Gupta Deepak Kumar, Srivastava Alok, Singh V P
Department of Plant Science, Faculty of Applied Sciences, M.J.P. Rohilkhand University, Bareilly 243 006, India.
J Environ Biol. 2008 Nov;29(6):903-6.
Vetiver grass (Vetiveria zizanioides) has strong and dense root system and is a potential phytoremediator plant since it can tolerate a wide range of climatic conditions and grow well in soils contaminated with heavy metals. Soil was artificially contaminated by lead (20 mgl(-1)) during field trials. Four concentration of EDTA (Ethylene diamine tetra acetic acid-disodium salt) solution i.e. 0, 3, 5 and 10 mmol kg(-1) were added to soil prior to harvesting, to study the influence of EDTA solution on phytostabilization by vetiver grass. Results showed that the concentration of lead in roots of vetiver is significantly increased after EDTA solution (5 mmol kg(-1)) application. However, high concentration of EDTA (10 mmol kg(-1)) does not show such significant increase. The toxicity of highly contaminating metal did not affect the growth of vetiver grass significantly but a slight decrease in parameters studied was noticed. No stress symptoms were observed in vetiver plants. Results of present study reveal that vetiver could be considered as a potential phytoremediator for lead contamninated site.
香根草（Vetiveria zizanioides）根系发达且密集，由于它能耐受多种气候条件并在重金属污染土壤中良好生长，所以是一种有潜力的植物修复植物。在田间试验期间，土壤被铅（20 mg l(-1)）人工污染。在收获前，向土壤中添加四种浓度的乙二胺四乙酸（EDTA - 二钠盐）溶液，即0、3、5和10 mmol kg(-1)，以研究EDTA溶液对香根草植物稳定作用的影响。结果表明，施用EDTA溶液（5 mmol kg(-1)）后，香根草根系中的铅浓度显著增加。然而，高浓度的EDTA（10 mmol kg(-1)）并未显示出如此显著的增加。高污染金属的毒性并未对香根草的生长产生显著影响，但在所研究的参数中发现有轻微下降。香根草植株未观察到胁迫症状。本研究结果表明，香根草可被视为铅污染场地的一种潜在植物修复剂。
