UFRPE - Depto. de Agronomia, R. Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
J Photochem Photobiol B. 2013 Oct 5;127:88-93. doi: 10.1016/j.jphotobiol.2013.07.016. Epub 2013 Jul 24.
The vegetation of metal-contaminated soils using non-edible crops can be a safe and economical technique for Cd immobilization and the remediation of contaminated sites. Jatropha (Jatropha curcas L.) exhibits a relative tolerance to heavy metals and potential for biofuel production. The study was performed to monitor the Cd-induced alterations in jatropha plants by X-ray chlorophyll fluorescence. The Cd effects on photosynthetic pigments, the mineral composition of plants, defense enzyme activity and soluble proteins were also studied. Plants were grown for 20days in a nutrient solution with five Cd contents: 5, 10, 20, 30 and 40μmolL(-1); a control with no Cd addition was also monitored. The analysis of the chlorophyll fluorescence spectra allowed detecting alterations caused by Cd toxicity in the jatropha plants. The mineral composition of the plants was affected by the Cd doses; however, the Fe and Mg contents were not significantly reduced, which most likely improved the effects on the contents of the photosynthetic pigments. Because of its relative tolerance to Cd, Jatropha curcas may be a promising species to revegetate Cd-contaminated sites. Considering the long period needed to phytoremediate soils, the combination of remediation with bioenergy production could be an attractive option.
利用非食用作物来修复受金属污染的土壤是一种安全且经济的方法，可以固定 Cd 并修复受污染的场地。麻疯树（Jatropha curcas L.）对重金属具有相对耐受性，并且具有生产生物燃料的潜力。本研究通过 X 射线叶绿素荧光监测 Cd 对麻疯树植物的诱导变化。还研究了 Cd 对光合作用色素、植物矿物质组成、防御酶活性和可溶性蛋白质的影响。将植物在含有五种 Cd 含量的营养液中生长 20 天：5、10、20、30 和 40μmolL(-1)；还监测了无 Cd 加入的对照。分析叶绿素荧光光谱可以检测到 Cd 毒性对麻疯树植物造成的变化。植物的矿物质组成受到 Cd 剂量的影响；然而，Fe 和 Mg 的含量没有明显降低，这很可能改善了对光合作用色素含量的影响。由于其对 Cd 的相对耐受性，麻疯树可能是一种有前途的物种，可以在 Cd 污染的场地进行植被恢复。考虑到修复土壤所需的时间较长，与生物能源生产相结合可能是一个有吸引力的选择。
