Enzymatic hydrolysis of organic phosphorus.

Quiquampoix, Hervé; Mousain, Daniel; Turner, B. L.; Frossard, Emmanuel; Baldwin, Darren S.

doi:10.1079/9780851998220.0089

Cited by 108 publications

(67 citation statements)

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“…Inositol phosphates, phospholipids and nucleic acids are the dominant forms of organic phosphorylated compounds in soils (Quiquampoix and Mousain 2005) and inositol phosphates have been reported to be the main form of organic phosphorus (Po) in soil (Dalal, 1977). Because actinomycetes are widely distributed in different soil ecosystems, it has been assumed that they are capable of hydrolyzing phytate (myo-inositol (1,2,3,4,5,6) hexakisphosphate).…”

Section: Soil Characteristics and Actinomycetes Populationmentioning

confidence: 99%

Distribution of actinomycetes in different soil ecosystems and effect of media composition on extracellular phosphatase activity

Ghorbani-Nasrabadi

Greiner

Khonakdar

et al. 2013

J. Soil Sci. Plant Nutr.

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Actinomycetes are widely distributed in different habitats and involved in important processes. Therefore, evaluation of their distribution is important in understanding their ecological role. Ninety seven samples were taken from different soil ecosystems (forest, pasture, rain-fed and irrigated cultivated land) located in various climatic zones in the province of Golestan, Northeast Iran. The number of actinomycetes as well as pH value, organic carbon (OC) and soil salinity expressed as electrical conductivity (EC) showed significant differences in the soil ecosystems under investigation. The number of actinomycetes decreased from 2.86 * 10 6 cfu g -1 in irrigated cultivated land to 7* 10 5 cfu g -1 in pasture (p<0.01). In pastures, the number of actinomycetes was negatively correlated with EC (r=-0.60, n=15, p<0.001) and pH (r=-0.59, n=15, p<0.001). In other soil ecosystems under investigation no significant correlations between soil pH, OC and EC and the number of actinomycetes could be found. In forest soils, the number of actinomycetes was significantly dependent (p<0.05) on climate. A significantly higher population was observed under semi-arid conditions compared to all other climatic zones (humid, sub-humid, Mediterranean). Because many soil microorganisms are able to transform different forms of insoluble organic and inorganic phosphorus into a soluble form suitable for plant uptake, the capacity of the isolated actinomycetes to secrete phosphatase activity was determined under laboratory conditions. A huge variation in the capacities to produce acid and alkaline phosphatases among the different isolates was observed. These enzyme activities and the capacities to hydrolyze phytate in the fermentation broth were significantly dependent on medium composition. In general, substitution of arginine and glycerol in the modified glycerol arginine medium (MGA) with other nitrogen and carbon sources resulted in a significant reduction of phytate dephosphorylation.

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Section: Soil Characteristics and Actinomycetes Populationmentioning

confidence: 99%

Distribution of actinomycetes in different soil ecosystems and effect of media composition on extracellular phosphatase activity

Ghorbani-Nasrabadi

Greiner

Khonakdar

et al. 2013

J. Soil Sci. Plant Nutr.

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“…A recent study revealed that two fungal phytases are rapidly absorbed to the soil solid phase, their physicochemical properties affecting their mobility, temporal stability and capacity to hydrolyze inositol phosphate in soil 24) . Absorption of microbial phytases may also reduce their affinity for inositol phosphate and thus reduce their effective activity 84) . Moreover, the effectiveness of phytases in increasing the availability of P to plants may be further limited by the concentration of organic P forms in the soil solution 22) .…”

Section: Phytate-producing Bacteria As Plant Growth-promoting Agentsmentioning

confidence: 99%

Current and Future Biotechnological Applications of Bacterial Phytases and Phytase-Producing Bacteria

et al. 2008

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Phytases are a group of enzymes capable of releasing phosphate from phytate, one of the most abundant forms of organic phosphate in the natural environment. Phytases can be found in many organisms; in bacteria, they are particularly described in γ-proteobacteria. In recent years, bacterial phytases have been isolated, characterized and proposed as potential tools in biotechnology. Microbial phytases have been applied mainly to animal (swine and poultry) and human foodstuffs in order to improve mineral bioavailability and food processing. Here, we summarize the current knowledge of bacterial phytases and phytase-producing bacteria, as well as their potential biotechnological applications, including new fields poorly explored, such as fish nutrition, environmental protection and plant nutrition. Despite the recognized importance in biotechnology, information on bacterial phytases and phytase-producing bacteria is clearly limited and major efforts are required to improve the knowledge of phytases present in bacteria and their utilization.

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“…The enzyme N-acetyl b-glucosaminidase is mostly present in soils in extracellular forms (Parham and Deng 2000) and can be produced by microorganisms in response to N-deficiency to acquire N from organic matter (Sinsabaugh and Moorhead 1994;Olander and Vitousek 2000;Muruganandama et al 2009). Phosphomonoesterase is released by microorganisms in response to phosphorus (P) deficiency to hydrolyze ester bonds between C and P in organic matter and liberate orthophosphate (Quiquampoix and Mousain 2005). Activity of these enzymes can indicate microbial mineralization of nutrients from organic matter due to N or P demand (Olander and Vitousek 2000;Allison et al 2007;Sinsabaugh et al 2008) and consequently may provide a useful indication of nutrient limitation during priming.…”

Section: Introductionmentioning

confidence: 99%

Priming and microbial nutrient limitation in lowland tropical forest soils of contrasting fertility

et al. 2011

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Enzymatic hydrolysis of organic phosphorus.

Cited by 108 publications

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Distribution of actinomycetes in different soil ecosystems and effect of media composition on extracellular phosphatase activity

Distribution of actinomycetes in different soil ecosystems and effect of media composition on extracellular phosphatase activity

Current and Future Biotechnological Applications of Bacterial Phytases and Phytase-Producing Bacteria

Priming and microbial nutrient limitation in lowland tropical forest soils of contrasting fertility

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