Impact of Heavy Metals on Physiological Processes of Plants: With Special Reference to Photosynthetic System

Rai, Richa; Agrawal, Madhoolika; Agrawal, Shashi Bhushan

doi:10.1007/978-981-10-2860-1_6

Cited by 67 publications

(46 citation statements)

References 43 publications

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“…Chlorophyll and carotenoids, which are photosynthetic pigments, are important substances in plants for the conversion of solar energy into chemical energy. These pigments guarantee that plants are able to synthesize their own substances [39]. With an increase in the concentration of single Pb and combined stress, Chl-a, Chl-b and total chlorophyll showed increasing trends, and the concentrations were higher than those of the control group.…”

Section: Response Of Photosynthetic Pigments To Pb and CDmentioning

confidence: 94%

“…Wu et al [10] reported that the accumulation capacity of rape under Cd stress was greater than that under Pb stress for both individual and combined stress and that the toxic effect of Cd was greater than that of Pb. In addition, Rai et al [39] reported that magnesium (Mg) within the chlorophyll ring is easily replaced by Cd. These results are consistent with those of our study.…”

Section: Accumulation and Translocation Of Pb And CD In D Involucratamentioning

confidence: 99%

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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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Section: Response Of Photosynthetic Pigments To Pb and CDmentioning

confidence: 94%

Section: Accumulation and Translocation Of Pb And CD In D Involucratamentioning

confidence: 99%

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

et al. 2020

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“…The correlation analysis showed strong relativity among the As, Cu, and Zn, with similar spatial distribution trends. Previous studies revealed that the trace metal was a threat to human life in agricultural areas due to the abuse of agricultural pesticides and chemical fertilizers (Kalaivanan and Ganeshamurthy 2016;Rai et al 2016). The main human origin of Cu in agricultural soils was the application of Cu-based agrochemicals and phosphate fertilizers (Micó et al 2006).…”

Section: Sources Identificationmentioning

confidence: 99%

Distribution and risk assessment of trace metals in riverine surface sediments in gold mining area

Song

Liu

Sheng

2019

Environ Monit Assess

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Recognizing the pollution characteristics and potential risks of trace metals in sediments are important to protect water ecosystem safety. In the present study, a systematic investigation was performed to assess the pollution and risk level of trace metals in river sediments located in the greatest gold production base in China. The geo-accumulation index was used to assess the contamination degree. The sediment quality guidelines and potential ecological risk index were employed to complete an ecological risk assessment. A noncarcinogenic health risk assessment was also carried out to evaluate potential adverse health risks. Correlations and principal component analyses were applied to check relationships among trace metals and ascertain potential pollution sources. The results suggested that the sediments in the river were most polluted by As, Cd, and Hg followed by Cu, Pb, and Zn. The assessment of potential human health risk revealed that there was no significant non-carcinogenic risk to the inhabitants. Gold mining and smelting activities and the long-term excessive application of fertilizers and agrochemicals were identified as the main anthropogenic releases. This study contributed an understanding that possible sources, contamination degree, and ecological risk level of trace metals in riverine surface sediments in a gold mining area.

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“…Investigations have demonstrated that mercury is readily accumulated by higher plants and causes severe damage to the cellular metabolism and physiology of the plants (Cargnelutti et al, ). Mercury hinders the photosynthetic electron transport and is exceedingly harmful as a result of the capacity of Hg 2+ to bind with proteins (Rai, Agrawal, & Agrawal, ). Once, in the cell, Hg 2+ forms covalent bonds with cysteine residues of proteins, it drains antioxidants.…”

Section: Introductionmentioning

confidence: 99%

A putative merR family transcription factor Slr0701 regulates mercury inducible expression of MerA in the cyanobacterium Synechocystis sp. PCC6803

et al. 2019

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In cyanobacteria, genes conferring mercury resistance are not organized as mer‐operon, unlike in other bacterial phyla. Synechocystis contains only a putative MerR regulator, Slr0701, and a mercury reductase, MerA, located aside from each other in the genome. The slr0701‐mutant showed reduction in photosynthetic activity and reduced tolerance to mercury compared to the wild‐type. The incubation of wild‐type cells with HgCl2 resulted in the upregulation of slr0701 and slr1849 genes whereas mercury‐induced expression was not observed in the slr0701‐mutant. Slr0701 binds to a conserved cis‐regulatory element located in the upstream of slr1849 and slr0701 ORFs. The same element was also identified in the upstream of other cyanobacterial homologs. Slr0701 binds to cis‐regulatory element with faster association and slower dissociation rates in the presence of HgCl2. Although these genes were constitutively expressed, the addition of HgCl2 enhanced their promoter activity suggesting that mercury‐bound Slr0701 triggers induced expression of these genes. The enhanced promoter activity could be attributed to the observed secondary structural changes in Slr0701 in the presence of HgCl2. For the first time, we demonstrated the mechanism of merA regulation in a cyanobacterium, Synechocystis. Although merA and merR genes are distantly located on the cyanobacterial genome and distinct from other bacterial mer‐operons, the transcriptional regulatory mechanism is conserved.

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Impact of Heavy Metals on Physiological Processes of Plants: With Special Reference to Photosynthetic System

Cited by 67 publications

References 43 publications

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

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

Distribution and risk assessment of trace metals in riverine surface sediments in gold mining area

A putative merR family transcription factor Slr0701 regulates mercury inducible expression of MerA in the cyanobacterium Synechocystis sp. PCC6803

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