Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
J Hazard Mater. 2012 Feb 29;205-206:131-8. doi: 10.1016/j.jhazmat.2011.12.051. Epub 2011 Dec 26.
Lead (Pb) has great toxicity to human beings and other livings. Although there are varied ways to rehabilitate the Pb contaminated area, phytoremediation of Pb pollution in arid lands is still a difficult task, it is therefore urgent to find and identify Pb tolerant plants in arid areas. The physiological responses and tolerance mechanisms to Pb stress (expressed as the Pb concentration, e.g., 0, 50, 150, 300, 600, 800, 1000 mg/L) were investigated for the xerophils Salsola passerina Bunge and Chenopodium album L. Results indicated that S. passerina exhibited higher Pb tolerance than Ch. album in terms of the seed germination rate, bio-activities of SOD and POD, and lower MDA production. There were two ways for S. passerina to reduce Pb toxicity in organism level, e.g., cell wall precipitation and state transfer of free Pb into anchorage. These findings demonstrate that S. passerina is a Pb tolerant species and may have potential application in phytoremediation of Pb contaminated arid lands.
铅（Pb）对人类和其他生物具有很大的毒性。尽管有多种方法可以修复 Pb 污染区域，但干旱地区的 Pb 污染植物修复仍然是一项艰巨的任务，因此迫切需要在干旱地区寻找和鉴定耐 Pb 植物。本文研究了旱生植物盐角草（Salsola passerina Bunge）和藜（Chenopodium album L.）对 Pb 胁迫（用 Pb 浓度表示，如 0、50、150、300、600、800、1000mg/L）的生理响应和耐受力机制。结果表明，盐角草的种子发芽率、SOD 和 POD 活性以及 MDA 产量均高于藜，表现出更高的耐 Pb 能力。盐角草在机体水平上降低 Pb 毒性有两种方式，即细胞壁沉淀和游离 Pb 向锚定状态的转化。这些发现表明盐角草是一种耐 Pb 物种，可能在 Pb 污染干旱地区的植物修复中有潜在应用。
