Ornamental plants for the phytoremediation of heavy metals: Present knowledge and future perspectives

Khan, Aqib Hassan Ali; Kiyani, Amna; Mirza, Cyrus Raza; Butt, Tayyab Ashfaq; Barros, Rocío; Ali, Basit; Iqbal, Mazhar; Yousaf, Sohail

doi:10.1016/j.envres.2021.110780

Cited by 116 publications

(53 citation statements)

References 152 publications

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“…However, what was interesting about our results was that the amount of Cd detected in plants in impatiens was the highest at 1 mg•kg −1 , 2~4 times higher than that of other plant species (Table 5). Impatiens was known as a hyperaccumulator of heavy metal and has a better ability to absorb heavy metals than petunia [41]. Our study supports the study that plant species have different capacities to absorb heavy metals.…”

Section: Heavy Metals In Plantssupporting

confidence: 88%

Seed Germination and Seedling Growth of Four Bedding Plants in Substrate Containing Coal Bottom Ash Mixed with Coir Dust

2021

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Coal bottom ash (BA) is a by-product of coal-fired power generation and can be utilized as a growing substrate for ornamental plants. The physical and hydraulic properties of BA-mixed substrates (coir dust:BA, 10:0, 9:1, 8:2, 7:3, and 6:4, v/v) and commercial germinating media (BM2; Berger Peatmoss) were investigated, and the effects of the substrate mixtures on seed germination, seedling growth, and heavy metal concentrations (Cd and Pb) were evaluated for four common bedding plants (periwinkle (Catharanthus roseus), globe amaranth (Gomphrena globose), impatiens (Impatiens walleriana), and petunia (Petunia multiflora)). As the BA:coir dust increased, the air space rate in the substrate increased from 25.5 to 28.0%, providing the substrate with sufficient porosity. However, the container capacity and amount of easily available water decreased from 63.1 to 53.7% as BA proportions increased. In the final germination percentage and days to germination of the four bedding plants, no significant differences were detected among the substrate mixtures. Although the impatiens and petunias displayed poor growth (46–55% and 42–56% of dry weight, respectively) in the BA-mixed substrates compared to the BM2, no apparent differences in the seedling growth of periwinkles and globe amaranths were found between 7:3 (coir dust:BA) substrate and BM2. These results indicated that the BA-mixed substrates had the potential to replace the commercial germinating media. The plants grown in the BA-mixed substrates contained Cd, but it was unlikely to be derived from the BA.

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Section: Heavy Metals In Plantssupporting

confidence: 88%

Seed Germination and Seedling Growth of Four Bedding Plants in Substrate Containing Coal Bottom Ash Mixed with Coir Dust

2021

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“…In addition to returning the landscape beauty, ornamental trees improve air (by carbon sequestration) and soil quality (dendroremediation) (Turkyilmaz et al 2018), promote protection of local fauna and thermal equilibrium by the release of water vapor (Fig. 1E-H), with the advantage of using biomass for wood, or pulp and paper production (Khan et al 2021). In summary, the use of ornamental plants has gained attention for the reclaim of trace elements from contaminated areas, especially in urban environments, where they constitute a more viable option, promoting the improvement of aesthetics and cleanliness and landscape infrastructure.…”

Section: Trace Elementsmentioning

confidence: 99%

“…On the other hand, the polyculture can lead to the death of plants due to competition and greater production of biomass from some species, making it difficult to develop the other species in the consortium (Dell'Osbel et al 2020).). Nevertheless, the polyculture system offers an advantage because the large production of biomass after phytoremediation may be used as plant pots, cut flowers, essential oils, perfumes, among others such as phytomining and biofuel production (Khan et al 2021). Organic compounds must be metabolized or even fully mineralized in plant tissues, leading to their transformation in less toxic compounds, which may allow the commercialization of flowers or foliage of ornamental plants.…”

