Siderophore Utilization by
            <i>Bradyrhizobium japonicum</i>

Plessner, Ora; Klapatch, Taryn; Guerinot, Mary Lou

doi:10.1128/aem.59.5.1688-1690.1993

Cited by 73 publications

(17 citation statements)

References 21 publications

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“…This fact might explain why the strains sensitive to As (Figure 1) also showed a pattern of multiple resistance to β-lactams antibiotics ( Figure 2), since most of them are Gram-negative. Most of the As-sensitive bacteria (Figure 1; Table 2) belonged to the genus Bradyrhizobium, which is known for producing and using outer membrane proteins as an uptake system for siderophore-metal complexes (50). Overall, these observations might suggest that the β-lactams antibiotics resistance and As resistance are related only by the permeability of the membrane for trace elements and antibiotics.…”

Section: Table 4 4 Discussionmentioning

confidence: 97%

Leguminosae native nodulating bacteria from a gold mine As-contaminated soil: Multi-resistance to trace elements, and possible role in plant growth and mineral nutrition

Rangel

Oliveira-Longatti

Ferreira

et al. 2017

International Journal of Phytoremediation

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Efficient N-fixing Leguminosae nodulating bacteria resistant to As may facilitate plant growth on As-contaminated sites. In order to identify bacteria holding these features, 24 strains were isolated from nodules of the trap species Crotalaria spectabilis (12) and Stizolobium aterrimum (12) growing on an As-contaminated gold mine site. 16S rRNA gene sequencing revealed that most of the strains belonged to the group of α-Proteobacteria, being representatives of the genera Bradyrhizobium, Rhizobium, Inquilinus, Labrys, Bosea, Starkeya, and Methylobacterium. Strains of the first four genera showed symbiotic efficiency with their original host, and demonstrated in vitro specific plant-growth-promoting (PGP) traits (production of organic acids, indole-3-acetic-acid and siderophores, 1-aminocyclopropane-1-carboxylate deaminase activity, and Ca(PO) solubilization), and increased resistance to As, Zn, and Cd. In addition, these strains and some type and reference rhizobia strains exhibited a wide resistance spectrum to β-lactam antibiotics. Both intrinsic PGP abilities and multi-element resistance of rhizobia are promising for exploiting the symbiosis with different legume plants on trace-element-contaminated soils.

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Section: Table 4 4 Discussionmentioning

confidence: 97%

Leguminosae native nodulating bacteria from a gold mine As-contaminated soil: Multi-resistance to trace elements, and possible role in plant growth and mineral nutrition

Rangel

Oliveira-Longatti

Ferreira

et al. 2017

International Journal of Phytoremediation

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“…The significant correlations observed between soybean P and soil EEP i fraction may also be attributed to the seeming similarities between the mechanisms by which these grain legumes obtain P from the rhizosphere and the mechanistic basis of the enzymatic bioactive P assay. These crop plants synthesize and release organic compounds into the rhizosphere that are either potent ligands themselves, or induce rhizosphere microorganisms to produce plant‐growth promoting effects (Plessner et al, 1993; Rosas et al, 2006). These latter effects are manifested through the enhanced solubilization of iron, phosphate, and other nutrients (Cattelan et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Relationships between Immobilized Phosphorus Uptake in Two Grain Legumes and Soil Bioactive Phosphorus Pools in Fertilized and Manure‐Amended Soil

