Green Tea Catechins and Skin Health.

Green tea catechins (GTCs) are a group of bioactive polyphenolic compounds found in fresh tea leaves ( (L.) O. Kuntze).

Impact of utilization of oxygen scavenger on aroma quality of Longjing tea during storage at elevated temperature.

The fresh aroma of Longjing tea is vulnerable to unfavorable storage conditions. However, limited research has addressed effective solutions apart from low-temperature storage. This study aimed to investigate the impact of oxygen scavenger on aroma quality of packaged Longjing tea samples at elevated storage temperatures.

A CCA1-like MYB subfamily member CsMYB128 participates in chilling sensitivity and cold tolerance in tea plants (Camellia sinensis).

While flavonoid accumulation, light radiation, and cold stress are intrinsically connected in tea plants, yet the underlying mechanisms remain elusive. The circadian protein CCA1 and CCA1-like MYB transcription factors (TFs) play important roles in coordinating light and temperature signals in plant-environment interactions, their homologs in tea plants have not been addressed. Here we analyzed CsCCA1-like MYB family in tea genome and found one member, a circadian gene CsMYB128 responding to cold stress.

CsMPDB 1.0: An interactive web application for visualizing and exploring the microRNAs and phasiRNAs of tea plant (Camellia sinensis var. sinensis 'Shuchazao').

The microRNAs and phasiRNAs of plant are small non-coding RNAs with important functions through regulating gene expression at the post-transcriptional level. However, identifying miRNAs, phasiRNAs and their target genes from numerous sequencing raw data requires multiple software and command-line operations, which are time-consuming and labor-intensive for non-model plants. Therefore, we present CsMPDB (miRNAs and phasiRNAs database of Camellia sinensis), an interactive web application with multiple analysis modules developed to visualize and explore miRNA and phasiRNA in tea plants based on 259 sRNA-seq samples and 24 degradome-seq samples in NCBI.

Metabolomics analysis reveals crucial effects of arbuscular mycorrhizal fungi on the metabolism of quality compounds in shoots and roots of Camellia sinensis L.

Arbuscular mycorrhizal fungi (AMF) are known as plants' mutualists to enhance plant growth, but their impact on the quality-related metabolites in Camellia sinensis still needs to be studied. In this study, the 2-year-old potted C. sinensis cv.

CsCIPK20 Improves Tea Plant Cold Tolerance by Modulating Ascorbic Acid Synthesis Through Attenuation of CsCSN5-CsVTC1 Interaction.

Low temperature is a limiting environmental factor for tea plant growth and development. CBL-interacting protein kinases (CIPKs) are important components of the calcium pathway and involved in plant development and stress responses. Herein, we report the function and regulatory mechanisms of a low-temperature-inducible gene, CsCIPK20, in tea plants.

Comparison of the aquatic toxicity of diquat and its metabolites to zebrafish Danio rerio.

Diquat (DQ) is a non-selective, fast-acting herbicide that is extensively used in aquatic systems. DQ has been registered as the substitute for paraquat due to its lower toxicity. However, the widespread presence of DQ in aquatic systems can pose an ecological burden on aquatic organisms.

Involvement of endogenous IAA and ABA in the regulation of arbuscular mycorrhizal fungus on rooting of tea plant (Camellia sinensis L.) cuttings.

Background: Adventitious root (AR) formation is the key step for successful cutting propagation of tea plants (Camellia sinensis L.). Studies showed that arbuscular mycorrhizal fungus (AMF) can promote the rooting ability, and auxin pathway in basal stem of cuttings was involved in this process.

, a R2R3-MYB transcription factor from purple tea (), positively regulates anthocyanin biosynthesis.

In tea (), anthocyanins are important secondary metabolites that are linked to leaf color. Anthocyanin biosynthesis is a complex biological process, in which multiple genes including structural and regulatory genes are involved. Here, we describe the cloning and characterizing of a new R2R3-MYB transcription factor gene, , isolated from purple tea variety ''.

Metabolomic profiling identifies metabolites in the pheromone glands of associated with the synthesis and release of female pheromone signals.

The tea moth pest, is an economically important and highly damaging pest that drastically affects tea plant leaves. The chemical composition of its pheromone glands metabolites before and during calling period has not been reported yet. Therefore, the present study aimed at the metabolomic profiling of female moths' sex pheromones glands before and during calling period using gas chromatography time-of-flight mass spectrometry.

mRNA-miRNA analyses reveal the involvement of CsbHLH1 and miR1446a in the regulation of caffeine biosynthesis in .

Caffeine, a primary flavor component in tea, has been the subject of intense research. With the goal of shedding light on the complex regulatory processes governing caffeine biosynthesis in tea plants, liquid chromatography coupled with mass spectrometry (LC-MS), transcriptomics, and small RNA analyses were employed on diverse tea cultivars such as 'Jianghua Kucha' [including 'Xianghong 3' (XH3H) and 'Kucha 3' (KC3H)], 'Fuding Dabaicha' (FDDB), 'Yaoshan Xiulv' (YSXL), and 'Bixiangzao' (BXZ). The results showed that the caffeine level in 'Jianghua Kucha' was significantly higher than that in other tea plant cultivars.

Analysis of the Changes in Volatile Components During the Processing of Enshi Yulu Tea.

Volatile constituents are critical to the flavor of tea, but the changes in Enshi Yulu tea during the processing have not been clearly understood. Using headspace solid phase microextraction combined with gas chromatography-mass spectrometry (HS-SPME/GC-MS) techniques, we analyze the aroma components of Enshi Yulu tea and changes in them during the processing stages. In total, 242 volatile compounds were identified.

