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The plasma membrane proteome of Medicago truncatula roots as modified by arbuscular mycorrhizal symbiosis


In arbuscular mycorrhizal (AM) roots, the plasma membrane (PM) of the host plant is involved in all developmental stages of the symbiotic interaction, from initial recognition to intracellular accommodation of intra-radical hyphae and arbuscules. Although the role of the PM as the agent for cellular morphogenesis and nutrient exchange is especially accentuated in endosymbiosis, very little is known regarding the PM protein composition of mycorrhizal roots. To obtain a global overview at the proteome level of the host PM proteins as modified by symbiosis, we performed a comparative protein profiling of PM fractions from Medicago truncatula roots either inoculated or not with the AM fungus Rhizophagus irregularis. PM proteins were isolated from root microsomes using an optimized discontinuous sucrose gradient; their subsequent analysis by liquid chromatography followed by mass spectrometry (MS) identified 674 proteins. Cross-species sequence homology searches combined with MS-based quantification clearly confirmed enrichment in PM-associated proteins and depletion of major microsomal contaminants. Changes in protein amounts between the PM proteomes of mycorrhizal and non-mycorrhizal roots were monitored further by spectral counting. This workflow identified a set of 82 mycorrhiza-responsive proteins that provided insights into the plant PM response to mycorrhizal symbiosis. Among them, the association of one third of the mycorrhiza-responsive proteins with detergent-resistant membranes pointed at partitioning to PM microdomains. The PM-associated proteins responsive to mycorrhization also supported host plant control of sugar uptake to limit fungal colonization, and lipid turnover events in the PM fraction of symbiotic roots. Because of the depletion upon symbiosis of proteins mediating the replacement of phospholipids by phosphorus-free lipids in the plasmalemma, we propose a role of phosphate nutrition in the PM composition of mycorrhizal roots.

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We are grateful to Pr. Nathalie Leborgne-Castel (Université de Bourgogne, France) for providing the AHA protein purified from the plasma membrane of Nicotiana tabacum. The authors acknowledge financial support by the French ANR (TRANSMUT ANR-10-BLAN-1604-0) and the Burgundy Regional Council (PARI Agrale 8).

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Correspondence to Ghislaine Recorbet.

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Additional file 1

Development of R. irregularis within roots of 4-week-old M. truncatula plants. (PPTX 51 kb).

Additional file 2

List of the 674 plant proteins identified in the PM-enriched fractions originating from AM and NM roots of M. truncatula. (XLSX 1283 kb).

Additional file 3

List of the 531 microsomal proteins identified in M. truncatula roots, which have Arabidopsis homologues of known localization. (XLSX 11437 kb).

Additional file 4

Transcript array data from the M. truncatula Gene Atlas corresponding to the root PM-associated proteins displaying induction upon AM symbiosis. (DOCX 48 kb).

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Aloui, A., Recorbet, G., Lemaître-Guillier, C. et al. The plasma membrane proteome of Medicago truncatula roots as modified by arbuscular mycorrhizal symbiosis. Mycorrhiza 28, 1–16 (2018). https://doi.org/10.1007/s00572-017-0789-5

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  • Root plasma membrane proteins
  • Proteomics
  • Spectral counting
  • Rhizophagus irregularis
  • Medicago truncatula