Bioaccumulation of cadmium by Enterobacter sp. and enhancement of rice seedling growth under cadmium stress

Mitra, Soumik; Pramanik, Krishnendu; Sarkar, Arnab; Ghosh, Pallab; Soren, Tithi; Maiti, Tushar Kanti

doi:10.1016/j.ecoenv.2018.03.001

Cited by 140 publications

(45 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An elevation in the growth characteristics was also observed in Enterobacter inoculated O . sativa exposed to Cd 47 . Our studies were in the agreement with the previous studies conducted by Treesubsuntorn et al .…”

Section: Discussionmentioning

confidence: 99%

Metal resistant PGPR lowered Cd uptake and expression of metal transporter genes with improved growth and photosynthetic pigments in Lycopersicon esculentum under metal toxicity

Khanna

Jamwal

Gandhi

et al. 2019

Sci Rep

188

View full text Add to dashboard Cite

Plant growth promoting rhizobacteria (PGPRs) are very effective in immobilization of heavy metals and reducing their translocation in plants via precipitation, complex formation and adsorption. The present study was therefore designed to understand the role of Pseudomonas aeruginosa and Burkholderia gladioli in mitigation of Cd stress (0.4 mM) in 10-days old L . esculentum seedlings. The present work investigated growth characteristics, photosynthetic pigments, metal tolerance index, metal uptake and the contents of metal chelating compounds (protein bound and non-protein bound thiols, total thiols) in microbes inoculated Cd treated L . esculentum seedlings. The gene expression profiling of different metal transporters was conducted in order to investigate the quantitative analysis. Our results revealed Cd generated toxicity in seedlings in terms of reduced growth (root length, shoot length and fresh weight) and photosynthetic pigments (chlorophyll, carotenoid and xanthophyll) which enhanced upon inoculations of P . aeruginosa and B . gladioli . Further, the metal uptake along with levels of protein and non-protein bound thiols was also enhanced in Cd-treated seedlings. Gene expression studies suggested enhanced expression in the metal transporter genes which were further declined in the microbe supplemented seedlings. Therefore, micro-organisms possess growth promoting traits that enable them to reduce metal toxicity in plants.

show abstract

Section: Discussionmentioning

confidence: 99%

Metal resistant PGPR lowered Cd uptake and expression of metal transporter genes with improved growth and photosynthetic pigments in Lycopersicon esculentum under metal toxicity

Khanna

Jamwal

Gandhi

et al. 2019

Sci Rep

188

View full text Add to dashboard Cite

show abstract

“…Cd toxicity reduces plant growth, biomass, photosynthesis, yield, and quality [ 11 , 12 ]. Further, it impairs mineral nutrition in plants [ 13 , 14 ]. Several studies have shown that Cd toxicity alters nitrogen metabolism, reduces photosynthetic efficiency caused by impaired chlorophyll synthesis, and reduces carbon fixation [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Interactive effect of 24-epibrassinolide and silicon alleviates cadmium stress via the modulation of antioxidant defense and glyoxalase systems and macronutrient content in Pisum sativum L. seedlings

et al. 2018

View full text Add to dashboard Cite

BackgroundThis study assessed the effects of 24-epibrassinolide (EBL, 10–7M) and silicon (2 mM) on the alleviation of cadmium (Cd, 150 mg L–1) toxicity in Pisum sativum L. seedlings via the modulation of growth, antioxidant defense, glyoxalase system, and nutrient uptake.ResultsShoot and root lengths declined by 46.43% and 52.78%, respectively, following Cd stress. Shoot and root dry weights also declined with Cd toxicity. Biochemical and physiological aspects exhibit significant decline including total chlorophyll (33.09%), carotenoid (51.51%), photosynthetic efficiency (32.60%), photochemical quenching (19.04%), leaf relative water content (40.18%), and gas exchange parameters (80.65%). However, EBL or Si supplementation alone or in combination modulates the previously mentioned parameters. Cadmium stress increased proline and glycine betaine (GB) contents by 4.37 and 2.41-fold, respectively. Exposure of plants to Cd stress increased the accumulation of H2O2, malondialdehyde content, electrolyte leakage, and methylglyoxal, which declined significantly with EBL and Si supplementation, both individually and in combination. Similarly, Cd stress adversely affected enzymatic and non-enzymatic antioxidants, but EBL and/or Si supplementation maintained antioxidant levels. Glyoxalase I (GlyI) accumulated after Cd stress and increased further with the application of EBL and Si. However, GlyII content declined after Cd stress but increased with supplementation of EBL and Si. Cadmium accumulation occurred in the following order: roots > shoots>leaves. Supplementation with EBL and Si, individually and in combination reduced Cd accumulation and enhanced the uptake of macronutrients and micronutrients in shoots and roots, which declined with Cd toxicity.ConclusionThe application of 24-EBL and Si, individually and in combination, alleviated the adverse effects of Cd by improving growth, biochemical parameters, nutrient uptake, osmolyte accumulation, and the anti-oxidative defense and glyoxalase systems in Pisum sativum seedlings.

