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Camellia sinensis

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https://www.readbyqxmd.com/read/29773972/genetic-diversity-and-structure-of-tea-plant-in-qinba-area-in-china-by-three-types-of-molecular-markers
#1
Yu Zhang, Xiaojuan Zhang, Xi Chen, Wang Sun, Jiao Li
Background: Qinba area has a long history of tea planting and is a northernmost region in China where Camellia sinensis L. is grown. In order to provide basic data for selection and optimization of molecular markers of tea plants. 118 markers, including 40 EST-SSR, 40 SRAP and 38 SCoT markers were used to evaluate the genetic diversity of 50 tea plant ( Camellia sinensis. ) samples collected from Qinb. tea germplasm, assess population structure. Results: In this study, a total of 414 alleles were obtained using 38 pairs of SCoT primers, with an average of 10...
2018: Hereditas
https://www.readbyqxmd.com/read/29739590/quantification-of-ascorbyl-adducts-of-epigallocatechin-gallate-and-gallocatechin-gallate-in-bottled-tea-beverages
#2
Wei-Lun Hung, Siyu Wang, Shengmin Sang, Xiaochun Wan, Yu Wang, Chi-Tang Ho
Catechins are the major bioactive compounds existing in tea leaves (Camellia sinensis). Dehydroascorbic acid is (DHAA) a reactive dicarbonyl species and previous studies have demonstrated that catechins could effectively trap DHAA to form ascorbyl adducts of catechins, especially epigallocatechin gallate (EGCG). Since catechins in the aqueous solution are unstable due to their structural features, ascorbic acid (AA) is usually added to bottled tea beverages to protect catechins. However, whether ascorbyl adducts of catechins are formed in bottled tea beverages remains unclear...
September 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29739579/cashew-gum-and-maltrodextrin-particles-for-green-tea-camellia-sinensis-var-assamica-extract-encapsulation
#3
Francisca Silva, Lucicléia Torres, Larissa Silva, Raimundo Figueiredo, Deborah Garruti, Tamara Araújo, Antoniella Duarte, Débora Brito, Nágila Ricardo
Cashew gum and maltodextrin microcapsules containing green tea leaf extracts were made using a spray-dryer. Green tea extracts were submitted to cytotoxicity analysis and characterization of bioactive compounds. Three formulations of microcapsules were performed, which were then submitted to characterization through morphological study, particle diameter and distribution, zeta potential, Exploratory Differential Calorimetry, entrapment efficiency, dissolution test and X-ray diffraction. The extract had a high bioactive compound content and no cytotoxicity was observed...
September 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29734777/a-randomized-placebo-controlled-study-on-the-safety-and-efficacy-of-daily-ingestion-of-green-tea-camellia-sinensis-l-cv-yabukita-and-sunrouge-on-eyestrain-and-blood-pressure-in-healthy-adults
#4
Mari Maeda-Yamamoto, Mie Nishimura, Nobuyoshi Kitaichi, Atsushi Nesumi, Manami Monobe, Sachiko Nomura, Yukihiro Horie, Hirofumi Tachibana, Jun Nishihira
The green tea ( Camellia sinensis L.) cultivar &ldquo;Sunrouge&rdquo; contains anthocyanins, catechins and flavonols. To determine whether ingesting green tea containing anthocyanins improves visual function and blood pressure (BP) in healthy adults, a randomized, double-blind, placebo-controlled study was performed. A total of 120 healthy subjects, aged between 20 and 60 years and with a systolic BP (SBP) value of &le;125 and <155 and a diastolic BP (DBP) value <95, or a DBP of &le;75 mmHg and <95 mmHg and a SBP <155 mmHg, were randomly assigned to one of three groups...
May 6, 2018: Nutrients
https://www.readbyqxmd.com/read/29729015/photoprotective-effects-of-a-multifunctional-hair-care-formulation-containing-botanical-extracts-vitamins-and-uv-filters
#5
Marcella Gabarra Almeida Leite, Patricia M B G Maia Campos
The aim of this study was to develop and evaluate the efficacy of a multifunctional hair care formulation - Hair BB Cream - containing botanical extracts of Camellia sinensis, Vitis vinifera and Euterpe orleacea, vitamins, amino acids, UV filters and silicones for hair treatment and prevention of UV damages. The in vitro antioxidant activity of the botanical extracts was evaluated using the DPPH and chemiluminescence methods. A tensile test, combability, shine and image analysis were performed to evaluate the efficacy of the formulation...
