Liang Yabo, Zhou Li, Zhang Xinzhong, Yu Huan, Guo Mingming, Yu Jiawei, Wang Xinru, Yang Mei, Lou Zhengyun, Luo Fengjian, Sun Hezhi, Chen Zongmao
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China.
Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China.
J Agric Food Chem. 2021 Apr 28;69(16):4655-4662. doi: 10.1021/acs.jafc.1c01270. Epub 2021 Apr 15.
Perchlorate, emerging pollution with thyroid toxicity, has a high detection rate in fresh tea leaves. What needs attention is that the uptake characteristic is insufficiently understood. Herein, the uptake, accumulation, and translocation of perchlorate in a tea plant-hydroponic solution system were investigated, of which the mechanism was further lucubrated by subcellular distribution. The perchlorate concentration in tea tissues is ramped up along with the increase in the exposure level and time. The bioaccumulation factor of tea tissues followed the rank: mature leaves > tender leaves > roots. After the seedlings have been transplanted to a perchlorate-free solution, the perchlorate in mature leaves is reduced significantly, accompanied by a progressive increase in perchlorate in new shoots and solutions. The cell-soluble fractions are the major reservoir of perchlorate both for roots (>59%) and leaves (>76%), which precisely explained the translocation within the tea plant-hydroponic solution system. These results not only illuminate the uptake characteristic in tea plants but also improve the understanding of the behavior of perchlorate in higher plants.
高氯酸盐是一种具有甲状腺毒性的新兴污染物，在鲜茶叶中检出率较高。需要注意的是，其吸收特性尚不清楚。在此，研究了茶树水培溶液体系中高氯酸盐的吸收、积累和转运，并通过亚细胞分布进一步深入探讨了其机制。茶树组织中的高氯酸盐浓度随着暴露水平和时间的增加而升高。茶树组织的生物富集系数排序为：成熟叶＞嫩叶＞根。将幼苗移植到无高氯酸盐溶液中后，成熟叶中的高氯酸盐显著降低，同时新梢和溶液中的高氯酸盐逐渐增加。细胞可溶性组分是根（＞59%）和叶（＞76%）中高氯酸盐的主要储存库，这准确解释了茶树水培溶液体系中的转运情况。这些结果不仅阐明了茶树的吸收特性，还增进了对高氯酸盐在高等植物中行为的理解。
