Soil Microorganisms Mediating Phosphorus Availability Update on Microbial Phosphorus

Richardson, Alan; Simpson, Richard J.

doi:10.1104/pp.111.175448

Cited by 1,158 publications

(663 citation statements)

References 73 publications

(88 reference statements)

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“…However, such observations do not provide a mechanistic explanation for specific geochemical influences on soil microbial conditions; whereas new data here show that explicit soil forming processes and differences in soil mineralogy significantly correlate with local pH and P on regional scale, which in turn, significantly correlates with both bacterial and Type I gene abundances. Further, correlation of microbial abundances with soil P is consistent with the known ability of microbial communities to mediate the transfer of P between pools regarded as either 'unavailable' or 'available' (via a range of enzymatic and chemical leaching mechanisms; Richardson and Simpson 2011) and also with low C/P ratios across the region.…”

Section: Regional Geology and Soil Geochemistrymentioning

confidence: 53%

“…Total and 'available' P significantly correlated among soils tested (p \ 0.05); however, total P encompasses all of the 'available' and 'unavailable' forms of P that are present in soils including inorganic (adsorbed, secondary and primary mineral forms) or organic (adsorbed and humic associated) components. The terms 'available' and 'unavailable' are operational terms used by plant physiologists, whereas microorganisms can mediate the release and transfer of P from all of these pools (Richardson and Simpson 2011). Therefore, total P was the main metric used for subsequent correlations with microbial abundances.…”

Section: Field Program and Samplingmentioning

confidence: 99%

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Soil geochemistry confines microbial abundances across an arctic landscape; implications for net carbon exchange with the atmosphere

et al. 2014

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A large portion of the World's terrestrial organic carbon is stored in Arctic permafrost soils. However, due to permafrost warming and increased in situ microbial mineralisation of released carbon, greenhouse gas releases from Arctic soils are increasing, including methane (CH 4(g) ). To identify environmental controls on such releases, we characterised soil geochemistry and microbial community conditions in 13 near-surface Arctic soils collected across Kongsfjorden, Svalbard. Statistically significant correlations were found between proxies for carbonate mineral content (i.e. Ca and Mg) and soil pH (Spearman rho = 0.87, p \ 0.001). In turn, pH significantly inversely correlated with bacterial and Type I methanotroph gene abundances across the soils (r = -0.71, p = 0.01 and r = -0.74, p = 0.006, respectively), which also co-varied with soil phosphorous (P) level (r = 0.79, p = 0.01 and r = 0.63, p = 0.02, respectively). These results suggest that soil P supply, which is controlled by pH and other factors, significantly influences in situ microbial abundances in these Arctic soils. Overall, we conclude microbial responses to increasing 'old carbon' releases in this Arctic region are constrained by nutrient-deficiency in surface soils, with consequential impacts on the flux and composition of carbon gasses released to the atmosphere.

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Section: Regional Geology and Soil Geochemistrymentioning

confidence: 53%

Section: Field Program and Samplingmentioning

confidence: 99%

Soil geochemistry confines microbial abundances across an arctic landscape; implications for net carbon exchange with the atmosphere

et al. 2014

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“…These organisms (PGPRs) either directly solubilize and mineralize inorganic phosphorus or facilitate the mobility of the organic form through biogeochemical cycle for more efficient root uptake (Richardson and Simpson, 2011 (Zaidi et al, 2009). Explicitly, each genus act independently to facilitate the dissolution and uptake of phosphate via in vitro condition or other mechanisms (Ramachandran et al, 2007).The PSBs secrete different types of organic acids e.g., carboxylic acid, formic acid, propionic acid, lactic acid, glycolytic acid, fumaric and succinic acid (Vazquez et al, 2000).…”

Section: Phosphate Solubilizationmentioning

confidence: 99%

Plant Growth Promoting Rhizobacteria (PGPR): A Bioprotectant bioinoculant for Sustainable Agrobiology. A Review

Odoh¹

2017

Int. J. Adv. Res. Biol. Sci

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Plant growth promoting rhizobacteria (PGPR) involves the utilization of large array of soil bacteria to improve yield and plant growth. As free living and symbiotic rhizobacteria, PGPR colonizes extracellular and/or intracellular rhizoenvironment in search for carbon source while indirectly aiding plant growth. In the past few decades, focus has been on developing a biosafety agro base approach void of continuous burden on soil micro flora as a result of agrochemical application. However, with clear understanding of PGPR mechanisms of action; (i) biofertilization (ii) biostimulation (iii) and biocontrol, it create more hope on the possibility of curbing food insecurity, clean environmental sustenance and lower public health risk. Seeds or soil application of PGPRs inoculant enhances directly phosphates solubilization, atmospheric nitrogen fixation and secretion of plant hormones (indole acetic acid, gibberellins, cytokinins and ethylene) needed for growth and adaptation in stressed environment. As soil pathogen consistently rival the roles of these organisms, they (PGPRs)have developed over time wide spectrum of strategies in the form of systemic resistance, iron, space and nutrient competition, antibiotics synthesis, lytic acid production and hydrogen cyanide for efficient food productivity. In view of this, the review widen our scope on the use of PGPR as bioinoculant in sustainable agro practice and to serve as a wakeup call for it reception and implementation in the tropics where paucity of data on it use has long prevailed.

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“…The sources of phosphorus (P) in soil are available from organic phosphate compounds (Richardson & Simpson 2011) and inorganic phosphate compounds, mainly in the form of insoluble mineral complexes (Rodriguez et al 2006). Phosphate-solubilizing bacteria are able to solubilize phosphate inorganic compounds, for example, tricalcium phosphate, by the production of organic acids (Chen et al 2006).…”

Section: Sã O Borjamentioning

confidence: 99%

Screening of plant growth promoting bacteria associated with barley plants (Hordeum vulgare L.) cultivated in South Brazil

Pontes

Souza

Granada³

et al. 2015

Biota Neotrop.

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The occurrence of associations between bacteria and plant roots may be beneficial, neutral or detrimental. Plant growth promoting (PGP) bacteria form a heterogeneous group of beneficial microorganisms that can be found in the rhizosphere, the root surfaces or in association with host plant. The aim of this study was to isolate and characterize PGP bacteria associated to barley plants (Hordeum vulgare L.) aiming a future application as agricultural inoculant. One hundred and sixty bacterial strains were isolated from roots or rhizospheric soil of barley based on their growth in nitrogen-free selective media. They were evaluated for their ability to produce indolic compounds (ICs) and siderophores, and to solubilize tricalcium phosphate in in vitro assays. Most of them (74%) were able to synthesize ICs in the presence of the precursor L-tryptophan, while 57% of the isolates produced siderophores in Fe-limited liquid medium, and 17% were able to solubilize tricalcium phosphate.

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Soil Microorganisms Mediating Phosphorus Availability Update on Microbial Phosphorus

Cited by 1,158 publications

References 73 publications

Soil geochemistry confines microbial abundances across an arctic landscape; implications for net carbon exchange with the atmosphere

Soil geochemistry confines microbial abundances across an arctic landscape; implications for net carbon exchange with the atmosphere

Plant Growth Promoting Rhizobacteria (PGPR): A Bioprotectant bioinoculant for Sustainable Agrobiology. A Review

Screening of plant growth promoting bacteria associated with barley plants (Hordeum vulgare L.) cultivated in South Brazil

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