Aluminium alters mineral composition and polyphenol metabolism in leaves of tea plants (Camellia sinensis).,Journal of Inorganic Biochemistry

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Aluminium alters mineral composition and polyphenol metabolism in leaves of tea plants (Camellia sinensis).
Journal of Inorganic Biochemistry ( IF 3.8 ) Pub Date : 2019-12-12 , DOI: 10.1016/j.jinorgbio.2019.110956
Roser Tolrà ₁ , Soledad Martos ₁ , Roghieh Hajiboland ₂ , Charlotte Poschenrieder ₁

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Tea plants (Camellia sinensis) can hyperaccumulate and tolerate high leaf concentrations of aluminium (Al). The quality of tealeaves and the positive health effects of their infusion depend on the leaf concentrations of both polyphenolic substances and mineral elements. This study explored the influence of Al supply on these leaf components under low and optimal phosphorus (P) availability. After 8 weeks exposure in hydroponics, multifactorial analysis revealed a negative influence of leaf Al on magnesium (Mg), P, boron (B), and manganese (Mn) leaf concentrations. Contrastingly, these essential mineral nutrients were positively related to leaf epigallocatechin. Galloylated catechins were positively related to leaf iron (Fe). After short-term exposure (24 and 96 h), RT-qPCR (Reverse Transcription-quantitative Polymerase Chain Reaction) analysis revealed upregulation of galloylation-related genes by substrate acidification both in old and young leaves. Only the extremely high Al accumulation in old leaves activated genes involved in biosynthesis of galloylated catechins, while in young leaves the lower Al leaf concentrations activated genes involved in anthocyanin accumulation. In conclusion, low pH and enhanced Al availability to tea plants have a strong influence on the polyphenolic pattern of tealeaves and therefore may alter both the leaves' antioxidant properties and their ability to bind Al and Fe in non-toxic form.

中文翻译：

铝改变茶树叶片的矿物质组成和多酚代谢。

茶树（茶花）可以过度积累并耐受高浓度的铝叶。茶叶的质量及其注入对健康的正面影响取决于叶片中多酚类物质和矿物质元素的浓度。这项研究探讨了在低磷和最佳磷（P）利用率下，铝供应对这些叶片成分的影响。在水培法中暴露8周后，多因素分析显示叶片Al对镁（Mg），P，硼（B）和锰（Mn）叶片浓度具有负面影响。相反，这些必需的矿物质养分与叶表没食子儿茶素正相关。镀锌儿茶素与叶铁（Fe）呈正相关。短期接触（24和96小时）后，RT-qPCR（逆转录定量聚合酶链反应）分析显示，通过底物酸化，在老叶和幼叶中，与没食子酸酯化相关的基因上调。仅在老叶中极高的铝积累激活了与没食子酸儿茶素的生物合成有关的基因，而在幼叶中，较低的铝叶浓度激活了涉及花青素积累的基因。总而言之，低pH值和增加的铝对茶树的利用对茶树的多酚模式有很大的影响，因此可能会改变叶子的抗氧化特性以及它们以无毒形式结合铝和铁的能力。仅在老叶中极高的铝积累激活了与没食子儿茶素的生物合成有关的基因，而在幼叶中，较低的铝叶浓度激活了与花青素积累有关的基因。总而言之，低pH值和增加的铝对茶树的利用对茶树的多酚模式有很强的影响，因此可能会改变叶子的抗氧化性能以及它们以无毒形式结合铝和铁的能力。仅在老叶中极高的铝积累激活了与没食子酸儿茶素的生物合成有关的基因，而在幼叶中，较低的铝叶浓度激活了涉及花青素积累的基因。总而言之，低pH值和增加的铝对茶树的利用对茶树的多酚模式有很强的影响，因此可能会改变叶子的抗氧化性能以及它们以无毒形式结合铝和铁的能力。

更新日期：2019-12-13

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