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Phosphorus depletion in forest soils shapes bacterial communities towards phosphorus recycling systems (2016)

Bergkemper F., Schöler A., Engel M., Lang F., Krüger J., Schloter M., Schulz S.

Environmental Microbiology, 18 (6), 1988-2000



Phosphorus (P) is an important macronutrient for allbiota on earth but similarly a finite resource. Microor-ganisms play on both sides of the fence as they effec-tively  mineralize  organic  and  solubilize  precipitatedforms of soil phosphorus but conversely also take upand immobilize P. Therefore, we analysed the role ofmicrobes in two beech forest soils with high and lowP   content   by   direct   sequencing   of   metagenomicdeoxyribonucleic acid. For inorganic P solubilization,a    significantly    higher    microbial    potential    wasdetected   in   the   P-rich   soil.   This   trait   especiallyreferred  toCandidatusSolibacter  usiatus,  likewiseone  of  the  dominating  species  in  the  data  sets.  Ahigher  microbial  potential  for  efficient  phosphateuptake   systems   (pstSCAB)   was   detected   in   theP-depleted   soil.   Genes   involved   in   P   starvationresponse regulation (phoB,phoR) were prevalent inboth soils. This underlines the importance of effectivephosphate (Pho) regulon control for microorganismsto use alternative P sources during phosphate limita-tion.  Predicted  genes  were  primarily  harboured  byRhizobiales, Actinomycetales and Acidobacteriales.