School of Environmental Science and Engineering, Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education, Key Laboratory of Environmental Protection & Pollution and Remediation of Water and Soil of Shaanxi Province, Chang'an University, Xi'an 710054, PR China.
School of Environmental Science and Engineering, Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education, Key Laboratory of Environmental Protection & Pollution and Remediation of Water and Soil of Shaanxi Province, Chang'an University, Xi'an 710054, PR China.
J Hazard Mater. 2018 May 5;349:215-223. doi: 10.1016/j.jhazmat.2018.02.002. Epub 2018 Feb 6.
Few studies have explored the long-term effects of elevated atmospheric CO combined with lead (Pb) contamination on plants. The objective of this study was to examine the effects of 3 years of elevated CO (700 ± 23 μmol mol) on Pb accumulation and plant defenses in leaves of Robinia pseudoacacia L. seedlings in exposed to Pb (500 mg kg soil). Elevated CO increased Pb accumulation in leaves and Pb removal rate in soils. In plants exposed to Pb stress, total chlorophyll and carotenoid contents in leaves were lower under elevated CO than under ambient CO, but seedling height and width increased under elevated CO relative to ambient CO. Elevated CO significantly (p < .01) stimulated malondialdehyde content in leaves under Pb exposure. Superoxide dismutase and catalase activity increased significantly (p < .01), peroxidase activity decreased significantly (p < .01), and glutathione, cystine, and phytochelatin contents increased under elevated CO + Pb relative to Pb alone. Elevated CO stimulated the production of soluble sugars, proline, flavonoids, saponins, and phenolics in plants exposed to Pb stress. Ove rall, long-term elevation of CO increased Pb-induced oxidative damage in seedlings, but enhanced the phytoextraction of Pb from contaminated soils.
很少有研究探讨大气 CO 升高与铅（Pb）污染对植物的长期影响。本研究的目的是研究 3 年 CO 升高（700±23μmol mol）对暴露于 Pb（500mg kg 土壤）的刺槐幼苗叶片中 Pb 积累和植物防御的影响。CO 升高增加了叶片中的 Pb 积累和土壤中的 Pb 去除率。在 Pb 胁迫下的植物中，叶片中的总叶绿素和类胡萝卜素含量在 CO 升高下低于大气 CO，而幼苗高度和宽度在 CO 升高下高于大气 CO。CO 升高显著（p<.01）刺激了 Pb 暴露下叶片中的丙二醛含量。超氧化物歧化酶和过氧化氢酶活性显著增加（p<.01），过氧化物酶活性显著降低（p<.01），而谷胱甘肽、胱氨酸和植物螯合肽含量在 CO 升高+Pb 下相对于 Pb 单独处理时增加。CO 升高刺激了 Pb 胁迫下植物中可溶性糖、脯氨酸、类黄酮、皂苷和酚类物质的产生。总体而言，长期 CO 升高增加了 Pb 诱导的幼苗氧化损伤，但增强了从污染土壤中提取 Pb 的能力。