Rao

Dao

2008

Agronomy Journal

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A gronomy J our n al • Volume 10 0 , I s sue 6 • 2 0 0 8 1535 ABSTRACT Mixing P-immobilizing additives with manure has raised concerns of irreversible reduction in P availability to growing crops. A potted plant growth experiment was conducted to characterize cattle manure P mineralization as modifi ed by iron amendments and uptake by pigeon pea (Cajanus cajan L. Millsp.) and soybean [Glycine max (L.) Merr.]. Triple superphosphate, untreated, or manure amended with Fe at 1:1 or 1:3 molar ratio of manure P:Fe, was applied to Dale silt loam (fi ne-silty, mixed, superactive, thermic Pachic Haplustolls) at the rate of 20 mg kg −1 . Whole plants were harvested at three stages of development (vegetative, fl owering, and physiological maturity) to determine and correlate P uptake to changes in soil bioactive P pools over the growing season. Dry matter production was unaff ected by Fe at both application rates. Phosphorus solubility and plant uptake were reduced at the 1:3 P:Fe molar ratio rate, in spite of the legumes' reported ability to secrete siderophores. Within-season changes in bioactive P fractions indicated that P was taken up from the inorganic (water-extractable P [WEP] + inorganic ligand-exchangeable P [EEP i ]) pools. Comparing soil P pools in cropped and noncropped soils, the decrease in the organic phosphohydrolaselabile P (PHP) pool corroborated the fact that the PHP pool replenished the WEP + EEP i fractions. Although Mehlich 3 P and EEP i were related, the Mehlich 3 P pool showed no signifi cant relationship with whole plant or any plant part P. Th e latter did not perform as well as the EEP i pool in assessing plant availability and enzymatically mediated turnover of immobilized P.

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“…Aerobes produce and secrete over 500 different types of siderophores 25 , which accumulate in the environment due to their good stability. Hydroxamate-type siderophores in soil have been reported as high as 10 µM 26 . In addition, aerobes often suffer from carbon starvation in the environment 27 .…”

Section: Figmentioning

confidence: 99%

Siderophores provoke extracellular superoxide production by carbon-starvingArthrobacterstrains when carbon sources recover

Ning

Liang

Men³

et al. 2020

Preprint

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Superoxide and other reactive oxygen species (ROS) in the 2 0 environment shape microbial communities 1 and drive transformation of metals 2,3 2 1 and inorganic/organic matter 4,5 . Taxonomically diverse bacteria and 2 2 phytoplankton can produce extracellular superoxide during laboratory 2 3 cultivation 6-11 . Understanding the physiological reasons for extracellular 2 4 superoxide production by aerobes in the environment is a crucial question yet 2 5 not fully solved. Here, we showed that iron-starving Arthrobacter sp. QXT-31 2 6 (referred to as A. QXT-31 hereafter) secreted a type of siderophore 2 7 (deferoxamine, DFO), which provoked extracellular superoxide production by 2 8 carbon-starving A. QXT-31 when carbon sources were recovered. Several other 2 9 siderophores also demonstrated similar effects. RNA-Seq data hinted that DFO 3 0 stripped iron from iron-bearing proteins in the electron transfer chain (ETC) of 3 1 metabolically active A. QXT-31, resulting in electron leakage from the 3 2 electron-rich (resulting from carbons source metabolism) ETC and superoxide 3 3 production. Considering that most aerobes secrete siderophore(s) 12 and often 3 4 suffer from carbon starvation in the environment, certain aerobes are expected 3 5 to produce extracellular superoxide when carbon source(s) recover/fluctuate, thus 3 6influencing the microbial community and cycling of many elements. In addition, 3 7 an artificial iron-chelator (diethylenetriamine pentaacetic acid, DTPA) was 3 8 widely used in microbial superoxide quantification. Our results showed that 3 9

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Siderophore Utilization by Bradyrhizobium japonicum

Cited by 73 publications

References 21 publications

Leguminosae native nodulating bacteria from a gold mine As-contaminated soil: Multi-resistance to trace elements, and possible role in plant growth and mineral nutrition

Leguminosae native nodulating bacteria from a gold mine As-contaminated soil: Multi-resistance to trace elements, and possible role in plant growth and mineral nutrition

Relationships between Immobilized Phosphorus Uptake in Two Grain Legumes and Soil Bioactive Phosphorus Pools in Fertilized and Manure‐Amended Soil

Siderophores provoke extracellular superoxide production by carbon-starvingArthrobacterstrains when carbon sources recover

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