1
|
Arif MS, Yasmeen T, Shahzad SM, Riaz M, Rizwan M, Iqbal S, Asif M, Soliman MH, Ali S. Lead toxicity induced phytotoxic effects on mung bean can be relegated by lead tolerant Bacillus subtilis (PbRB3). CHEMOSPHERE 2019; 234:70-80. [PMID: 31203043 DOI: 10.1016/j.chemosphere.2019.06.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 05/30/2019] [Accepted: 06/03/2019] [Indexed: 05/20/2023]
Abstract
Being a primary toxic heavy metal, lead (Pb) contamination presents an imposing environmental and public health concern worldwide. A Bacillus subtilis PbRB3, displaying higher Pb tolerance, was isolated from the textile effluent. The bacterial culture was able to remove >80% of Pb from culture solution. Upon screening in the presence of Pb, PbRB3 strain exhibited significant plant growth promoting potential. A 3 weeks long pot experiment was established to examine the capability of PbRB3 strain for physiological and biochemical traits, and Pb accumulation tendency of mung bean at 250 and 500 mg kg-1 of Pb toxicity, respectively. With respect to control treatments, photosynthetic pigments, protein synthesis, net assimilation rate, transpiration rate and stomatal conductance were significantly constrained by Pb toxicity levels. Intrinsic and instantaneous water use efficiencies were considerably improved in inoculated plants under Pb toxicity. Compared to inoculated control, significantly higher superoxide dismutase activity in both Pb toxicity treatments, while higher malondialdehyde contents only at Pb500 treatment was recorded with PbRB3 inoculation. Catalase activity between Pb250 and Pb500 treatments was comparable at both inoculation level. Moreover, PbRB3 inoculation led to significantly higher peroxidase activity under Pb toxicity treatments compared to inoculated control. The PbRB3 inoculation led to comparable differences in root Pb content between Pb250 and Pb500 treatments. These results suggest that inoculation of Pb tolerant, Bacillus subtilis PbRB3, could be employed to improve mung bean growth potential and adaptation against Pb toxicity, and thereby accelerated Pb rhizoaccumulation from metal contaminated environment.
Collapse
Affiliation(s)
- Muhammad Saleem Arif
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan
| | - Tahira Yasmeen
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan.
| | - Sher Muhammad Shahzad
- Department of Soil & Environmental Sciences, University College of Agriculture, University of Sargodha, Pakistan
| | - Muhammad Riaz
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan
| | - Muhammad Rizwan
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan
| | - Shahid Iqbal
- Key Laboratory for Economic Plants and Biotechnology, Centre for Mountain Futures CMF, East and Central Asia Regional Office, World Agroforestry Centre ICRAF, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, CN, 650201, China
| | - Muntaha Asif
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan
| | - Mona H Soliman
- Biology Department, Faculty of Science, Taibah University, Al-Sharm, Yanbu El-Bahr, 46429, Saudi Arabia; Department of Botany and Microbiology, Faculty of Science, Cairo University, 12613, Giza, Egypt
| | - Shafaqat Ali
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000, Pakistan
| |
Collapse
|
2
|
Wani W, Masoodi KZ, Zaid A, Wani SH, Shah F, Meena VS, Wani SA, Mosa KA. Engineering plants for heavy metal stress tolerance. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2018. [DOI: 10.1007/s12210-018-0702-y] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
3
|
da Silva WR, da Silva FBV, Araújo PRM, do Nascimento CWA. Assessing human health risks and strategies for phytoremediation in soils contaminated with As, Cd, Pb, and Zn by slag disposal. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 144:522-530. [PMID: 28675866 DOI: 10.1016/j.ecoenv.2017.06.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 06/26/2017] [Accepted: 06/28/2017] [Indexed: 06/07/2023]
Abstract
Soils impacted by metallurgy activities pose serious risks to the health of exposed populations, whether by ingestion of soil or contaminated food and water. The municipality of Santo Amaro, Bahia state, presents the most important case of human lead contamination in Brazil. It occurred because of inadequate slag disposal. The aims of this research were to: (i) determine the environmentally available concentrations and the distribution of As, Cd, Pb, and Zn in soil fractions; (ii) estimate the non-carcinogenic and carcinogenic risks of these elements for children; and (iii) to evaluate the use of corn (Zea mays) and castor bean (Ricinus communis) either for phytoextraction induced by chelating agents or phytostabilization. Our data demonstrated that the environmentally available concentrations of As, Cd, Pb, and Zn in soils surrounding the Pb smelting plant are among the highest that have been reported. Apart from Cd, sequential extraction demonstrated that most metals are in recalcitrant forms in the soil. However, the daily exposure of children to Pb, Zn, Cd, and As exceeded the acceptable daily intake as established by the World Health Organization. Non-carcinogenic risk modeling indicated probable adverse health effects from chronic exposure to soil Pb. The mean estimated time for remediation of the area using phytoextraction was high, ranging from 76 to 259 years; therefore, this is not a viable alternative for remediating soils in the studied area. However, good development in the contaminated soil along with restriction of the metal(oid) translocation to shoots enables castor bean to phytostabilize metal(oid)s. Additionally, castor bean cultivation may be an alternative for an economic return because of biofuel production.
Collapse
Affiliation(s)
- William Ramos da Silva
- Departament of Agronomy, Federal Rural University of Pernambuco, Dom Manuel de Medeiros street, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
| | - Fernando Bruno Vieira da Silva
- Departament of Agronomy, Federal Rural University of Pernambuco, Dom Manuel de Medeiros street, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
| | - Paula Renata Muniz Araújo
- Departament of Agronomy, Federal Rural University of Pernambuco, Dom Manuel de Medeiros street, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
| | | |
Collapse
|
4
|
Yin Z, Cao J, Li Z, Qiu D. Reducing the bioavailability of cadmium in contaminated soil by dithiocarbamate chitosan as a new remediation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:9668-9675. [PMID: 25628112 DOI: 10.1007/s11356-015-4094-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2014] [Accepted: 01/08/2015] [Indexed: 06/04/2023]
Abstract
Dithiocarbamate chitosan (DTC-CTS) was used as a new amendment for remediation of cadmium (Cd)-contaminated soils to reduce the Cd bioavailability. Arabidopsis thaliana was chosen as a model plant to evaluate its efficiency. It was found that DTC-CTS could effectively improve the growth of A. thaliana. The amount of Cd up-taken by A. thaliana could be decreased by as much as 50% compared with that grown in untreated Cd-contaminated soil samples. The chlorophyll content and the aerial biomass of Arabidopsis also increased substantially and eventually returned to a level comparable to plants grown in non-contaminated soils, with the addition of DTC-CTS. These findings suggested that DTC-CTS amendment could be effective in immobilizing Cd and mitigating its accumulation in plants grown in Cd-contaminated soils, with potential application as an in situ remediation of Cd-polluted soils.
Collapse
Affiliation(s)
- Zheng Yin
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | | | | | | |
Collapse
|
5
|
Photosynthetic responses of Oryza sativa L. seedlings to cadmium stress: physiological, biochemical and ultrastructural analyses. Biometals 2014; 27:389-401. [DOI: 10.1007/s10534-014-9720-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 02/12/2014] [Indexed: 10/25/2022]
|