Ectomycorrhizal utilization of different phosphorus sources in a glacier forefront in the Italian Alps

Michele D’Amico, Juan Pablo Almeida, Sonia Barbieri, Fabio Castelli, Elena Sgura, Giulia Sineo, Maria Martin, Eleonora Bonifacio, Håkan Wallander, Luisella Celi

Research output: Contribution to journalArticlepeer-review

5 Citations (SciVal)

Abstract

Aims: In deglaciated surfaces, lithology influences habitat development. In particular, serpentinite inhibits soil evolution and plant colonization because of insufficient phosphorus (P) content, among other stressful properties. In nutrient-poor environments, ectomycorrhizal fungi (EMF) play a key role exploring the soil for P beyond the rhizosphere. In this study, we followed the role of EMF in accessing inorganic and organic P along two proglacial soil chronosequences in the Alps (NW Italy), respectively characterized by pure serpentinite till and serpentinite mixed with 10% of gneiss, and colonized by European Larch. 

Methods: The access to inorganic and organic P forms by EMF was studied using specific mesh-bags for fungal hyphae entry, filled with quartz sand and inorganic phosphate (Pi) or myo-inositolhexaphosphate (InsP6) adsorbed onto goethite. They were incubated over 13 months at the organic/mineral horizon interface. After harvesting, EMF colonization via ergosterol analysis and the amount of P and Fe removed from mesh bags were measured. 

Results: Ergosterol increased along the two chronosequences with slightly greater values on serpentinite and in Pi-containing bags. Up to 65% of Pi was removed from mesh-bags, only partly accompanied by a parallel release of Fe. The amount of InsP6 released was instead less than 45% and mostly removed with goethite. 

Conclusions: The results suggest that, in extremely P-poor environments, EMF are able to release both inorganic and organic P forms from highly stabilized associations.

Original languageEnglish
Pages (from-to)81-95
Number of pages15
JournalPlant and Soil
Volume446
Issue number1-2
Early online date2019 Nov 12
DOIs
Publication statusPublished - 2020 Jan

Subject classification (UKÄ)

  • Soil Science
  • Geochemistry

Keywords

  • Ectomycorrhizae
  • Mesh bags experiment
  • Phosphorus uptake
  • Primary succession
  • Serpentinite soils
  • Soil chronosequence

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