Section: Organic Contaminantsmentioning

confidence: 99%

Phytoremediation by ornamental plants: a beautiful and ecological alternative

Rocha

Kochi

et al. 2021

Environ Sci Pollut Res

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Phytoremediation is an eco-friendly and economical technology in which plants are used for the removal of contaminants presents in the urban and rural environment. One of the challenges of the technique is the proper destination of the biomass of plants. In this context, the use of ornamental plants in areas under contamination treatment improves landscape, serving as a tourist option and source of income with high added value. In addition to their high stress tolerance, rapid growth, high biomass production, and good root development, ornamental species are not intended for animal and human food consumption, avoiding the introduction of contaminants into the food web in addition to improving the environments with aesthetic value. Furthermore, ornamental plants provide multiple ecosystem services, and promote human well-being, while contributing to the conservation of biodiversity. In this review, we summarized the main uses of ornamental plants in phytoremediation of contaminated soil, air, and water. We discuss the potential use of ornamental plants in constructed buffer strips aiming to mitigate the contamination of agricultural lands occurring in the vicinity of sources of contaminants. Moreover, we underlie the ecological and health benefits of the use of ornamental plants in urban and rural landscape projects. This study is expected to draw attention to a promising decontamination technology combined with the beautification of urban and rural areas as well as a possible alternative source of income and diversification in horticultural production.

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“…The reported literature shows that ornamental plants are essential from an aesthetic and economic point of view. There is minimal systematic identification for ornamental plants that can be used for remediation applications [13]. In many populous cities, ornamental plants can remediate environmental pollution and beautify the surrounding environment [14].…”

Section: Introductionmentioning

confidence: 99%

Metal Accumulation Profile of Catharanthus roseus (L.) G.Don and Celosia argentea L. with EDTA Co-Application

et al. 2021

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The problem of metal-induced toxicity is proliferating with an increase in industrialization and urbanization. The buildup of metals results in severe environmental deterioration and harmful impacts on plant growth. In this study, we investigated the potential of two ornamental plants, Catharanthus roseus (L.) G.Don and Celosia argentea L., to tolerate and accumulate Ni, Cr, Cd, Pb, and Cu. These ornamental plants were grown in Hoagland’s nutrient solution containing metal loads (50 µM and 100 µM) alone and in combination with a synthetic chelator, ethylenediaminetetraacetic acid (EDTA) (2.5 mM). Plant growth and metal tolerance varied in both plant species for Ni, Cr, Cd, Pb, and Cu. C. roseus growth was better in treatments without EDTA, particularly in Ni, Cr, and Pb treatments, and Pb content increased in all parts of the plant. In contrast, Cd content decreased with EDTA addition. In C. argentea, the addition of EDTA resulted in improved plant biomass at both doses of Cu. In contrast, plant biomass reduced significantly in the case of Ni. In C. argentea, without EDTA, root length in Cd and Cu treatments was significantly lower than the control and other treatments. However, the addition of EDTA resulted in improved growth at both doses for Pb and Cu. Metal accumulation in C. argentea enhanced significantly with EDTA addition at both doses of Cu and Cd. Hence, it can be concluded that EDTA addition resulted in improved growth and better metal uptake than treatments without EDTA. Metal accumulation increased with EDTA addition compared to treatments without EDTA, particularly for Pb in C. roseus and Cu and Cd in C. argentea. Based on the present results, C. roseus showed a better ability to phytostabilize Cu, Cd, and Ni, while C. argentea worked better for Ni, Cd, Cu, and Pb.

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Ornamental plants for the phytoremediation of heavy metals: Present knowledge and future perspectives

Cited by 116 publications

References 152 publications

Seed Germination and Seedling Growth of Four Bedding Plants in Substrate Containing Coal Bottom Ash Mixed with Coir Dust

Seed Germination and Seedling Growth of Four Bedding Plants in Substrate Containing Coal Bottom Ash Mixed with Coir Dust

Phytoremediation by ornamental plants: a beautiful and ecological alternative

Metal Accumulation Profile of Catharanthus roseus (L.) G.Don and Celosia argentea L. with EDTA Co-Application

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