Advancing phytoremediation of heavy metal–contaminated soils in the Mediterranean basin: Integrating angiosperm diversity, detoxification mechanisms, and biotechnological innovations
摘要
Heavy metal (HM) pollution is a significant global concern that threatens the integrity of ecosystems. The Mediterranean basin, one of the most vulnerable regions, is particularly affected by HM contamination. Phytoremediation has emerged as a sustainable and cost-effective strategy for detoxifying industrial and agricultural waste. The aim of this review is to analyse the main taxa of Mediterranean angiosperms with phytoremediation potential. To this end, a systematic literature review of 58 taxa that could grow and flourish in the Mediterranean basin with phytoremediation potential, categorized into grasses, shrubs, and trees has been carried out. It provides a novel synthesis linking phytoremediation mechanisms with ecological restoration strategies specifically adapted to the Mediterranean Basin, emphasizing the use of heavy metal-tolerant plants in sustainable soil recovery. Hence, the present review is of great interest to the scientific community and the policy-makers dealing with the depollution of Mediterranean HM-contaminated sites. Most of the selected species utilize phytoextraction or phytostabilization techniques, while Phragmites australis (Cav.) Steud., Helichrysum italicum (Roth) G.Don, and Pistacia lentiscus L. can also phytovolatilize arsenic (As), cadmium (Cd), and mercury (Hg) into less toxic forms. Notably, Lupinus albus L. is effective in stabilizing several metals, and species such as Agrostis castellana Boiss. & Reut and Salvia rosmarinus Spenn. demonstrate efficiency in multi-element remediation. Additionally, Cistus monspeliensis L. and Tamarix africana Poir. exhibit significant tolerance to metalliferous soils, while Atriplex halimus L. shows notable Cd and Zn accumulation in saline environments. Innovative approaches, including inoculation with growth-promoting bacteria, application of electric fields, and genetic engineering, have been developed to overcome the limitations of conventional phytoremediation methods. Ultimately, selecting species capable of withstanding unpredictable climatic conditions and leveraging the adaptive traits of Mediterranean plants could significantly enhance the success of phytoremediation projects in the region and beyond.