Co-Planting Cd Contaminated Field Using HyperaccumulatorSolanum Nigrum L.Through Interplant with Low Accumulation Welsh Onion

Abstract

Monoculture and intercrop of hyperaccumulator Solanum nigrum L. with low accumulation Welsh onion Renbentieganchongwang were conducted. The results showed that the remove ratio of S. nigrum to Cd was about 7% in intercrop plot when top soil (0-20 cm) Cd concentration was 0.45-0.62 mg kg(-1), which did not significantly impact the yield of low accumulation Welsh onion compared to the monoculture. The consistency of remove ratio in practice and theory indicated the remediation of S. nigrum to Cd was significant. The Cd concentration and yield of Welsh onion were not affected by the growth of S. nigrum either in intercrop plot. The Cd concentration in edible parts of Welsh onion was available either. In short, inter-planting hyperaccumulator with low accumulation crop could normally remediate contaminated soil and produce crop (obtain economic benefit), which may be one practical pathway of phytoremediating heavy metal contaminated soil in the future.

Intercropping of Gramineous Pasture Ryegrass (Lolium perenne L.) and Leguminous Forage Alfalfa (Medicago sativa L.) Increases the Resistance of Plants to Heavy Metals

“…* Correlation is significant at p < 0.05 (two-tailed); * * correlation is significant at p < 0.01 (two-tailed). Japanese clover than when the respective crops were grown in monoculture [9,34]. In this study, the ability of heavy metal uptake of ryegrass roots was much higher than that of alfalfa.…”

“…Ryegrass and alfalfa intercropping may form roots interlaced each other to provide a safe living environment for alfalfa to reduce the concentrations of heavy metals in alfalfa. Wang et al [9] found that the intercropping of Pteris vittata L. and faba bean can not only reduce the As content in the soil around the roots of Pteris vittata. L but also reduce the As content in the soil around the roots of faba bean.…”

“…It has been reported that intercropping can not only increase plant biomass but also change the accumulation of heavy metals in plants [8]. Intercropping can also produce agricultural products while cleaning the heavy metal-contaminated soil [9]. Intercropping has been proposed as an alternative to phytostabilization for heavy metal-contaminated soil [10].…”

Cost–benefit calculation of phytoremediation technology for heavy-metal-contaminated soil

“…Moreover, As and Pb hyperaccumulator Pteris vittata (Chen et al, 2002a;Chen et al, 2002b;Ma et al, 2001;Wan et al, 2014) and Cd hyperaccumulator Sedum alfredii Hance (Long et al, 2009;Yang et al, 2004) were used in this type of soil. Intercropping system consisting of hyperaccumulators and cash crops with low HM accumulating abilities (Wang et al, 2015) were designed and established on the lowly contaminated soil to give the local farmers some income during remediation. The total area of the remediation project was 19.5 ha, distributed along the Huanjiang River (Fig.…”

Implementation of Omics Research to Enhance Phytoremediation Efficiency - a Review

“…In one study, researchers compared two species exposed to cadmium -Solanum torvum which does not accumulate significant amounts of cadmium in its tissues and Solanum nigrum which is identified as hyperaccumulator of Cd. Transcriptomic analyses identified a higher expression of multiple genes in S. nigrum which were involved in the transportation of metals and were not expressed in S. torvum [31]. Table 2.…”