Saeng-Ngam Sukhumaporn, Jampasri Kongkeat
Department of Biology, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand.
Bull Environ Contam Toxicol. 2022 Apr;108(4):762-767. doi: 10.1007/s00128-021-03401-6. Epub 2022 Jan 8.
This study aimed to investigate the effects of drought stress on cadmium (Cd) and zinc (Zn) accumulation in Chromolaena odorata grown in an artificially contaminated nutrient solution for 15 days. Polyethylene glycol (5% PEG) was used as a drought stressor. The presence of PEG did not affect the chlorophyll content and photochemical efficiency, while drought stress induced by PEG caused a decrease in water content in the plant tissues. The bioaccumulation factor (BAF) of Cd were higher than the BAF of Zn and accumulated mainly in the roots of C. odorata. The highest concentrations (4273.7 mg/kg Cd, 2135.4 mg/kg Zn) were found in the 20 mg/L treatment. The results suggested that Cd and Zn accumulation in C. odorata was not affected by PEG, while a translocation factor (TF) value < 1 was caused by either PEG or contaminants. Based on the hydroponic BAF criterion, the study confirmed that C. odorata was useful for phytoremediation of Cd with low drought stress.
本研究旨在调查干旱胁迫对在人工污染营养液中生长15天的飞机草中镉（Cd）和锌（Zn）积累的影响。聚乙二醇（5% PEG）用作干旱胁迫因子。PEG的存在不影响叶绿素含量和光化学效率，而PEG诱导的干旱胁迫导致植物组织含水量降低。Cd的生物累积系数（BAF）高于Zn的BAF，且主要积累在飞机草的根部。在20 mg/L处理中发现了最高浓度（4273.7 mg/kg Cd，2135.4 mg/kg Zn）。结果表明，飞机草中Cd和Zn的积累不受PEG影响，而PEG或污染物导致转运系数（TF）值<1。基于水培BAF标准，该研究证实飞机草在低干旱胁迫下对Cd的植物修复有用。
