Mycorrhiza

, Volume 27, Issue 2, pp 109–128 | Cite as

Oak protein profile alterations upon root colonization by an ectomycorrhizal fungus

  • Mónica Sebastiana
  • Joana Martins
  • Andreia Figueiredo
  • Filipa Monteiro
  • Jordi Sardans
  • Josep Peñuelas
  • Anabela Silva
  • Peter Roepstorff
  • Maria Salomé Pais
  • Ana Varela Coelho
Original Article

Abstract

An increased knowledge on the real impacts of ectomycorrhizal symbiosis in forest species is needed to optimize forest sustainable productivity and thus to improve forest services and their capacity to act as carbon sinks. In this study, we investigated the response of an oak species to ectomycorrhizae formation using a proteomics approach complemented by biochemical analysis of carbohydrate levels. Comparative proteome analysis between mycorrhizal and nonmycorrhizal cork oak plants revealed no differences at the foliar level. However, the protein profile of 34 unique oak proteins was altered in the roots. Consistent with the results of the biochemical analysis, the proteome analysis of the mycorrhizal roots suggests a decreasing utilization of sucrose for the metabolic activity of mycorrhizal roots which is consistent with an increased allocation of carbohydrates from the plant to the fungus in order to sustain the symbiosis. In addition, a promotion of protein unfolding mechanisms, attenuation of defense reactions, increased nutrient mobilization from the plant-fungus interface (N and P), as well as cytoskeleton rearrangements and induction of plant cell wall loosening for fungal root accommodation in colonized roots are also suggested by the results. The suggested improvement in root capacity to take up nutrients accompanied by an increase of root biomass without apparent changes in aboveground biomass strongly re-enforces the potential of mycorrhizal inoculation to improve cork oak forest resistance capacity to cope with coming climate change.

Keywords

Cork oak Ectomycorrhizae Symbiosis Proteome Mass spectrometry Differential in gel electrophoresis (DIGE) 

Supplementary material

572_2016_734_MOESM1_ESM.xlsx (13 kb)
Online resource 1 (Supplementary Table 1)Quantitative analysis of the protein spots. Column A: spot number; Column B: normalised spot volume in mycorrhizal roots according to Progenesis SameSpot; Column C: spot volume upon correction for the 0.93:0.07 plant-fungal proportion in mycorrhizal roots; Column D: normalised spot volume in non-mycorrhizal roots according to Progenesis SameSpot; Column E: Fold Change (FC) between mycorrhizal and non-mycorrhizal roots calculated as C/D; Column F: for representation proposes, a −1/FC transformation was applied to FC values between 0 and 1 (down-accumulated spots). (XLSX 12 kb)
572_2016_734_MOESM2_ESM.docx (13 kb)
Online resource 2 (Supplementary Table 2)Target genes for real-time PCR analysis: accession in cork oak transcriptome database (www.corkoakdb.org), primers sequences, annealing (Ta) and melting (Tm) temperature. (DOCX 12 kb)
572_2016_734_Fig5_ESM.gif (233 kb)
Online resource 3 (Supplementary Fig. 1)

The interaction between P. tinctorius and the roots of cork oak. (a) Example of a colonized (right) and a non-colonized (left) plant. (b) Non-inoculated roots. (c) Colonized root, 2 months after inoculation with P. tinctorius. (d) Transverse section of a colonized root (2 months after inoculation) showing the fungal mantle (m) surrounding the root and the Hartig net (hn) on root epidermal cells; scale 50 μm (Sebastiana et al. 2014). (GIF 232 kb)

572_2016_734_MOESM3_ESM.tif (16.3 mb)
High resulotion image (TIF 16736 kb)
572_2016_734_Fig6_ESM.gif (141 kb)
Online resource 4 (Supplementary Fig. 2)

Representative images of Cy labelled 2-DE gels for mycorrhizal leaves (A) and non-mycorrhizal leaves (B) (GIF 140 kb)

572_2016_734_MOESM4_ESM.tif (14.3 mb)
High resulotion image (TIF 14614 kb)
572_2016_734_MOESM5_ESM.xlsx (32 kb)
Online resource 5 (Supplementary Table 3)The identity of differentially expressed protein spots as determined by tandem mass spectrometry. (XLSX 31 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Mónica Sebastiana
    • 1
  • Joana Martins
    • 2
  • Andreia Figueiredo
    • 1
  • Filipa Monteiro
    • 1
  • Jordi Sardans
    • 3
    • 4
  • Josep Peñuelas
    • 3
    • 4
  • Anabela Silva
    • 1
  • Peter Roepstorff
    • 5
  • Maria Salomé Pais
    • 1
  • Ana Varela Coelho
    • 2
  1. 1.Plant Functional Genomics Unit, Biosystems & Integrative Sciences Institute (BioISI), Faculty of SciencesLisbon UniversityLisbonPortugal
  2. 2.Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeirasPortugal
  3. 3.CSIC, Global Ecology Unit, CREAF-CSIC-UABCerdanyola del VallèsSpain
  4. 4.CREAFCerdanyola del VallèsSpain
  5. 5.Department of Biochemistry and Molecular BiologyUniversity of Southern DenmarkOdense MDenmark

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