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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Localization of Fluoride and Aluminum in Subcellular Fractions of Tea Leaves and Roots
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Localization of Fluoride and Aluminum in Subcellular Fractions of Tea Leaves and Roots

机译：氟化物和铝在茶叶和根的亚细胞部分中的定位

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摘要

The tea plant is a fluoride (F) and aluminum (Al) hyperaccumulator. High concentrations of F and Al have always been found in tea leaves without symptoms of toxicity, which may be related to the special localization of F and Al in tea leaves. In this study, we for the first time determined the subcellular localization of F and Al in tea roots and leaves and provided evidence of the detoxification mechanisms of high concentrations of F and Al in tea plants. Results revealed that 52.3 and 71.8% of the total F accumulated in the soluble fraction of tea roots and leaves, and vacuoles contained 98.1% of the total F measured in the protoplasts of tea leaves. Cell walls contained 69.8 and 75.2% of the total Al detected in the tea roots and leaves, respectively, and 73.2% of Al sequestered in cell walls was immobilized by pectin and hemicellulose components. Meanwhile, 88.3% of the Al measured in protoplasts was stored in the vacuoles of tea leaves. Our results suggested that the subcellular distributions of F and Al in tea plants play two important roles in the detoxification of F and Al toxicities. First, most of the F and Al was sequestered in the vacuole fractions in tea leaves, which could reduce their toxicities to organelles. Second, Al can be immobilized in the pectin and hemicellulose components of cell walls, which could suppress the uptake of Al by tea roots.
机译：茶厂是氟化物（F）和铝（Al）的超蓄积剂。茶叶中一直发现高浓度的F和Al，没有中毒症状，这可能与茶叶中F和Al的特殊定位有关。在本研究中，我们首次确定了茶树根和叶片中F和Al的亚细胞定位，并提供了茶树中高浓度F和Al的解毒机理的证据。结果显示，在茶的根和叶的可溶性部分中累积了52.3％和71.8％的总F，并且在茶叶的原生质体中，液泡占总F的98.1％。细胞壁含有分别在茶根和叶中检出的总Al的69.8和75.2％，并且固存在细胞壁中的73.2％的Al被果胶和半纤维素成分固定。同时，在原生质体中测得的Al的88.3％被储存在茶叶的液泡中。我们的结果表明，茶树中F和Al的亚细胞分布在F和Al毒性的解毒中起两个重要作用。首先，大多数F和Al被螯合在茶叶的液泡部分中，这可以降低它们对细胞器的毒性。第二，铝可以固定在细胞壁的果胶和半纤维素成分中，这可以抑制茶根对铝的吸收。

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