Surface runoff quantity and quality were measured during three experiments with different pollutant loads. The objectives of this study were to understand the mechanisms of citrus Mn-tolerance and to identify differentially expressed genes, which might be involved in Mn-tolerance. More highly resistant plants can be selected especially for a remediation of the pollution site. "Merlin" is a monocotyledonous grass species isolated from a zinc and lead mine area. These evidences suggested that MT-like gene was present in both "Merlin" and "S59" cultivars of Festuca rubra; the expression of the MT-like gene was induced by heavy metal stress, and the expression pattern was different between the tolerant ("Merlin") and the sensitive ("S59") cultivars. Processes include using plants that tolerate and accumulate metals at high levels (phytoextraction) and using plants that can grow under conditions that are toxic to other plants while preventing, for example, soil erosion (phytostabilization). In order to integrate depollution goals, the design of SUDS, currently based on exceptional events, should also rely on frequent events. This chapter addresses key research, potential benefits and limitations, and the potential future needs for phytoremediation. Acta Botanica Sinica 39 (6) 522-526 (In TOXIC EFFECTS OF HEAVY METALS ON CROP PLANTS GROWN IN SOIL CULTURE. National Center for Biotechnology Information, Unable to load your collection due to an error, Unable to load your delegates due to an error. Chinese with English abstract), Accumulation and distribution of Cu and Zn in mycorrhizal Pinus sylvestris and its associated ectomycorrhizal fungus Suillus bovines exposed to elevated Cu and Zn concentration in cultivating substrates, Huang Y, Tao S, Chen Y, et al. Four Red Tip Photinia (Photinia × fraseri Dress) trees and two Blueberry Muffin Hawthorn (Rhaphiolepis umbellata (Thunb.) But, there are also studies on plant resistance mechanisms to protect plants against the toxic effects of heavy metals such as combining heavy metals by proteins and expressing of detoxifying enzyme and nucleic acid, these mechanisms are integrated to protect the plants against injury by heavy metals. ... Mining and refining of metal ores have been reported to cause severe contamination by heavy metals in areas where the mining activities are carried out (Jiang et al., 2004). Guaiacol peroxidase activity as one of the parameters expressing oxidative damage and extent of stress in plants was not generally found to be significantly affected under the presence of metals in most plants suggesting that the extent of stress in plants was minimal, while only for plants treated with the metal mixture and low salinity the enzyme activity was elevated confirming that this enzyme serves as an antioxidative tool against the reactive oxygen species produced by the metals. Molecular understanding on the metal tolerant ability of "Merlin" was studied. composting by plants. The plants were treated with 200 μM and 400 μM of nickel sulphate (NiSO4) solution. We assessed the potential health risks in a lead-zinc mining area and attempted to identify the key exposure pathways. The photosynthetic efficiency of Cornus controversa leaves was decreased significantly under Cd treatment while it was not affected by Pb exposure. Implications of metal accumulation mechanisms to phytoremediation. On the other hand, plants have their own resistance mechanisms against toxic effects and for detoxifying heavy metal pollution. Effects of heavy metals on plants result in growth inhibition, structure damage, a decline of physiological and biochemical activities as well as of the function of plants. The amount of adsorbed Pb in four crops is decreased by 23.4-57.8%, and that of Cu and Zn is slightly decreased. Along with dust other pollutants such as heavy metals may also be transferred which pose a risk to human health. Five different soilless growing media comprising of CD alone and as mixtures of CD and peat [CDP]; CD and OPF compost A (CDC a); CD and OPF compost B (CDC b); CD and OPF compost C (CDC c) were evaluated in a tropical humid planthouse. were 100 mg x kg(-1) and Cr6+ concentration was 50 mg x kg(-1). Although not a new concept, phytoremediation is currently being re-examined as an environmentally friendly, cost-effective means of reducing metal contaminated soil and other substrates throughout North America and Europe. 1 (5) 85-88 (In Chinese with English abstract), Environmental sources of Pb and Cd and their toxicity to man and animals, Guo D (1994): Environmental sources of Pb and Cd and their toxicity to man and animals. While heavy metals are toxic to plants, plants also resist the toxicity of heavy metals through t he mechanism of avoidance and tolerance. These suggested that polyubiquitin might play important roles in resistance to heavy metals and various environmental stresses. We also identified many new Mn-toxicity-responsive genes involved in biological and signal transduction, carbohydrate and protein metabolisms, stress responses and cell transport. 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