자생식물 자귀풀 유식물에 의한 RDX 흡수, 분해 및 식물독성 = Uptake, Degradation and Phytotoxicity of RDX by Indigenous Plant Aeschynomene indica (Indian jointvetch) Seedling

다국어 초록 (Multilingual Abstract)

High explosive compounds such as RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) from military shooting ranges may posehuman health and ecological risks. In pot culture studies, Indian jointvetch (Aeschynomene indica) was evaluated as acandidate indigenous plant species for phytoremediation of RDX. The concentration of RDX ranged from blank to 10,100, 150, 200, 300, and 400 mg/kg, and an Indian jointvetch seedling (approximately 5 cm) was transplanted into a potcontaining shooting range soil. The pot culture lasted for 21 days in a controlled growth chamber. The toxic effects ofRDX, such as necrosis on leaf edges, biomass reduction, and leaf/stem abscission, started with a 100 mg/kg to 400 mg/kgtreatment. The effective concentration (EC50) based on dry weight (n=10 for each treatment) for above-ground, root, andwhole plant was 222.5, 69.6, and 181.4 mg-RDX/kg-soil, respectively. The analysis of RDX in the plant (n = 3) indicateda log-linear relationship between plant and soil RDX concentrations, with 95% of RDX translocated to the above-groundpart. The maximum concentration was 6,259.9 μg/g-DW in the 400 mg-RDX/kg treatment. Furthermore, the cultivation ofIndian jointvetch enhanced RDX removal by over 10% compared to the control group that did not culture the plant.
Therefore, Indian jointvetch is a prominent native plant species for the phytoremediation of RDX at a military shootingrange.