Inoculation of Fe/Mn-oxidizing bacteria enhances Fe/Mn plaque formation and reduces Cd and As accumulation in Rice Plant tissues

Dong, Ming Fang; Feng, Renwei; Wang, Rui Gang; Sun, Yang; Ding, Yong Zhen; Xu, Ying; Fan, Zhi Lian; Guo, Jun

doi:10.1007/s11104-016-2829-x

Cited by 76 publications

(12 citation statements)

References 43 publications

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“…Polluted river irrigation, straw turnover, and Cd-bearing fertilizer application resulted in the increased contents of total Cd, total P, and organic elements in plow layer soil. Water-retaining properties and Cd bound to plant residues and oxide minerals restricted the downward migration of Cd to plow pan soils ( Matos et al, 2001 ; Dong et al, 2016 ), which was in accordance with the findings of significantly higher total Cd contents in plow layer soils and their positive correlation with organic elements ( p <0.01; Table 1B ). Pearson correlation analysis indicated that soil factors, especially soil pH and organic elements, significantly affected the Cd speciation distribution between the two soil layers ( Figure 1B ; Wang et al, 2020 ).…”

Section: Discussionsupporting

confidence: 88%

Cadmium Speciation Distribution Responses to Soil Properties and Soil Microbes of Plow Layer and Plow Pan Soils in Cadmium-Contaminated Paddy Fields

et al. 2021

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Cadmium (Cd) speciation ratio in arable land determines the Cd exposure risk and Cd uptake in crops. However, the driving mechanisms of Cd speciation change on the vertical scale of paddy fields remain poorly understood. In this study, the effects of plow layer and plow pan on Cd speciation distribution were investigated in a long-term Cd-contaminated rice ecosystem. The Cd accumulative effect within rice grain was enhanced with high levels of activated Cd speciation ratios in soils. Activated Cd speciation ratios were higher in plow layer soils, while stabilized Cd speciation ratios were elevated in plow pan soils. Soil physicochemical properties and soil microbes synergistically affected the Cd speciation changes in different ways between the two soil layers. Soil pH and organic elements in plow layer environment directly hindered the transformation of stabilized Cd speciation, while in plow pan environment, soil pH and organic elements indirectly decreased activated Cd speciation ratios and resulted in the accumulation of stabilized Cd speciation via regulating the predominant bacterial taxa. This study will improve our understanding of how soil environments regulate Cd speciation distributions in rice ecosystems and help to seek effective remediation methods of Cd-contaminated paddy fields to reduce the Cd accumulation in rice.

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Section: Discussionsupporting

confidence: 88%

Cadmium Speciation Distribution Responses to Soil Properties and Soil Microbes of Plow Layer and Plow Pan Soils in Cadmium-Contaminated Paddy Fields

et al. 2021

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“…The formation of Fe/Mn plaques on these roots was influenced by Fe/Mn‐oxidizing bacteria, with the uptake of toxic metals being lower than their deposition on root surfaces (Dong et al . ). In microorganisms, Mn oxides may protect against external reactive oxygen species or may reduce the toxicity of Mn(II) and/or other toxic metals (Banh et al .…”

Section: Discussionmentioning

confidence: 97%

Mn accumulation in a submerged plant Egeria densa (Hydrocharitaceae) is mediated by epiphytic bacteria

Tsuji

Asayama

Shiraki

et al. 2017

Plant Cell & Environment

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Many aquatic plants act as biosorbents, removing and recovering metals from the environment. To assess the biosorbent activity of Egeria densa, a submerged freshwater macrophyte, plants were collected monthly from a circular drainage area in Lake Biwa basin and the Mn concentrations of the plants were analysed. Mn concentrations in these plants were generally above those of terrestrial hyperaccumulators, and were markedly higher in spring and summer than in autumn. Mn concentrations were much lower in plants incubated in hydroponic medium at various pH levels with and without Mn supplementation than in field-collected plants. The precipitation of Mn oxides on the leaves was determined by variable pressure scanning electron microscopy-energy dispersive X-ray analysis and Leucoberbelin blue staining. Several strains of epiphytic bacteria were isolated from the field-collected E. densa plants, with many of these strains, including those of the genera Acidovorax, Comamonas, Pseudomonas and Rhizobium, found to have Mn-oxidizing activity. High Mn concentrations in E. densa were mediated by the production of biogenic Mn oxide in biofilms on leaf surfaces. These findings provide new insights into plant epidermal bacterial flora that affect metal accumulation in plants and suggest that these aquatic plants may have use in Mn phytomining.

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“…in which inoculation of Burkholderia sp. decreased Cd translocation in rice and elevating the photosynthetic efficiencies in plants 30 . A better interpretation of characteristics of metal-resistant and metal-immobilizer plant growth promoting bacteria is a crucial prerequisite for establishment of effective and eco-friendly strategies for crop production in metal polluted environment.…”

Section: Introductionmentioning

confidence: 97%

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

200

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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.

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Inoculation of Fe/Mn-oxidizing bacteria enhances Fe/Mn plaque formation and reduces Cd and As accumulation in Rice Plant tissues

Cited by 76 publications

References 43 publications

Cadmium Speciation Distribution Responses to Soil Properties and Soil Microbes of Plow Layer and Plow Pan Soils in Cadmium-Contaminated Paddy Fields

Cadmium Speciation Distribution Responses to Soil Properties and Soil Microbes of Plow Layer and Plow Pan Soils in Cadmium-Contaminated Paddy Fields

Mn accumulation in a submerged plant Egeria densa (Hydrocharitaceae) is mediated by epiphytic bacteria

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

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