May 4, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29726968/characterization-and-alternative-splicing-profiles-of-lipoxygenase-gene-family-in-tea-plant-camellia-sinensis
#6
Junyan Zhu, Xuewen Wang, Lingxiao Guo, Qingshan Xu, Shiqi Zhao, Fangdong Li, Xiaomei Yan, Shengrui Liu, Chaoling Wei
Oxylipins, including jasmonic acid (JA) and volatiles, are important for signaling in plants, and these are formed by the Lipoxygenases (LOX) enzyme family. There is a large gap in understanding of the underlying molecular basis of their roles in tea plants. Here, we identified eleven CsLOX genes from tea plant (Camellia sinensis), and characterized their phylogeny, gene structure and protein features into three subclasses. We then examined their enzymatic activities, LOX expression and alternative splicing of transcripts during development and in response to abiotic or biotic stresses in tea plants...
May 2, 2018: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29722013/effect-of-shading-intensity-on-morphological-and-color-traits-and-chemical-components-of-new-tea-camellia-sinensis-l-shoots-under-direct-covering-cultivation
#7
Tomohito Sano, Hideki Horie, Akiko Matsunaga, Yuhei Hirono
BACKGROUND: Use of covering cultivation to shade tea (Camellia sinensis L.) trees to produce high-quality, high-priced green tea has recently increased in Japan. Knowledge of shading effects on morphological and color traits, and chemical components of new tea shoots is important for product quality and productivity. We assessed these traits of tea shoots and their relationships under covering cultivation of various radiation intensities. RESULTS: Leaf thickness, LMA (leaf mass per area), and leaf density of new tea leaves were smaller under covering culture than under open-field culture...
May 2, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29695246/transcriptomic-analysis-between-self-and-cross-pollinated-pistils-of-tea-plants-camellia-sinensis
#8
Qingping Ma, Changsong Chen, Zhongping Zeng, Zhongwei Zou, Huan Li, Qiongqiong Zhou, Xuan Chen, Kang Sun, Xinghui Li
BACKGROUND: Self-incompatibility (SI) is a major barrier that obstructs the breeding process in most horticultural plants including tea plants (Camellia sinensis). The aim of this study was to elucidate the molecular mechanism of SI in tea plants through a high throughput transcriptome analysis. RESULTS: In this study, the transcriptomes of self- and cross-pollinated pistils of two tea cultivars 'Fudingdabai' and 'Yulv' were compared to elucidate the SI mechanism of tea plants...
April 25, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29678829/draft-genome-sequence-of-camellia-sinensis-var-sinensis-provides-insights-into-the-evolution-of-the-tea-genome-and-tea-quality
#9
Chaoling Wei, Hua Yang, Songbo Wang, Jian Zhao, Chun Liu, Liping Gao, Enhua Xia, Ying Lu, Yuling Tai, Guangbiao She, Jun Sun, Haisheng Cao, Wei Tong, Qiang Gao, Yeyun Li, Weiwei Deng, Xiaolan Jiang, Wenzhao Wang, Qi Chen, Shihua Zhang, Haijing Li, Junlan Wu, Ping Wang, Penghui Li, Chengying Shi, Fengya Zheng, Jianbo Jian, Bei Huang, Dai Shan, Mingming Shi, Congbing Fang, Yi Yue, Fangdong Li, Daxiang Li, Shu Wei, Bin Han, Changjun Jiang, Ye Yin, Tao Xia, Zhengzhu Zhang, Jeffrey L Bennetzen, Shancen Zhao, Xiaochun Wan
Tea, one of the world's most important beverage crops, provides numerous secondary metabolites that account for its rich taste and health benefits. Here we present a high-quality sequence of the genome of tea, Camellia sinensis var. sinensis (CSS), using both Illumina and PacBio sequencing technologies. At least 64% of the 3.1-Gb genome assembly consists of repetitive sequences, and the rest yields 33,932 high-confidence predictions of encoded proteins. Divergence between two major lineages, CSS and Camellia sinensis var...
April 20, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29669412/novel-flavoalkaloids-from-white-tea-with-inhibitory-activity-against-formation-of-advanced-glycation-end-products
#10
Xiao Li, Guang-Jin Liu, Wei Zhang, Yv-Long Zhou, Tie-Jun Ling, Xiao-Chun Wan, Guan-Hu Bao
Two novel flavoalkaloids, (-)-6-(5'''S)-N-ethyl-2-pyrrolidinone-epigallocatechin -O-gallate (ester-type catechins pyrrolidinone A, etc-pyrrolidinone A, 1), (-)-6-(5'''R)-N-ethyl-2-pyrrolidinone-epigallocatechin-O-gallate (etc-pyrrolidinone B,2) and new naturally occurring flavoalkaloids (-)-8-N-ethyl-2-pyrrolidinone-epigallocatechin-O-gallate (etc-pyrrolidinone C,3a and etc- pyrrolidinone D,3b), were isolated from white tea (Camellia sinensis). Their structures were identified by extensive NMR spectra...
