Identification of in planta-expressed arbuscular mycorrhizal fungal proteins upon comparison of the root proteomes of Medicago truncatula colonised with two Glomus species.

Fungal genetics and biology : FG & B

PubMedID: 20226871

Recorbet G, Valot B, Robert F, Gianinazzi-Pearson V, Dumas-Gaudot E. Identification of in planta-expressed arbuscular mycorrhizal fungal proteins upon comparison of the root proteomes of Medicago truncatula colonised with two Glomus species. Fungal Genet Biol. 2010;47(7):608-18.
In the absence of sequenced genomes for arbuscular mycorrhizal (AM) fungi, their obligatory biotrophy makes their intra-radical biology especially recalcitrant to functional analyses. Because tandem mass spectrometry-based proteomics enables fungal gene product identifications in phyla lacking genomic information, we have compared as a way to enlarge the coverage of in planta expressed-mycorrhiza-related proteins, the root proteome responses of Medicago truncatula upon colonisation with two AM fungi, Glomus mosseae and G. intraradices, using two-dimensional electrophoresis. In contrast to phosphate fertilization, mycorrhization led to specific changes in the abundance of 99 spots, including 42 overlapping modifications between G. mosseae- and G. intraradices-colonised roots. The 32 confident identifications that could be retrieved following tandem mass spectrometry encompassed 21 fungal proteins whose homology-inferred functions were found to complement the working models so far proposed for the intra-radical functioning of AM fungi with regard to carbon utilization, energy generation, redox homeostasis and protein turnover-related processes.