Wang Cuiping, Ma Chuanxin, Jia Weili, Wang Dong, Sun Hongwen, Xing Baoshan
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA; Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station, New Haven, CT 06504, USA.
Environ Pollut. 2017 Dec;231(Pt 1):68-77. doi: 10.1016/j.envpol.2017.07.094. Epub 2017 Aug 5.
In order to investigate the effects of dissolved humic acid (DHA) and tourmaline on uptake of 2, 2', 4, 4', 5, 5'- hexabrominated diphenyl ether (BDE-153) by Lactuca sativa, different fractions of DHA, including DHA and DHA, as well as different doses of tourmaline were introduced into BDE-153 contaminated solutions for plant growth. The levels of BDE-153 in L. sativa tissues were positively correlated with the Fe levels (R = 0.9264) in seedings of the treatments with different doses of tourmaline. However, when adding DHA and DHA into the system, the correlation coefficients (R) decreased to 0.6976 and 0.5451 from 0.9264, respectively. In contrast with the Fe contents, the presence of DHAs didn't affect the R between the levels of BDE-153 and the lipid contents in plant tissues. Our results indicated that both DHA and DHA could severely alter the BDE-153 uptake by L. sativa through reducing the Fe uptake instead of the lipid contents. Additionally, DHA exhibited much stronger abilities to alter the BDE-153 accumulation than DHA. Transmission electron microscopy (TEM) observations indicated that either DHA or tourmaline or co-treatment with DHA and tourmaline had no negative impact on L. sativa at the cellular level. The present study provides important information for the impacts of different fractions of DHA extracted from soil on the BDE-153 migration in plant systems. Moreover, we elucidated the importance of the iron in tourmaline for migration of the polybrominated diphenyl ethers (PBDEs) in plant systems.
为了研究溶解性腐殖酸（DHA）和电气石对紫花苜蓿吸收2,2',4,4',5,5'-六溴联苯醚（BDE-153）的影响，将不同组分的DHA（包括DHA和DHA）以及不同剂量的电气石添加到受BDE-153污染的溶液中用于植物生长。在不同剂量电气石处理的幼苗中，紫花苜蓿组织中BDE-153的含量与铁含量呈正相关（R = 0.9264）。然而，当向系统中添加DHA和DHA时，相关系数（R）分别从0.9264降至0.6976和0.5451。与铁含量不同，DHA的存在并未影响BDE-153含量与植物组织中脂质含量之间的相关性。我们的结果表明，DHA和DHA均可通过减少铁的吸收而非脂质含量来严重改变紫花苜蓿对BDE-153的吸收。此外，DHA改变BDE-153积累的能力比DHA强得多。透射电子显微镜（TEM）观察表明，单独的DHA或电气石，或DHA与电气石共同处理在细胞水平上对紫花苜蓿均无负面影响。本研究为从土壤中提取的不同组分DHA对植物系统中BDE-153迁移的影响提供了重要信息。此外，我们阐明了电气石中的铁在植物系统中多溴联苯醚（PBDEs）迁移中的重要性。
