Phytoremediation of heavy metals by Alternanthera bettzickiana: Growth and physiological response

Tauqeer, Hafiz Muhammad; Ali, Shafaqat; Rizwan, Muhammad; Ali, Shafaqat; Saeed, Rashid; Iftikhar, Usman; Ahmad, Roslina; Farid, Mujahid; Abbasi, Ghulam Hassan

doi:10.1016/j.ecoenv.2015.12.031

Cited by 243 publications

(73 citation statements)

References 29 publications

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“…This was first suggested by the fact that seeds still germinated in the presence of high concentrations of HMs, but the subsequent seedling growth (after the breakage of seed coat) was severely inhibited at much lower concentrations of HMs (Li et al, 2005). In accordance to our results Tauqeer et al (2016) showed that plant growth characteristics and biomass gradually increased under lower metal stress (0.5 and 1.0 mM Cd or Pb) as compared to control while decreased under higher metal stress (2.0 mM).…”

Section: Discussionsupporting

confidence: 81%

Effects of sewage sludge on bio-accumulation of heavy metals in tomato seedlings

Elloumi

Belhaj

Jerbi

et al. 2017

Span. j. agric. res.

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The proposal to use sewage sludge (SS) on agricultural fields as a sustainable way to dispose of the waste is based on its high organic and nutrients content. However, the presence of heavy metals (HMs) in sludge can contaminate crops and accumulate in the food chain. The aim of this study was to assess changes in soil fertility, biochemical responses of tomato (Solanum lycopersicum L. cv. Rio Grande) seedlings and the availability of HMs with increased rate application of SS (0, 2.5, 5 and 7.5%). Leaf chlorophyll content, nutritional status, proline, membrane peroxidation, stomatal conductance and HM accumulation were investigated. Results showed that the soil pH decreased, whereas soil salinity, organic carbon, total N, available P and exchangeable Na, Ca, K and HM content increased significantly with increasing application rates of SS. Among the three HMs (Zn, Cu and Cr), Zn had the highest capacity for transferring from soil into plants. Low metal translocation was observed from roots to leaves. The 7.5% SS dose decreased biomass production and caused a decline in chlorophyll content and stomatal conductance. However, lipid peroxidation and proline contents increased. Therefore, the use of 2.5 and 5% doses of sewage sludge in agriculture would be an efficient and costeffective method to restore the fertility of soil and an environment-friendly solution for disposal problems.Additional key words: sewage sludge amendment; soil fertility; biochemical responses; Solanum lycopersicum.

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Section: Discussionsupporting

confidence: 81%

Effects of sewage sludge on bio-accumulation of heavy metals in tomato seedlings

Elloumi

Belhaj

Jerbi

et al. 2017

Span. j. agric. res.

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“…Five millilitres of acetone was added to 0.5 g of leaf tissue, which was incubated in darkness (4˚C for 72 h) until the colour completely disappeared from the leaves [33,34,35,36]. The samples were then centrifuged at 4000 g for 10 min at 4˚C, after which the supernatant was collected.…”

Section: Physiological Measurements 231 Photosynthetic Pigmentsmentioning

confidence: 99%

Response of photosynthesis to different concentrations of heavy metals in Davidia involucrata

et al. 2020

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Lead (Pb) and cadmium (Cd) are highly toxic and are widespread in agricultural soils, representing risks to plant and human health. In this study, Davidia involucrata was cultivated in soil with different concentrations of Pb and Cd and sampled after 90 days. We used ANOVA to analyse the photosynthesis of D. involucrata and the ability of Pb and Cd to enrich and migrate in roots, stems and leaves. Various results are described here. 1) Under individual and combined Pb and Cd stress, the accumulation factors in the roots were greater than 1, which was significantly greater than those in the stems and leaves (P < 0.05), and the translocation factors both were less than 1. The Pb and Cd enrichment ability of D. involucrata roots was significantly higher than that of stems and leaves, and the migration ability of the two heavy metals in D. involucrata was weak. 2) The Mg-dechelatase activities of chlorophyll degradation products increased under stress due to high concentrations of Pb and Cd. However, chlorophyllase activity was higher at relatively low concentrations of the two heavy metals (P < 0.05). δ-Aminolevulinic acid and porphobilinogen of chlorophyll synthesis products are easily converted to uroporphyrinogen III under low concentrations of Cd, which promotes the synthesis of chlorophyll.3) The effect of Cd stress alone on the chlorophyll concentration was not significant. Under combined stress, concentrations of Pb and Cd in the range of 400~800 mg�kg -1 and 5~20 mg�kg -1 significantly promoted an increase in photosynthetic pigments (P < 0.05). 4) Inhibition of the net photosynthetic rate increased with increasing Pb and Cd concentrations under both individual and combined stress. In addition, the root of D. involucrata had a strong absorption and fixation effect on heavy metals, thereby reducing metal toxicity and improving the tolerance of D. involucrata to heavy metals. , et al. (2020) Response of photosynthesis to different concentrations of heavy metals in Davidia involucrata. PLoS ONE 15(3): e0228563.

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“…The symptoms are usually characterized by growth inhibition, leaf chlorosis, metabolic block, and even plant death (Abd Allah et al, 2015; Hashem et al, 2016). Moreover, the absorbed Cd can poison other organisms, including humans, along the food chain (Amna et al, 2015; Tauqeer et al, 2016). After entering human body, Cd is selectively enriched in the kidney and liver, damaging organ functions (Wu, 2015).…”

Section: Introductionmentioning

confidence: 99%

Cadmium Accumulation Characteristics in Turnip Landraces from China and Assessment of Their Phytoremediation Potential for Contaminated Soils

Zhang

Yang

et al. 2016

Front. Plant Sci.

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Heavy metal (HM) pollution is a global environmental problem that threatens ecosystem and human health. Cadmium (Cd) pollution is the most prominent HM pollution type because of its high toxicity, strong migration, and the large polluted area globally. Phytoremediation of contaminated soil is frequently practiced because of its cost-effectiveness and operability and because it has no associated secondary pollution. High-accumulation plants, including those identified as hyperaccumulators, play an important role in phytoremediation. Therefore, screening of plants to identify hyperaccumulators is important for continued phytoremediation. In the present study, we investigated the Cd tolerance and accumulation capabilities of 18 turnip landraces from China under a soil experiment with known Cd level. The results indicated that turnip has a high capacity for Cd accumulation. Furthermore, significant differences in Cd tolerance and accumulation characteristics were found among different landraces when they grew at 50 mg kg-1 (dry weight) Cd concentration. Among the studied landraces, five turnip landraces met the requirements of Cd hyperaccumulators and three landraces were identified as potential candidates. However, the total Cd content accumulated by individual plant of different turnip landraces was dependent on both the Cd accumulation capacity and plant biomass. Compared with some reported Cd hyperaccumulators, turnip not only shows a high Cd-accumulation capacity but also has rapid growth and a wide distribution area. These advantages indicate that turnip may have considerable potential for phytoremediation of Cd-contaminated soil. Furthermore, the study also indicates that it is not advisable to consume turnip cultivated in an environment that exceeds safe Cd levels.

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Phytoremediation of heavy metals by Alternanthera bettzickiana: Growth and physiological response

Cited by 243 publications

References 29 publications

Effects of sewage sludge on bio-accumulation of heavy metals in tomato seedlings

Effects of sewage sludge on bio-accumulation of heavy metals in tomato seedlings

Response of photosynthesis to different concentrations of heavy metals in Davidia involucrata

Cadmium Accumulation Characteristics in Turnip Landraces from China and Assessment of Their Phytoremediation Potential for Contaminated Soils

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