Journal of Tea Science Research, 2024, Vol.14, No.1, 1-9 http://hortherbpublisher.com/index.php/jtsr 6 garden soil and the microbial communities within tea leaves have been found to regulate catechin synthesis through metabolic activities (Lu et al., 2018). Some studies have found that rhizosphere microorganisms in tea garden soil interact with tea tree roots to promote catechin synthesis. These rhizosphere microorganisms participate in the biosynthesis and metabolism of catechins by secreting enzymes such as tannase and catechin oxidase (Zhang, 2022). At the same time, the microbial community in tea can also affect the composition and content of catechins through metabolic activities. Microorganisms during tea fermentation play an important role in the synthesis of catechins in Biluochun tea. The metabolites of microorganisms during fermentation react with catechins in tea and change the composition and structure of catechins. These metabolites may have antioxidant properties and have a positive effect on the quality and health function of tea. 4.2 Effects of environmental factors on microbially mediated catechin synthesis In addition to the role of microbial communities, environmental factors also play an important role in microbially mediated catechin synthesis (Zheng et al., 2016). Studies have shown that soil pH, temperature, humidity and other environmental factors have regulatory effects on microbial growth and metabolic activities, and then affect microbially mediated catechin synthesis. The pH and Redox (oxidation-reduction reaction) state of the soil in the tea garden have important effects on the growth and metabolic activities of microorganisms (Figure 2). Suitable soil pH and REDOX state are conducive to the reproduction and metabolism of beneficial microorganisms, thus promoting the synthesis of catechins. In addition, temperature and humidity are also important factors affecting microbial activity, and suitable temperature and humidity conditions are conducive to microbially mediated catechin synthesis process. Figure 2 Tea plant 4.3 Novel insights into microbial interactions with tea plants Recent research has also revealed new insights into the interactions between microorganisms and tea plants. The symbiotic relationship between tea plant roots and soil microorganisms is considered a crucial regulatory factor in catechin synthesis. Certain symbiotic microorganisms have the ability to decompose organic matter and provide nutrients for tea plant roots, thereby promoting catechin synthesis. The microbial community inside tea tree also has an important impact on catechin synthesis, and the microbial community inside tea regulates the synthesis and transformation process of catechin through
RkJQdWJsaXNoZXIy MjQ4ODYzNA==