Metal-induced oxidative stress impacting plant growth in contaminated soil is alleviated by microbial siderophores

Dimkpa, Christian O.; Merten, D.; Svatoš, Aleš; Büchel, Georg; Kothe, Erika

doi:10.1016/j.soilbio.2008.10.010

Cited by 245 publications

(129 citation statements)

References 50 publications

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“…The role of Fe in crop disease suppression appears to be mainly indirect, through the interactions of root-associated beneficial microbes (so-called biocontrol agents) with disease-causing soil microbes. Here, siderophores, metal chelators produced by beneficial microbes in response to Fe scarcity, play a role in depriving pathogens of Fe, as well as in availing plants with Fe and other metallic micronutrients (Kloepper et al 1980;Lim and Kim 1997;Vansuyt et al 2007;Dimkpa et al 2009Dimkpa et al , 2015a. This role is the basis for the use of siderophoreproducing bacteria, or siderophores extracted from bacteria, as biofertilizers to supply Fe to plants (Fernandez et al 2005;Radzki et al 2013).…”

Section: Physiological Roles and Roles In Abiotic And Biotic Stress Mmentioning

confidence: 99%

Fortification of micronutrients for efficient agronomic production: a review

Dimkpa

Bindraban

2016

Agron. Sustain. Dev.

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264

163

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Micronutrients are essential mineral elements required for both plant and human development. However, micronutrients are often lacking in soils, crop, and food. Micronutrients are therefore used as fertilizer to increase crop productivity, especially when the application of conventional NPK fertilizers is not efficient. Here, we review the application of micronutrients in crop production. Reports show that micronutrients enhance crop nutritional quality, crop yield, biomass production, and resiliency to drought, pest, and diseases. These positive effects range from 10 to 70 %, dependent on the micronutrient, and occur with or without NPK fertilization. We discuss the uptake by plants of micronutrients as nanosize particulate materials, relative to conventional uptake of ionic nutrients. We also show that packaging of micronutrients as nanoparticles could have more profound effects on crop responses and fertilizer use efficiency, compared to conventional salts or bulk oxides.

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Section: Physiological Roles and Roles In Abiotic And Biotic Stress Mmentioning

confidence: 99%

Fortification of micronutrients for efficient agronomic production: a review

Dimkpa

Bindraban

2016

Agron. Sustain. Dev.

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264

163

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“…[1][2][3] Being unable to move away from their places of germination, in order to avoid excess metal-induced damages, plants have to evolve different strategies and complex regulatory mechanisms to survive harsh conditions, such as regulation of metal irons uptake, chelation and efflux, perception transduction and transmission of stress stimuli. [4][5][6][7][8][9] Recent research has revealed that metal-mediated stress seems to have a direct impact on accumulation of relative oxygen species (ROS), content of nitric oxide (NO) and hormone levels in organs and the plants can quickly adjust their growth to harsh environment by influencing the cellular redox state and hormone signaling.…”

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confidence: 99%

Role of ROS and auxin in plant response to metal-mediated stress

Yuan

Liu

Jin

et al. 2013

Plant Signaling & Behavior

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“…One biofertilizer, the phytohormone indole-3-acetic acid (IAA), is important in microbe-microbe and microbe-plant signaling and promotes growth in a variety of plant species (1,3,4,9,14,16,17,19,24,26,32,36,40). However, the plant growth effects of bacterial IAA are concentration dependent: improved cucumber growth in sterile soil correlates with IAA production from Pseudomonas fluorescens CHA0 at Ͻ0.7 g/ml, whereas an overproducing mutant generating IAA at ϳ153 g/ml stunts cucumber growth (4).…”

mentioning

confidence: 99%

Production of Indole-3-Acetic Acid via the Indole-3-Acetamide Pathway in the Plant-Beneficial Bacterium Pseudomonas chlororaphis O6 Is Inhibited by ZnO Nanoparticles but Enhanced by CuO Nanoparticles

Dimkpa

Zeng

McLean

et al. 2012

Appl Environ Microbiol

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106

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The beneficial bacterium Pseudomonas chlororaphis O6 produces indole-3-acetic acid (IAA), a plant growth regulator. However, the pathway involved in IAA production in this bacterium has not been reported. In this paper we describe the involvement of the indole-3-acetamide (IAM) pathway in IAA production in P. chlororaphis O6 and the effects of CuO and ZnO nanoparticles (NPs). Sublethal levels of CuO and ZnO NPs differentially affected the levels of IAA secreted in medium containing tryptophan as the precursor. After 15 h of growth, CuO NP-exposed cells had metabolized more tryptophan than the control and ZnO NPchallenged cells. The CuO NP-treated cells produced higher IAA levels than control cultures lacking NPs. In contrast, ZnO NPs inhibited IAA production. Mixing of CuO and ZnO NPs resulted in an intermediate level of IAA production relative to the levels in the separate CuO and ZnO NP treatments. The effect of CuO NPs on IAA levels could be duplicated by ions at the concentrations released from the NPs. However, ion release did not account for the inhibition caused by the ZnO NPs. The mechanism underlying changes in IAA levels cannot be accounted for by effects on transcript accumulation from genes encoding a tryptophan permease or the IAM hydrolase in 15-h cultures. These findings raise the issue of whether sublethal doses of NPs would modify the beneficial effects of association between plants and bacteria.

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Metal-induced oxidative stress impacting plant growth in contaminated soil is alleviated by microbial siderophores

Cited by 245 publications

References 50 publications

Fortification of micronutrients for efficient agronomic production: a review

Fortification of micronutrients for efficient agronomic production: a review

Role of ROS and auxin in plant response to metal-mediated stress

Production of Indole-3-Acetic Acid via the Indole-3-Acetamide Pathway in the Plant-Beneficial Bacterium Pseudomonas chlororaphis O6 Is Inhibited by ZnO Nanoparticles but Enhanced by CuO Nanoparticles

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