Medicago species affect the community composition of arbuscular mycorrhizal fungi associated with roots

B. Pivato, S. Mazurier, P. Lemanceau, S. Siblot, G. Berta, C. Mougel, D. Van Tuinen

Research output: Contribution to journalArticlepeer-review

Abstract

• Sequencing of the 5′ end of the large ribosomal subunit (LSU rDNA) and quantitative polymerase chain reaction (qPCR) were combined to assess the impact of four annual Medicago species (Medicago laciniata, Medicago murex, Medicago polymorpha and Medicago truncatula) on the genetic diversity of arbuscular mycorrhizal (AM) fungi, and on the relative abundance of representative AM fungal genotypes, in a silty-thin clay soil (Mas d'Imbert, France). • Two hundred and forty-six Glomeromycete LSU rDNA sequences from the four plant species and the bulk soil were analysed. The high bootstrap values of the phylogenetic tree obtained allowed the delineation of 12 operational taxonomic units (OTUs), all belonging to Glomus. • Specific primers targeting Glomeromycetes and major OTUs were applied to quantify their abundance by qPCR. Glomeromycetes and targeted OTUs were significantly more abundant in the root tissues than in the bulk soil, and the frequencies of three of them differed significantly in the root tissues of the different plant species. • These differences indicate that, despite the absence of strict host specificity in mycorrhizal symbiosis, there was a preferential association between some AM fungal and plant genotypes.

Original languageEnglish
Pages (from-to)197-210
Number of pages14
JournalNew Phytologist
Volume176
Issue number1
DOIs
Publication statusPublished - Oct 2007
Externally publishedYes

Keywords

  • Annual medics
  • Arbuscular mycorrhizal (AM) fungi
  • Genetic diversity
  • Large ribosomal subunit (LSU rDNA)
  • Quantitative polymerase chain reaction

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