Phosphatase activity does not limit the microbial use of low molecular weight organic-P substrates in soil

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Fransson, Ann-MariLund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science,Lund University, Sweden (författare)

Phosphatase activity does not limit the microbial use of low molecular weight organic-P substrates in soil

Artikel/kapitelEngelska2007

Förlag, utgivningsår, omfång ...

Elsevier BV,2007

Nummerbeteckningar

LIBRIS-ID:oai:lup.lub.lu.se:60b0cf93-90a4-4e84-b5a4-6a2e422dce76
https://lup.lub.lu.se/record/666638URI
https://doi.org/10.1016/j.soilbio.2006.11.014DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-120573URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:art swepub-publicationtype
Ämneskategori:ref swepub-contenttype

Anmärkningar

Plant roots and soil microorganisms contain significant quantities of low molecular weight (MW) phosphorylated nucleosides and sugars. Consequently.. upon death these can represent a significant input of organic-P to the soil. Some of these organic-P substrates must first be dephosphorylated by phosphatases before being assimilated by the soil microbial community while others can be taken up directly from soil solution. To determine whether sorption or phosphatase activity was limiting the bioavailability of low MW organic-P in soil we compared the microbial uptake and C mineralization of a range of C-14-labeled organic-P substrates [glucose-6-phosphate, adenosine monophosphate (AMP), adenosine diphosphate (ADP) and adenosine triphosphate (ATP)] to that of the parent compounds (adenosine and glucose). In a fertile grassland soil we showed that at low organic-P substrate concentrations (< 0.5 mM) phosphatase activity did not limit microbial uptake or mineralization in comparison to their non-phosphorylated counterparts. However, at high substrate concentrations (1-10 mM) the mineralization of the organic-P compounds was significantly lower than that of the nonphosphorylated compounds suggesting that phosphatase activity or microbial transporter capacity limited bioavailability. Sorption to the solid phase followed the series glucose < adenosine < G-6-P < AMP < ADP=ATP. However, sorption of the organic-P compounds to the solid phase did not appear to greatly affect bioavailability. The high adenosine mineralization capacity of the microbial biomass suggests that nucleosides may represent a significant source of C and N to the soil microbial biomass. We conclude that at low organic-P substrate concentrations typical of those in soil, neither phosphatase activity nor sorption greatly limits their bioavailability.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Markvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Soil Science hsv//eng
phosphatases
sorption
organic phosphorus
mineralization
cycling
nutrient
dissolved organic nitrogen
extracellular enzyme activity
Forestry and Wood Technology

Biuppslag (personer, institutioner, konferenser, titlar ...)

Jones, David LUniversity of Wales, UK (författare)
Biologiska institutionenNaturvetenskapliga fakulteten (creator_code:org_t)

Sammanhörande titlar

Ingår i:Soil Biology & Biochemistry: Elsevier BV39:5, s. 1213-12170038-07171879-3428

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Soil Biology & Biochemistry (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Fransson, Ann-Ma ...; Jones, David L

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Ekologi

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Markvetenskap

Artiklar i publikationen: Soil Biology & B ...

Av lärosätet: Lunds universitet; Linnéuniversitetet

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