April 18, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29667128/epigallocatechin-3-gallate-protects-and-prevents-paraquat-induced-oxidative-stress-and-neurodegeneration-in-knockdown-dj-1-%C3%AE-drosophila-melanogaster
#11
Daniel A Martinez-Perez, Marlene Jimenez-Del-Rio, Carlos Velez-Pardo
Epigallocatechin-3-gallate (EGCG) is a polyhydroxyphenol constituent of green tea (e.g., Camellia sinensis) with known antioxidant properties. Due to these properties, others have proposed it as a potential therapeutic agent for the treatment of Parkinson's disease (PD). Previously, we demonstrated that EGCG prolonged the lifespan and locomotor activity in wild-type Canton-S flies exposed to the neurotoxicant paraquat (PQ), suggesting neuroprotective properties. Both gene mutations and environmental neurotoxicants (e...
April 17, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29658565/-%C3%A2-%C3%A2-epicatechin-protects-against-myocardial-ischemia%C3%A2-induced-cardiac-injury-via-activation-of-the-pten-pi3k-akt-pathway
#12
Jia-Wen Li, Xiao-Yun Wang, Xin Zhang, Lei Gao, Li-Feng Wang, Xin-Hua Yin
Flavonol (‑)‑epicatechin (EPI) is primarily contained in green tea (Camellia sinensis) and cocoa beans (Theobroma cacao), and has been demonstrated to be beneficial for the health of the cardiovascular system. However, the effect and the underlying mechanism of EPI on myocardial ischemia induced cardiac injury has not yet been determined. Therefore, the present study aimed to detect whether EPI inhibited myocardial ischemia injury. An in vivo mouse myocardial ischemia model was induced by the ligation of left descending coronary artery for 7 days...
April 12, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29655745/study-of-the-biochemical-formation-pathway-of-aroma-compound-1-phenylethanol-in-tea-camellia-sinensis-l-o-kuntze-flowers-and-other-plants
#13
Ying Zhou, Qiyuan Peng, Lanting Zeng, Jinchi Tang, Jianlong Li, Fang Dong, Ziyin Yang
After tea leaves, tea (Camellia sinensis) flowers are becoming a second tea plant resource because they contain not only functional metabolites similar to those found in tea leaves, but also predominant amounts of functional metabolites that only occur in tea leaves in small amounts. 1-Phenylethanol (1PE) is a predominant aroma compound found in tea flowers. A 1PE synthase in tea flowers was isolated, functionally characterized, and shown to have the highest catalytic efficiency for the conversion of acetophenone (AP)...
August 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29652443/identification-of-key-aromatic-compounds-in-congou-black-tea-by-plsr-with-variable-importance-of-projection-scores-and-gas-chromatography-mass-spectrometry-gas-chromatography-olfactometry
#14
Shihong Mao, Changqi Lu, Meifeng Li, Yulong Ye, Xu Wei, Huarong Tong
BACKGROUND: Gas chromatography-olfactometry (GC-O) is the most frequently used method to estimate the sensory contribution of single odorant, but disregards the interactions between volatiles. In order to select the key volatiles responsible for the aroma attributes of Congou black tea (Camellia sinensis), instrumental, sensory and multivariate statistical approaches were applied. RESULTS: By sensory analysis, nine panelists developed 8 descriptors, namely, floral, sweet, fruity, green, roasted, oil, spicy, and off-odor...
April 13, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29651641/transcriptome-wide-identification-and-expression-profile-analysis-of-the-bhlh-family-genes-in-camellia-sinensis
#15
Xin Cui, Yong-Xin Wang, Zhi-Wei Liu, Wen-Li Wang, Hui Li, Jing Zhuang
The tea plant is an important commercial horticulture crop cultivated worldwide. Yield and quality of this plant are influenced by abiotic stress. The bHLH family transcription factors play a pivotal role in the growth and development, including abiotic stress response, of plants. A growing number of bHLH proteins have been functionally characterized in plants. However, few studies have focused on the bHLH proteins in tea plants. In this study, 120 CsbHLH TFs were identified from tea plants using computational prediction method...
