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

D’Amico, Michele ; Almeida, Juan Pablo LU ; Barbieri, Sonia LU ; Castelli, Fabio LU ; Sgura, Elena LU ; Sineo, Giulia LU ; Martin, Maria ; Bonifacio, Eleonora ; Wallander, Håkan LU and Celi, Luisella (2020) In Plant and Soil 446(1-2). p.81-95
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ectomycorrhizae, Mesh bags experiment, Phosphorus uptake, Primary succession, Serpentinite soils, Soil chronosequence
in
Plant and Soil
volume
446
issue
1-2
pages
15 pages
publisher
Springer
external identifiers
  • scopus:85075123299
ISSN
0032-079X
DOI
10.1007/s11104-019-04342-0
language
English
LU publication?
yes
id
0cf52eab-d781-4bc5-9272-074526351909
date added to LUP
2019-12-10 12:59:08
date last changed
2021-04-15 14:38:25
@article{0cf52eab-d781-4bc5-9272-074526351909,
  abstract     = {<p>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. </p><p>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. </p><p>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. </p><p>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.</p>},
  author       = {D’Amico, Michele and Almeida, Juan Pablo and Barbieri, Sonia and Castelli, Fabio and Sgura, Elena and Sineo, Giulia and Martin, Maria and Bonifacio, Eleonora and Wallander, Håkan and Celi, Luisella},
  issn         = {0032-079X},
  language     = {eng},
  number       = {1-2},
  pages        = {81--95},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Ectomycorrhizal utilization of different phosphorus sources in a glacier forefront in the Italian Alps},
  url          = {http://dx.doi.org/10.1007/s11104-019-04342-0},
  doi          = {10.1007/s11104-019-04342-0},
  volume       = {446},
  year         = {2020},
}