Int J Phytoremediation. 2014;16(7-12):704-18. doi: 10.1080/15226514.2013.856844.
Salinity is a major worldwide problem that affects agricultural soils and limits the reclamation of contaminated sites. Despite the large number of research papers published about salt tolerance in Brassica juncea L., there are very few accounts concerning the influence of salinity on the uptake of trace metals. In this study, B. juncea plants divided through soil sets comprising 0, 900 and 1800 mg Zn kg(-1), were treated with solutions containing 0, 60 and 120 mmol L(-1) of NaCl, with the purpose of observing the effect of salt on Zn uptake, and some physiological responses throughout the 90 days experiment. Increasing concentrations of NaCl and Zn produced a decline in the ecophysiological and biochemical properties of the plants, with observable synergistic effects on parameters like shoot dry weight, leaf area, or photochemical efficiency. Nevertheless, plants treated with 60 mmol L(-1) of NaCl accumulated striking harvestable amounts of Zn per plant that largely exceed those reported for Thlaspi caerulescens. It was concluded that salinity could play an important role on the uptake of Zn by B. juncea. The potential mechanisms behind these results are discussed, as well as the implications for phytoremediation of Zn on saline and non-saline soils.
盐度是一个全球性的主要问题，影响农业土壤，并限制了受污染场地的开垦。尽管有大量关于芸薹属植物耐盐性的研究论文发表，但关于盐度对痕量金属吸收的影响的报道却很少。在这项研究中，通过包含 0、900 和 1800 mg Zn kg(-1)的土壤组将芸薹属植物分开，用含有 0、60 和 120 mmol L(-1)的 NaCl 的溶液处理，目的是观察盐对 Zn 吸收的影响以及在 90 天实验过程中的一些生理反应。随着 NaCl 和 Zn 浓度的增加，植物的生态生理学和生物化学特性下降，对像地上干重、叶面积或光化学效率这样的参数产生了明显的协同效应。然而，用 60 mmol L(-1)的 NaCl 处理的植物每株积累了大量可收获的 Zn，远远超过了对 Thlaspi caerulescens 的报道。结论是，盐度可能对芸薹属植物对 Zn 的吸收起重要作用。讨论了这些结果背后的潜在机制，以及对在盐渍和非盐渍土壤中进行 Zn 植物修复的影响。