April 12, 2018: Functional & Integrative Genomics
https://www.readbyqxmd.com/read/29627466/a-polysaccharide-from-green-tea-camellia-sinensis-l-protects-human-retinal-endothelial-cells-against-hydrogen-peroxide-induced-oxidative-injury-and-apoptosis
#16
Yitao Yan, Yanfan Ren, Xinmin Li, Xinxia Zhang, Huiqing Guo, Yutong Han, Junxi Hu
Oxidative damage of retinal pigment epithelium (RPE) cells is involved in the pathogenesis age related macular degeneration (AMD). The purpose of this study was to evaluate the potential protective effect of a purified green tea polysaccharide (GTWP) against hydrogen peroxide (H2 O2 ) induced oxidative stress and apoptosis in human retinal pigment epithelial cells (ARPE-19 cells). Human ARPE-19 cells were treated with 1 h of 500 μM H2 O2 before incubation with GTWP for 24 h. Pretreatment of GTWP decreased H2 O2 -induced cell death and cell apoptosis, and efficiently suppressed the intracellular ROS production and malondialdehyde (MDA) generation induced by H2 O2 treatment...
April 5, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29619229/transcriptional-analysis-and-histochemistry-reveal-that-hypersensitive-cell-death-and-h-2-o-2-have-crucial-roles-in-the-resistance-of-tea-plant-camellia-sinensis-l-o-kuntze-to-anthracnose
#17
Yuchun Wang, Xinyuan Hao, Qinhua Lu, Lu Wang, Wenjun Qian, Nana Li, Changqing Ding, Xinchao Wang, Yajun Yang
Anthracnose causes severe losses of tea production in China. Although genes and biological processes involved in anthracnose resistance have been reported in other plants, the molecular response to anthracnose in tea plant is unknown. We used the susceptible tea cultivar Longjing 43 and the resistant cultivar Zhongcha 108 as materials and compared transcriptome changes in the leaves of both cultivars following Colletotrichum fructicola inoculation. In all, 9015 and 8624 genes were differentially expressed between the resistant and susceptible cultivars and their controls (0 h), respectively...
2018: Horticulture Research
https://www.readbyqxmd.com/read/29616437/tea-plant-sweet-transporters-expression-profiling-sugar-transport-and-the-involvement-of-cssweet16-in-modifying-cold-tolerance-in-arabidopsis
#18
Lu Wang, Lina Yao, Xinyuan Hao, Nana Li, Wenjun Qian, Chuan Yue, Changqing Ding, Jianming Zeng, Yajun Yang, Xinchao Wang
Thirteen SWEET transporters were identified in Camellia sinensis and the cold-suppression gene CsSWEET16 contributed to sugar compartmentation across the vacuole and function in modifying cold tolerance in Arabidopsis. The sugars will eventually be exported transporters (SWEET) family of sugar transporters in plants is a recently identified protein family of sugar uniporters that contain seven transmembrane helices harbouring two MtN3 motifs. SWEETs play important roles in various biological processes, including plant responses to environmental stimuli...
April 3, 2018: Plant Molecular Biology
https://www.readbyqxmd.com/read/29616373/ethylene-signaling-modulates-contents-of-catechin-and-ability-of-antioxidant-in-camellia-sinensis
#19
Shun-Wun Ke, Guan-Heng Chen, Chung-Tse Chen, Jason T C Tzen, Chin-Ying Yang
BACKGROUND: Tea is one of the most popular beverages in the world. There are many secondary metabolites can be found in tea such as anthocyanins, proanthocyanidins, flavonols and catechins. These secondary metabolites in plants are proved to act protective components for human health effect. Plant hormone ethylene is considered to have an important role in regulation of plant development and signal transduction. This study evaluated the effect of ethylene signaling regulation in phenolic compounds in tea plants...
April 3, 2018: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/29614315/a-novel-pharmacological-activity-of-caffeine-in-the-cholinergic-system
#20
Camila Fabiani, Ana Paula Murray, Jeremías Corradi, Silvia Susana Antollini
Cholinergic deficit is regarded as an important factor responsible for Alzheimer's disease (AD) symptoms. Acetylcholinesterase (AChE) and nicotinic receptor (AChR) are two molecular targets for the treatment of this disease. We found here that methanolic extracts of Camellia sinensis exhibited anticholinesterase activity and induced AChR conformational changes. From bioguided fractionation we confirmed that caffeine was the active compound exerting such effects. It is well-known that caffeine acts as an inhibitor of AChE and here we explored the effect of caffeine on the AChR by combining single channel recordings and fluorescent measurements...
March 31, 2018: Neuropharmacology
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