Original Paper

Mycorrhiza

, Volume 20, Issue 6, pp 427-443

First online:

Symbiosis-related pea genes modulate fungal and plant gene expression during the arbuscule stage of mycorrhiza with Glomus intraradices

  • Elena KuznetsovaAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSELaboratory of Genetics of Plant Microbe Interactions, Department of Biotechnology, All-Russia Research Institute for Agricultural Microbiology
  • , Pascale M. A. Seddas-DozolmeAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE
  • , Christine ArnouldAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE
  • , Marie TollotAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE
  • , Diederik van TuinenAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE
  • , Alexey BorisovAffiliated withLaboratory of Genetics of Plant Microbe Interactions, Department of Biotechnology, All-Russia Research Institute for Agricultural Microbiology
  • , Silvio GianinazziAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE
  • , Vivienne Gianinazzi-PearsonAffiliated withUMR 1088 INRA/5184 CNRS/Université de Bourgogne Plante–Microbe–Environnement, INRA-CMSE Email author 

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Abstract

The arbuscular mycorrhiza association results from a successful interaction between genomes of the plant and fungal symbiotic partners. In this study, we analyzed the effect of inactivation of late-stage symbiosis-related pea genes on symbiosis-associated fungal and plant molecular responses in order to gain insight into their role in the functional mycorrhizal association. The expression of a subset of ten fungal and eight plant genes, previously reported to be activated during mycorrhiza development, was compared in Glomus intraradices-inoculated wild-type and isogenic genotypes of pea mutated for the PsSym36, PsSym33, and PsSym40 genes where arbuscule formation is inhibited or fungal turnover modulated, respectively. Microdissection was used to corroborate arbuscule-related fungal gene expression. Molecular responses varied between pea genotypes and with fungal development. Most of the fungal genes were downregulated when arbuscule formation was defective, and several were upregulated with more rapid fungal development. Some of the plant genes were also affected by inactivation of the PsSym36, PsSym33, and PsSym40 loci, but in a more time-dependent way during root colonization by G. intraradices. Results indicate a role of the late-stage symbiosis-related pea genes not only in mycorrhiza development but also in the symbiotic functioning of arbuscule-containing cells.

Keywords

Glomus intraradices Pisum sativum Symbiosis-related plant mutants Gene expression Laser microdissection