茶树是一种富含氟(F)的植物,导致人们非常关注从茶树上喝茶的安全性(茶树(L.)昆兹)。茶树是一种多年生采叶作物,中国的茶叶生产通常被归类为春茶,夏季茶和秋季茶在其年度生长轮回。然而,对叶片中F含量和积累的季节性动态变化及其饮用安全性知之甚少。在这项研究中,调查了85个在相同条件下栽培的茶树品种,分析了F含量的季节变化及其与F积累的关系,铝(Al),幼叶中的钙(Ca)和锰(Mn)以及危险商(HQ)(一芽两叶,YL)和成熟叶(冠层叶,ML).YL中的平均F含量和积累分别为350mgkg-1和203gha-1,它们在ML中分别为2451mgkg-1和2578gha-1,分别,F主要积累在ML中。随着生长季节的发展,F含量显示YL逐渐增加,而ML的减少,推断F可能从成熟的叶子重新分配到幼叶。此外,适合加工乌龙茶的茶品种F含量差异较大,绿茶,和红茶,乌龙茶品种的F积累高于绿茶和红茶品种。此外,茶树品种的地理起源会明显影响F含量和积累,富氟矿带品种的F含量明显高于其他地区。此外,F含量和积累量与Al、Mn含量呈显著正相关(p<0.05)。基于每天8.7克的茶叶消费量,对总部进行了调查,结果表明,春季生产的HQ<1的茶叶比例,85个品种的夏秋嫩叶为100%,90.6%和50.6%,分别,表明饮用安全性最好的茶来自春天,接下来是夏天,然后是秋天。这一结果表明,有必要避免在萤石矿区种植茶树,选择低F茶树品种,控制鲜叶的嫩度,以保证饮茶安全。
Tea tree is a
fluorine (F)-enriched plant, leading to much concern about the safety of drinking tea from tea tree (Camellia sinensis (L.) Kuntze). Tea tree is a perennial leaf-harvested crop, and tea production in
China is generally categorized as spring tea, summer tea and autumn tea in its annual growth rounds. However, the seasonally dynamic changes of F content and accumulation in the leaves and its drinking safety are poorly understood. In this study, 85 tea varieties cultivated under the same conditions were investigated to analyze the seasonal variation of F content and it\'s relationships with F accumulation, aluminum (Al), calcium (Ca) and manganese (Mn) and hazard quotient (HQ) in young leaves (one bud and two leaves, YL) and mature leaves (canopy leaves, ML). The average F contents and accumulations were 350 mg kg-1 and 203 g ha-1 in YL, and they were 2451 mg kg-1 and 2578 g ha-1 in ML, respectively, with F mainly accumulated in ML. As the growing season progresses, the F content showed a gradual increase in YL, while a decrease in ML, inferring that F may be redistributed from mature leaves to young leaves. Additionally, the F content was quite different among tea varieties which are suitable for processing oolong tea, green tea, and black tea, with higher F accumulation in oolong tea varieties than in green and black tea varieties. Moreover, F content and accumulation could be obviously affected by the geographical origin of the tea tree varieties, with significantly higher F content in the varieties from F rich fluorite belts than other regions. Furthermore, F content and accumulation showed a significant positive correlation with the content of Al and Mn (p < 0.05). Based on a daily tea consumption of 8.7 g, the HQ was investigated to show that the proportion of tea leaves with HQ<1 made from spring, summer and autumn tender leaves of 85 varieties was 100 %, 90.6 % and 50.6 %, respectively, indicating that the tea with the best drinking safety comes from spring, followed by summer, and then autumn. This result suggests that it could be necessary to avoid planting tea trees in fluorite mining areas, choose low F tea tree varieties, and control the tenderness of fresh leaves in order to ensure the safety of tea drinking.