Solanum nigrum mediated remediation of Cd contaminated soil

In recent years, soil cadmium (Cd) pollution has become a serious threat, and remediation of Cd contaminated soil is urgently needed. Because of the rising interest in green and environment-friendly technologies, phytoremediation is one of the most concerned in situ technologies among various remediation methods for heavy metal contaminated soil at present, which designed to use plants to absorb or stabilize the contamination in soil. Thus, proper selection of plants is key to the successful implementation of phytoremediation in the field. The accumulation characteristics and physiological response towards Cd of a typical hyperaccumulator named Solanum nigrum was reviewed in this paper. Moreover, Cd tolerance mechanisms of rhizosphere chelation, compartmentation and antioxidant system of S. nigrum under Cd stress were also discussed. Furthermore, the application of a combined remediation technology using S. nigrum and Cd-curing additives, agronomy measures or microorganisms were analysed, and the emphasis of future research on S. nigrum was proposed to improve the fixation and absorption of Cd in the soil. The discussion in this paper will provide a good reference for the future implementation of phytoremediation in heavy metal contaminated soil.