Rhizoremediation of Metal(loid)-Contaminated Soils

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Response to Abiotic Stress and Climate Change".

Deadline for manuscript submissions: closed (30 October 2023) | Viewed by 1752

Special Issue Editors

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Guest Editor
CBQF—Centro de Biotecnologia e Química Fina—Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Diogo Botelho 1327, 4169-005 Porto, Portugal
Interests: environmental biotechnology; phytoremediation; phytomanagement; microbial assisted phytotechnological approaches; plant-microbe interactions; soil health; development of bioinoculant formulations; effects of climate change and related abiotic stresses on plant growth and development
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Guest Editor
1. Laboratoire de Bioressources et Sécurité Sanitaire des Aliments, Faculté des Sciences et Techniques, Université Cadi-Ayyad, B.P. 549, Gueliz, Marrakech M-40000, Morocco
2. Center of Excellence for Soil and Fertilizer Research in Africa, AgroBioSciences, Lot 660, Mohammed VI Polytechnic University, Hay Moulay Rachid, Ben Guerir, Morocco
Interests: environmental science; soil pollution; urban soils; mining soils; metal(loid)s pollution; soil microbiology; bioremediation; phytoremediation; environmental toxicity tests

Special Issue Information

Dear Colleagues,

Soil contamination has become a global threat, and therefore, remediation of polluted areas using efficient and sustainable technologies has become a priority worldwide. The use of microbial-assisted phytoremediation approaches to degrade, remove and/or contain contaminants has gaining momentum in the last decades. Rhizoremediation appears as one of the most promising and cost-effective methods for the remediation of contaminated areas. This strategy is focused on the ability of root-associated microorganisms to degrade organic pollutants and transform toxic metals. Root exudates, including organic acids, amino acids, sugars, proteins, alcohols, nucleotides, flavanones, enzymes, and phenolic compounds, stimulate the survival and activity of rhizosphere microbial communities, resulting in a more efficient transformation/degradation of environmental pollutants.

Rhizoremediation contributes to remove from soil a plethora of contaminants such as metals/metalloids, pesticides, herbicides, petroleum products, fly ash, pharmaceuticals, among others.

In the case of metal(loid)s, microorganisms can reduce their toxicity by converting toxic metal(loid)s into non-toxic forms; by increasing their bioavailability enhancing the uptake by plants; or by in situ metal(loid)s stabilization. In addition, there are several tools that may improve the success and efficiency of rhizoremediation, including the biostimulation (e.g addition of organic/inorganic amendments and biosurfactants to induce microbial activity and change soil physicochemical properties), bioaugmentation (e.g. inoculation of microorganisms with specific catabolic ability and/or plant growth promoting traits) and rhizoengineering (e.g. use of genetically modified plants with higher ability to produce root exudates).

The submissions should cover the latest research related to metal(loid)s rhizoremediation. Special emphasis should be also given to new insights regarding the single and/or combined use of soil amendments, bioinoculants, and naturally/genetically adapted plants to enhance the success of rhizoremediation. Additionally, field studies demonstrating the transferability of greenhouse results are clearly insufficient, and therefore required to support the use of rhizoremediation by stakeholders.

Dr. Sofia Isabel Almeida Pereira
Prof. Dr. Ali Boularbah
Guest Editors

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  • metals
  • metalloids
  • microorganisms
  • soil remediation
  • soil health
  • inorganic pollutants
  • rhizodegradation
  • microbial communities
  • phytodegradation
  • plant growth promoting rhizobacteria
  • mycorrhizal fungi

Published Papers (1 paper)

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18 pages, 3876 KiB  
Interactive Effect of Arbuscular Mycorrhizal Fungi (AMF) and Olive Solid Waste on Wheat under Arsenite Toxicity
by Mha Albqmi, Samy Selim, Mohammad M. Al-Sanea, Taghreed S. Alnusaire, Mohammed S. Almuhayawi, Soad K. Al Jaouni, Shaimaa Hussein, Mona Warrad, Mahmoud R. Sofy and Hamada AbdElgawad
Plants 2023, 12(5), 1100; https://doi.org/10.3390/plants12051100 - 01 Mar 2023
Cited by 6 | Viewed by 1399
Heavy metal such as arsenite (AsIII) is a threat worldwide. Thus, to mitigate AsIII toxicity on plants, we investigated the interactive effect of olive solid waste (OSW) and arbuscular mycorrhizal fungi (AMF) on wheat plants under AsIII stress. To [...] Read more.
Heavy metal such as arsenite (AsIII) is a threat worldwide. Thus, to mitigate AsIII toxicity on plants, we investigated the interactive effect of olive solid waste (OSW) and arbuscular mycorrhizal fungi (AMF) on wheat plants under AsIII stress. To this end, wheat seeds were grown in soils treated with OSW (4% w/w), AMF-inoculation, and/or AsIII treated soil (100 mg/kg soil). AMF colonization is reduced by AsIII but to a lesser extent under AsIII + OSW. AMF and OSW interactive effects also improved soil fertility and increased wheat plants’ growth, particularly under AsIII stress. The interactions between OSW and AMF treatments reduced AsIII-induced H2O2 accumulation. Less H2O2 production consequently reduced AsIII-related oxidative damages i.e., lipid peroxidation (malondialdehyde, MDA) (58%), compared to As stress. This can be explained by the increase in wheat’s antioxidant defense system. OSW and AMF increased total antioxidant content, phenol, flavonoids, and α-tocopherol by approximately 34%, 63%, 118%, 232%, and 93%, respectively, compared to As stress. The combined effect also significantly induced anthocyanins accumulation. The combination of OSW+AMF improved antioxidants enzymes activity, where superoxide dismutase (SOD, catalase (CAT), peroxidase (POX), glutathione reductase (GR), and glutathione peroxidase (GPX) were increased by 98%, 121%, 105%, 129%, and 110.29%, respectively, compared to AsIII stress. This can be explained by induced anthocyanin percussors phenylalanine, cinamic acid and naringenin, and biosynthesic enzymes (phenylalanine aminolayse (PAL) and chalcone synthase (CHS)). Overall, this study suggested the effectiveness of OSW and AMF as a promising approach to mitigate AsIII toxicity on wheat growth, physiology, and biochemistry. Full article
(This article belongs to the Special Issue Rhizoremediation of Metal(loid)-Contaminated Soils)
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