Spectral Fingerprinting of Tencha Processing: Optimising the Detection of Total Free Amino Acid Content in Processing Lines by Hyperspectral Analysis.

The quality and flavor of tea leaves are significantly influenced by chemical composition, with the content of free amino acids serving as a key indicator for assessing the quality of Tencha. Accurately and quickly measuring free amino acids during tea processing is crucial for monitoring and optimizing production processes. However, traditional chemical analysis methods are often time-consuming and costly, limiting their application in real-time quality control.

Research on Rapid Detection Methods of Tea Pigments Content During Rolling of Black Tea Based on Machine Vision Technology.

As a crucial stage in the processing of black tea, rolling plays a significant role in both the color transformation and the quality development of the tea. In this process, the production of theaflavins, thearubigins, and theabrownins is a primary factor contributing to the alteration in color of rolled leaves. Herein, tea pigments are selected as the key quality indicators during rolling of black tea, aiming to establish rapid detection methods for them.

A glutamine synthetase-Dof transcription factor module regulates nitrogen remobilization from source to sink tissues in tea plants.

Nitrogen (N) remobilization from mature leaves to new shoots (NSs) is closely related to the quality of green tea in the spring season, which subsequently determines its economic value. However, the underlying N remobilization mechanism remains poorly understood. Here, we demonstrate that >80% of the recovered 15N was partitioned in the first mature leaves that supply NSs.

Kiwifruit spatiotemporal multiomics networks uncover key tissue-specific regulatory processes throughout the life cycle.

Kiwifruit (Actinidia chinensis), a recently commercialized horticultural crop, is rich in various nutrient compounds. However, the regulatory networks controlling the dynamic changes in key metabolites among different tissues remain largely unknown. Here, high-resolution spatiotemporal datasets obtained by ultraperformance liquid chromatography-tandem mass spectrometry methodology and RNA-seq were employed to investigate the dynamic changes in the metabolic and transcriptional landscape of major kiwifruit tissues across different developmental stages, including from fruit skin, outer pericarp, inner pericarp, and fruit core.

Design, synthesis, molecular docking and antimicrobial evaluation of benzoylurea derivatives containing difluoromethyl (trifluoromethyl) pyrimidine.

Background: The reduction in agricultural product quality and yield caused by fungal and bacterial plant diseases has led to considerable economic losses in global crop production and poses a threat to human health. The primary method of control remains the use of chemical agents. In an effort to develop novel and highly effective antimicrobial agents, a series of benzoylurea derivatives incorporating a difluoromethyl (trifluoromethyl) pyrimidine structure were designed and synthesized.

, a novel cell wall-associated receptor kinase gene from , promotes growth but reduces cold tolerance in .

Cold significantly impacts the growth and development of tea plants, thereby affecting their economic value. Receptor-like kinases (RLKs) are thought to play a pivotal role in signaling the plant's response to cold and regulating cold tolerance. Among the RLK subfamilies, wall-associated receptor-like kinases (WAKs) have been investigated across various plant species and have been shown to regulate cell growth and stress responses.

Authenticating vintage in white tea: Appearance-taste-aroma-based three-in-one non-invasive anticipation.

To safeguard the legal rights of tea enterprises and promote sustainable development in the tea industry, this study proposes a rapid, non-destructive method for authenticating white tea vintages based on the hypothesis that the appearance, taste and aroma cannot be simultaneously replicated in counterfeit teas. Using visible-near infrared hyperspectral imaging, this three-in-one appearance-taste-aroma method was applied to Bai Mudan white tea, produced from the Jinggu Dabai Tea cultivar harvested in 2020, 2021 and 2022. Hyperspectral imaging captured appearance data from dry samples of different vintages, with preprocessing using multiplicative scatter correction (MSC) and standard normal variate (SNV).

Widely targeted metabolomics and SPME-GC-MS analysis revealed the quality characteristics of non-volatile/volatile compounds in Zheng'an Bai tea.

Background: As albino tea under the geographical protection of agricultural products, Zheng'an Bai tea is not only rich in amino acids, polyphenols and other beneficial components for the human body, but also its leaf color will turn green as the temperature gradually rises, thus causing changes in the quality characteristics of tea leaves. However, these changing characteristics have not yet been revealed.

Methods: In-depth quality analysis was carried out on the fresh leaves of Zheng'an Bai tea at four different developmental stages and four samples from the processing stage through extensive targeted metabolomics and SPME-GC-MS analysis.

Another inner truth of shaking: Water migration and transformation-advanced physicochemical alterations in tea leaves.

Shaking, essential in oolong tea production, is becoming an innovative method to impart floral fragrance. Research on shaking primarily concentrates on biological underpinnings, including modifications in gene expression and stress-triggered enzymatic catalysis, and consequent physicochemical properties. Water phase and distribution, reshaped by shaking and affected the biological and physicochemical alterations of tea leaves, is always ignored.

Jianghua Kucha black tea containing theacrine attenuates depression-like behavior in CUMS mice by regulating gut microbiota-brain neurochemicals and cytokines.

Theacrine and theaflavins are known for their potential to mitigate depression and cognitive impairment. Jianghua Kucha black tea (JH) contains both compounds, yet its antidepressant properties are seldom documented. This study evaluated the effects of JH on depression in chronic unpredictable mild stress (CUMS) mice and explored the underlying mechanisms through integrative analyses of gut microbiota and fecal metabolomics.