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Arbuscular mycorrhizal fungal communities and Rhizophagus irregularis populations shift in response to short-term ploughing and fertilisation in a buffer strip

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Abstract

Short-term effects of soil physical disturbance by ploughing and nitrogen and phosphate fertilisation on arbuscular mycorrhizal fungal (AMF) communities and on intraspecific populations of Rhizophagus irregularis in a buffer strip surrounded by arable fields were studied. Pre-grown Plantago lanceolata plantlets were transplanted into fertilised and/or ploughed experimental plots. After 3 months, the glomeromycotan communities in the roots of these trap plants were analysed using 454 pyrosequencing of a fragment of the RNA polymerase II gene (RPB1). Intraspecific populations of R. irregularis were studied by restriction fragment length polymorphism (RFLP) analysis of the mitochondrial large ribosomal subunit (mtLSU) gene. Soil disturbance significantly increased the diversity of species-level molecular taxa (MTs) and altered community structure, whilst fertilisation alone had no significant effect, unless coupled with ploughing. At the population level, the expected shift from genotypes of R. irregularis typically found in grasslands to those usually found in arable sites was only partially observed. In conclusion, in the short-term, physical soil disturbance, as well as nitrogen fertilisation when coupled with physical soil disturbance, affected AMF community and to a smaller extent population composition.

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Acknowledgments

The authors are grateful to Marie-Hélène Bernicaut, Philippe Chamois, Annie Colombet, Odile Chatagnier, Bernard Alixant, Eric Bernaud, Diederik van Tuinen, Romain Barnard, Aymé Spor and Nassybat Binti Said Ismaïl for their helpful participation and comments in this study, which was funded by the gratefully acknowledged Burgundy Region (FABER programme no. 2010-9201AAO047S01404).

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The authors declare that they have no competing interest.

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Correspondence to D. Redecker.

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Online Resource 1

Schematic representation of the experimental set-up used at the experimental domain of Epoisses at Bretenières, Burgundy region, France. a. Overview of the experimental design: unploughed plots are shown in grey, ploughed plots in white. Fertilisation treatments (+N, 100 kg ha−1 of nitrogen; +P, 30 kg ha−1 of phosphorus; +N+P, combined fertilisation; C, no fertilisation) were randomly arranged within each strip of the ploughing treatment. b. Zoom on a plot showing planting pattern of Plantago lanceolata trap plant, pre-grown in a climate chamber during 1 month. (PDF 322 kb)

Online Resource 2

Sequences used for the RPB1 reference tree. Bold characters refer to new sequences. (PDF 508 kb)

Online Resource 3

Maximum likelihood tree of RPB1 sequences used as reference tree to assign operational taxonomic units to molecular taxa (MTs). Branch support values are based on 1000 bootstrap replicates using RAxML software. Mortierella verticillata and Mucor hiemalis were chosen as outgroups to root the tree. (PDF 333 kb)

Online Resource 4

Accumulation curve analysis of observed OTU numbers versus cumulative sequence number by sample (different colours) before (a) and after (b) subsampling to a 1400 sequence threshold (represented by the dotted line). (PDF 569 kb)

Online Resource 5

Number of RPB1 sequence reads retained per sample after sub-sampling to a threshold of 1400 sequence reads at the species-level molecular taxa (MT). Numbers of OTUs found for each MT are in brackets. (PDF 492 kb)

Online Resource 6

Data table of Plantago lanceolata fresh shoot weight, dry root weight and root colonisation parameters (estimation by Trouvelot et al. 1986) and estimation of plant species richness found in each plot (other than P. lanceolata) according to soil treatment (physical soil disturbance and fertilisation treatments). (PDF 169 kb)

Online Resource 7

Statistical significance (P value) of indicator species analysis based on species-level molecular taxa (MT) after sub-sampling to a threshold of 1400 sequences. Only species with more than 100 sequences over the total read number and having both sensitivity and specificity values higher than 0.75 were kept. (PDF 261 kb)

Online Resource 8

Variance of species abundance reads using a nested linear mixed model showing effects of nitrogen and phosphorus fertilisation within the physical soil disturbance treatments randomised by block. Significant results (P < 0.05) are in bold type. Red dollar symbols show indicator species identified by the De Caceres-Jansen index using 2000 permutations. (PDF 297 kb)

Online Resource 9

Restriction fragment length polymorphism patterns (=RFLP types) of the mitochondrial rRNA subunit gene region from root-colonising Rhizophagus irregularis, obtained using primers RNL-29/ RNL-30. Numbers of clones of each RFLP type are listed per treatment. (PDF 455 kb)

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Peyret-Guzzon, M., Stockinger, H., Bouffaud, ML. et al. Arbuscular mycorrhizal fungal communities and Rhizophagus irregularis populations shift in response to short-term ploughing and fertilisation in a buffer strip. Mycorrhiza 26, 33–46 (2016). https://doi.org/10.1007/s00572-015-0644-5

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  • DOI: https://doi.org/10.1007/s00572-015-0644-5

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