Ng Chuck Chuan, Rahman Md Motior, Boyce Amru Nasrulhaq, Abas Mhd Radzi
Faculty of Science, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia.
Faculty of Science, Institute of Biological Sciences, University of Malaya, Kuala Lumpur, Malaysia ; Department of Plant Agriculture, Ontario Agricultural College, University of Guelph, Ontario, Canada.
Springerplus. 2016 Apr 16;5:469. doi: 10.1186/s40064-016-2125-5. eCollection 2016.
The growth response, metal tolerance and phytoaccumulation properties of water spinach (Ipomoea aquatica) and okra (Abelmoschus esculentus) were assessed under different contaminated spiked metals: control, 50 mg Pb/kg soil, 50 mg Zn/kg soil and 50 mg Cu/kg soil. The availability of Pb, Zn and Cu metals in both soil and plants were detected using flame atomic absorption spectrometry. The concentration and accumulation of heavy metals from soil to roots and shoots (edible parts) were evaluated in terms of translocation factor, accumulation factor and tolerance index. Okra recorded the highest accumulation of Pb (80.20 mg/kg) in its root followed by Zn in roots (35.70 mg/kg) and shoots (34.80 mg/kg) of water spinach, respectively. Different accumulation trends were observed with, Pb > Zn > Cu in okra and Zn > Pb > Cu in water spinach. Significant differences (p < 0.01) of Pb, Zn and Cu accumulation were found in both water spinach and okra cultivated among tested treatments. However, only the accumulation of Pb metal in the shoots of water spinach and okra exceeded the maximum permissible levels of the national Malaysian Food Act 1983 and Food Regulations 1985 (2006) as well as the international Codex Alimentarius Commission limits. This study has shown that both water spinach and okra have good potential as Pb and Zn phytoremediators.
在不同的污染加标金属条件下，即对照、50毫克铅/千克土壤、50毫克锌/千克土壤和50毫克铜/千克土壤，评估了空心菜（蕹菜）和秋葵（黄秋葵）的生长响应、金属耐受性和植物积累特性。使用火焰原子吸收光谱法检测土壤和植物中铅、锌和铜金属的有效性。根据转运因子、积累因子和耐受指数评估重金属从土壤到根和地上部（可食用部分）的浓度和积累情况。秋葵根中铅的积累量最高（80.20毫克/千克），其次是空心菜根中锌的积累量（35.70毫克/千克）和地上部锌的积累量（34.80毫克/千克）。在秋葵中观察到不同的积累趋势为铅>锌>铜，在空心菜中为锌>铅>铜。在测试处理中种植的空心菜和秋葵中，铅、锌和铜的积累存在显著差异（p<0.01）。然而，只有空心菜和秋葵地上部的铅金属积累量超过了马来西亚1983年《食品法》和1985年《食品条例》（2006年）以及国际食品法典委员会的最大允许水平。这项研究表明，空心菜和秋葵都具有作为铅和锌植物修复剂的良好潜力。
