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Author: search.filters.author.Sidhu, G.P.S.Subject: search.filters.subject.Contaminated soils

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    Bioaccumulation and physiological responses to lead (Pb) in Chenopodium murale L
    (Academic Press, 2018) Sidhu, G.P.S.; Bali A.S.; Bhardwaj R.; Singh H.P.; Batish D.R.; Kohli R.K.
    Identification and screening of wild, wasteland plants for the remediation of heavy metal contaminated soils is a crucial phytotechnological approach. In a pot experiment, Chenopodium murale was tested for the phytoextraction of lead (Pb) from the contaminated soils. The experiment was conducted for 8 weeks to appraise the effect of varied Pb regimes (300, 400, 500 mg kg?1) on the bioaccumulation and physiological responses of C. murale plants. At 500 mg kg?1 Pb regime, the concentration of Pb in roots and shoots reached a maximum of 2513 and 2301 mg kg?1 DW, respectively. The plants highlighted a very high tolerance with 100% survival towards Pb toxicity, although exhibited a slight decrease in biomass yield, chlorophyll content and protein levels. However, a dramatic mount in H2O2 content, MDA level and bio-activities of antioxidant enzymes (SOD, CAT and POD) was noticed. BCF and TF values were more than unity at all the Pb regimes. Results were scrutinized, accentuating the profit of raising C. murale in Pb-contaminated soils as this plant species can be a promising candidate for soil remediation and their restoration purposes.
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    Ethylenediamine disuccinic acid enhanced phytoextraction of nickel from contaminated soils using Coronopus didymus (L.) Sm.
    (Elsevier Ltd, 2018) Sidhu, G.P.S.; Bali, A.S.; Singh, H.P.; Batish, Daizy R.; Kohli, R.K.
    In a screenhouse, the applicability of biodegradable chelant ethylenediamine disuccinic acid (EDDS) to enhance Ni-phytoextraction by Coronopus didymus was tested for the first time. This study assayed the hypothesis based upon the role of EDDS on physiological and biochemical alterations and ameliorating phytoextraction capacity of C. didymus under nickel (Ni) stress. Pot experiments were conducted for 6 weeks and C. didymus plants were cultivated in soil artificially contaminated with 30, 50, and 70 mg kg?1 Ni treatments. Soil was amended with EDDS (2 mmol kg?1). Plants were harvested, 1 week after EDDS application. At 70 mg kg?1 Ni level, EDDS application dramatically enhanced the root and shoot Ni concentration from 665 and 644 to 1339 and 1338 mg kg?1, respectively. Combination of Ni + EDDS induced alterations in biochemical parameters of plants. EDDS addition posed pessimistic effects on growth, biomass, photosynthetic activity and protein content of the plants. Besides, application of EDDS stimulated the generation of superoxide anion, H2O2 content and MDA level. However, EDDS assisted mount in antioxidant activities (superoxide dismutase, catalase and glutathione peroxidase) considerably neutralised the toxicity induced by reactive oxygen species in plant tissues. The results revealed EDDS efficacy to ameliorate the performance of antioxidant enzymes and improved Ni translocation in plant tissues, thus strongly marked its affinity to be used together with C. didymus for Ni-phytoextraction. ? 2018 Elsevier Ltd