Host- and stage-dependent secretome of the arbuscular mycorrhizal fungus Rhizophagus irregularis

Tian Zeng, Rens Holmer, Jan Hontelez, Bas te Lintel-Hekkert, Lucky Marufu, Thijs de Zeeuw, Fangyuan Wu, Elio Schijlen, Ton Bisseling, Erik Limpens*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

30 Citations (Scopus)

Abstract

Arbuscular mycorrhizal fungi form the most wide‐spread endosymbiosis with plants. There is very little host‐specificity in this interaction, however host preferences as well as varying symbiotic efficiencies have been observed. We hypothesize that secreted proteins (SPs) may act as fungal effectors to control symbiotic efficiency in a host‐dependent manner. Therefore, we studied whether AM fungi adjust their secretome in a host‐ and stage‐dependent manner to contribute to their extremely wide host‐range. We investigated the expression of SP‐encoding genes of Rhizophagus irregularis in three evolutionary distantly‐related plant species, Medicago truncatula, Nicotiana benthamiana and Allium schoenoprasum. In addition we used laser microdissection in combination with RNAseq to study SP expression at different stages of the interaction in Medicago. Our data indicate that most expressed SPs show roughly equal expression levels in the interaction with all three host plants. In addition, a subset shows significant differential expression depending on the host plant. Furthermore, SP expression is controlled locally in the hyphal network in response to host dependent cues. Overall, this study presents a comprehensive analysis of the R. irregularis secretome, which now offers a solid basis to direct functional studies on the role of fungal SPs in AM symbiosis.
Original languageEnglish
Pages (from-to)411-425
JournalThe Plant Journal
Volume94
Issue number3
DOIs
Publication statusPublished - May 2018

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