with hydroxyl radical: A pulse radiolytic study

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Science China Chemistry 1998年第3期41卷 295-300页

作者：姜岳姚思德林维真林念芸朱大元 1. Laboratory of Radiation Chemistry Shanghai Institute of Nuclear Research Chinese Academy of Sciences 201800 Shanghai China 2. Shanghai Institute of Materia Medica Chinese Academy of Sciences 200031 Shanghai China

Using the electron pulse radiolytic techniques, the reactions between hydroxyl radical and tea polyphenol four constituents epigallocatechin gallate (EGCG), epicatechin gallate (ECG), epigallocatechin (EGC) and epicatechin (EC) have been investigated in detail, their corresponding rate constants for scavenging hydroxyl radicals have been determined to be 1.5 × 1010, 1.4 × 1010, 9.7 × 109and 9.2 x 109 dm3-mol?1-s?1, respectively. On the basis of their structures and transient absorption spectra, the OH adducts of EGCG and ECG undergo unimolecular elimination of gallate group.

关键词： electron pulse radiolysis hydroxyl radical transient absorption spectra tea polyphenol.

Identification of miRNAs and their targets in tea (Camellia sinensis)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第10期14卷 916-923页

作者： Quan-wu ZHU Yao-ping LUO Institute of tea Science Zhejiang University

MicroRNAs(miRNAs) are endogenous small RNAs playing a crucial role in plant growth and development,as well as stress *** them,some are highly evolutionally conserved in the plant kingdom,this provide a powerful strategy for identifying miRNAs in a new ***(Camellia sinensis) is one of the most important commercial beverage crops in the world,but only a limited number of miRNAs have been *** the present study,a total of 14 new *** miRNAs were identified by expressed sequence tag(EST) analysis from 47 452 available *** *** miRNAs potentially target 51 mRNAs,which can act as transcription factors,and participate in stress response,transmembrane transport,and signal *** of gene ontology(GO),based on these targets,suggested that 37 biological processes were involved,such as oxidation-reduction process,stress response,and *** Encyclopedia of Genes and Genomes(KEGG) pathway enrichment analysis inferred that the identified miRNAs took part in 13 metabolic *** study will help further understanding of the essential roles of miRNAs in *** growth and development,and stress response.

关键词： MicroRNA(miRNA) Camellia sinensis tea Gene ontology Pathway

Efficacy of tea polyphenols(TP 50) against radiation-induced hematopoietic and biochemical alterations in beagle dogs

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Journal of Traditional Chinese Medicine 2019年第3期39卷 324-331页

作者： Dong Xianzhe Wang Dongxiao Han Jichun Luo Qingliang Guo Daihong Liu Ping Yan Can Hu Yuan Department of Clinical Pharmacology General Hospital of Chinese People's Liberation ArmyBeijing 100853China Institute of Radiation Medicine Academy of Military Medical Sciences Beijing 100850 China Center of Drug Security Chinese People's Liberation Army General Hospital Beijing 100853 China Department of Basic Theory of Chinese Medicine School of Pre-clinical Medicine Guangzhou University of Chinese Medicine Guangzhou 510060 China The Research Centre of Basic Integrative Medicine Guangzhou University of Chinese Medicine Guangzhou 510060 China

OBJECTIVE:To investigate the radioprotective ef fect of tea polyphenols(TP 50)against radiation-in duced organ and tissue ***:Beagle dogs were exposed to a single acute dose of whole-body y-radiation(3 Gy)and orally administered TP 50(80 or 240 mg·kg-1·d-1)for 28 consecutive days.A hemogram was obtained from experimental dogs every other day for 42 *** the end of the experiment,enzyme activities of the antioxidants superoxide-dismutase and glutathione peroxidase,serum levels of inflammatory cytokines(tumor necrosis factor-a,interleukin-1β,and interleukin-6),colony-forming units of bone marrow hematopoietic progenitor cells,and organ coefficients were ***:Dogs exposed to γ-radiation alone exhibited typical hematopoietic *** contrast,irradiated dogs that received TP 50 exhibited an improved blood profile with reduced leucopenia,thrombocytopenia(platelet counts),and reticulocyte *** 50 also significantly elevated levels of the endogenous antioxidant enzyme superoxide-dismutase,reduced the increased levels of serum cytokine in response to radiation-induced toxicity,and increased colony-forming units of bone marrow hematopoietic progenitor *** addition,TP 50 repaired radiation-induced organ ***:The current findings suggest that oral administration of TP 50 to beagle dogs effectively alleviated hematopoietic bone marrow damage induced by y-radiation.

关键词： tea Polyphenols Radiation Beagle dogs Hematopoietic system Cytokines

Efficient iron plaque formation on tea(Camellia sinensis) roots contributes to acidic stress tolerance

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Journal of Integrative Plant Biology 2019年第2期61卷 155-167页

作者： Xianchen Zhang Honghong Wu Lingmu Chen Yeyun Li Xiaochun Wan State Key Laboratory of tea Plant Biology and Utilization Anhui Agricultural University Department of Botany and Plant Sciences University of California

tea plants grow in acidic soil, but to date, their intrinsic mechanisms of acidic stress tolerance have not been elucidated. Here, we assessed the tea plant response to growth on NHt4 nutrient media having different p H and iron levels. When grown in standard NHt4 nutrient solution(iron insufficient, 0.35 mg Là1 Fe2t), tea roots exhibited significantly lower nitrogen accumulation, plasma membrane Ht-ATPase activity, and protein levels; net Htefflux was lower at pH 4.0 and 5.0 than at pH 6.0. Addition of30 mg Là1 Fe2t(iron sufficient, mimicking normal soil Fe2tconcentrations) to the NHt4 nutrient solution led to more efficient iron plaque formation on roots and increased root plasma membrane Ht-ATPase levels and activities at p H 4.0 eland 5.0, compared to the p H 6.0 condition. Furthermore,plants grown at pH 4.0 and 5.0, with sufficient iron,exhibited significantly higher nitrogen accumulation than those grown at pH 6.0. Together, these results support the hypothesis that efficient iron plaque formation, on tea roots, is important for acidic stress tolerance. Furthermore,our findings establish that efficient iron plaque formation is linked to increased levels and activities of the tea root plasma membrane Ht-ATPase, under low pH conditions.

关键词： ATPase PM Efficient iron plaque formation on tea Figure Fe