Francato Zancheta Ariana Carramaschi, De Abreu Cleide Aparecida, Zambrosi Fernando César Bachiega, de Magalhães Erismann Norma, Andrade Lagôa Ana Maria Magalhães
a Instituto Agronômico (IAC) , Pós-Graduação em Agricultura Tropical e Subtropical , Campinas , SP , Brasil.
Int J Phytoremediation. 2015;17(1-6):298-303. doi: 10.1080/15226514.2014.883492.
Among the technologies used to recuperate cadmium (Cd) contaminated soils, phytoextraction are particularly important, where the selection of suitable plants is critical to the success of the soil remediation. Thus, the objectives of this study were to evaluate the responses of jack-bean and sorghum to Cd supply and to quantify Cd accumulation by these species grown in hydroponic culture. The plants were subjected to 0, 15, 30, or 60 μmol Cd L(-1) in the nutrient solution, and gas exchange, plant growth and Cd accumulation were measured at 25 days after starting Cd treatments. The Cd supply severely reduced growth of shoots and roots in both species. In jack-bean, Cd decreased photosynthesis by 56-86%, stomatal conductance by 59-85% and transpiration by 48-80%. The concentrations and amounts of Cd accumulated in the plant tissues were proportional to the metal supply in the nutrient solution. Sorghum was more tolerant than jack-bean to Cd toxicity, but the latter showed a greater metal concentration and accumulation in the shoot. Therefore, jack-bean would be more suitable than sorghum for use in Cd phytoremediation programs based on phytoextraction.
在用于修复镉（Cd）污染土壤的技术中，植物提取尤为重要，其中选择合适的植物对于土壤修复的成功至关重要。因此，本研究的目的是评估刀豆和高粱对镉供应的反应，并量化这些物种在水培中生长时的镉积累量。在营养液中使植物分别暴露于0、15、30或60 μmol Cd L⁻¹，在开始镉处理25天后测量气体交换、植物生长和镉积累情况。镉供应严重降低了两个物种地上部和根部的生长。在刀豆中，镉使光合作用降低了56 - 86%，气孔导度降低了59 - 85%，蒸腾作用降低了48 - 80%。植物组织中积累的镉浓度和含量与营养液中的金属供应量成正比。高粱比刀豆对镉毒性更具耐受性，但刀豆在地上部显示出更高的金属浓度和积累量。因此，基于植物提取的镉植物修复计划中，刀豆比高粱更适合使用。