show abstract

“…Recently, a heavy metal resistant Enterobacter sp. has been isolated, which showed very high MIC and no distortion of cell surface morphology, even in the presence of 3 mg Cd mL −1 . Biostabilization of cadmium by Enterobacter cloacae was also demonstrated, which was also influenced by EPS .…”

Section: Discussionmentioning

confidence: 86%

“…Bacteria possessing these properties along with metal resistance might comprise some new factors in plant microbe interactions. Recently, some species of Enterobacter have been reported to alleviate abiotic stress, including cadmium‐induced oxidative stress in different plants …”

Section: Introductionmentioning

confidence: 99%

Root colonization by heavy metal resistant Enterobacter and its influence on metal induced oxidative stress on Cajanus cajan

2019

View full text Add to dashboard Cite

BACKGROUND: Heavy metal resistant bacterium Enterobacter sp. C1D was evaluated for cadmium (Cd) mediated exopolysaccharide production, biofilm formation and legume root colonization ability under Cd stress to alleviate metal induced stress. RESULTS:The plant was sensitive to Cd (IC 50 3-4 g mL −1 ), whereas the bacterium showed high Cd tolerance (MIC 99 120 g mL −1 ). Confocal laser scanning microscopy of the Cajanus cajan roots showed heavy loads of green fluorescence protein labelled Enterobacter sp. C1D on the surface of plant root, specifically at the point of root hair/lateral root formation along with cortex, even under metal stress. The root colonizing ability of Enterobacter sp. C1D was not affected by the presence of Rhizobium and the bacteria could be observed after 30 days of incubation in soil. Various plant growth parameters, antioxidant metabolites and oxidative stress indicator were significantly influenced by bacterial treatment, which, overall, reduced the adverse effect of Cd. CONCLUSION: Heavy metal tolerant bacteria may be a good choice for the development of biofertilizers and may work well with the native soil microbes such as Rhizobium under the metal polluted soil. Soil experimentsSterilized soil was amended with 0 or 50 or 100 mg kg −1 of Cd and/or inoculated and incubated in a greenhouse for 30 days. Root length, shoot length, fresh weight, number of pods, number of seeds, dry weight of pods, chlorophyll, H 2 O 2 and malondialdehyde (MDA) content, cellular glutathione, and non-protein thiol, protein and antioxidant enzyme from leaf extract were estimated.

show abstract

Bioaccumulation of cadmium by Enterobacter sp. and enhancement of rice seedling growth under cadmium stress

Cited by 140 publications

References 73 publications

Metal resistant PGPR lowered Cd uptake and expression of metal transporter genes with improved growth and photosynthetic pigments in Lycopersicon esculentum under metal toxicity

Metal resistant PGPR lowered Cd uptake and expression of metal transporter genes with improved growth and photosynthetic pigments in Lycopersicon esculentum under metal toxicity

Interactive effect of 24-epibrassinolide and silicon alleviates cadmium stress via the modulation of antioxidant defense and glyoxalase systems and macronutrient content in Pisum sativum L. seedlings

Root colonization by heavy metal resistant Enterobacter and its influence on metal induced oxidative stress on Cajanus cajan

Contact Info

Product

Resources

About