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Ultramafic areas are critical for nickel (Ni) phytomining due to the high concentration of this element in their soils and the number of hyperaccumulators they harbor. The aim of the present study was to evaluate the potential of the Morais massif, an ultramafic area in Portugal, for phytomining using the hyperaccumulator species Alyssum serpyllifo...
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Context 1
... 1 presents the main geological composition of the Morais massif. Resources 2019, 8 , x FOR PEER REVIEW 3 of 11 paragneisses, eclogites, mafic granulites, pyroxenites, and peridotites. Figure 1 presents the main geological composition of the Morais massif. ...Context 2
... physicochemical properties of the soil collected in different sampling sites are presented in Table 1. All soil samples exhibit an approximately neutral to slightly acidic pH (6.8-6.4), ...Context 3
... soil pH affects the solubility of trace elements and therefore is considered a major factor influencing Ni bioavailability (metal bioavailability dwindles with increasing pH) [32]. According to the results presented in Table 1, site number 1 shows a significantly higher pH value in comparison to the other sampling sites, meaning the soil is less acidic and consequently Ni is less bioavailable. This is in conformity with the results presented in Figure 3. Hence, the greater bioavailability of Ni in sites 2 and 4 may be explained by the lower pH values at both points (particularly at the latter). ...Citations
... Em 2019, realizou-se um estudo para determinar as concentrações de Ni nos solos e o rendimento da espécie A. pintodasilvae em vários locais ao longo do maciço de Morais (Alves et al., 2019). As concentrações de Ni obtidas nos solos variaram entre os 721 e 2092 mg kg -1 e a concentração máxima de Ni obtida nas folhas da planta foi de 9545 mg kg -1 . ...
The ever-growing demand for metals has been fueling the development of alternative technologies to recover elements of interest from subeconomic deposits. One such example is phytomining, a technique that employs plants with the ability to accumulate astonishing amounts of metals in their tissues. These plants, called hyperaccumulators, can be used to retrieve metals such as Ni or Au from ultramafic soils and mine tailings, respectively. The rhizosphere of hyperaccumulators is often populated by large amounts of microorganisms mainly consisting of bacteria and mycorrhizal fungi. These microorganisms can enhance plant biomass production, reduce metal phytotoxicity, and increase the bioavailability of certain elements of interest. In this chapter, we review the role of bacteria and mycorrhizal fungi in phytomining and outline future perspectives of their application to enhance this green metal–recovery technique.
