Root type is not an important driver of mycorrhizal colonisation in Brachypodium distachyon

Donn, Suzanne; Kawasaki, Akitomo; Delroy, Brendan; Chochois, Vincent; Watt, Michelle; Powell, Jeff R.

doi:10.1016/j.pedobi.2017.08.001

Cited by 13 publications

(21 citation statements)

References 64 publications

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“…Donn et al (2017) also reported for Brachypodium distachyon, a closely related species to our focal host plant, that only a small fraction of the observed variation in AMF community composition was due to differences among plant genotypes. This high variability is probably due to variation in the floristic landscapes where individual plants grow.…”

Section: Discussionsupporting

confidence: 63%

“…This focal plant species is a common grassland plant that has been shown to support a wide range of fungi (Bittebiere et al, 2019), as with other species of the same genus (Donn et al, 2017). This focal plant species is a common grassland plant that has been shown to support a wide range of fungi (Bittebiere et al, 2019), as with other species of the same genus (Donn et al, 2017).…”

Section: Introductionmentioning

confidence: 84%

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Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

et al. 2019

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Fungal communities in the root endosphere are heterogeneous at fine scale. The passenger hypothesis assumes that this heterogeneity is driven by host plant distribution. Plant composition and host plant configuration should then influence root fungal assemblages.We used a large-scale experimental design of 25 mixtures of grassland plants. We sampled Brachypodium pinnatum in each mesocosm, and used amplicon mass-sequencing to analyze the endospheric mycobiota. We used plant distribution maps to assess plant species richness and evenness (heterogeneity of composition), and patch size and the degree of isolation of B. pinnatum (heterogeneity of configuration) on fungal community assembly.The Glomeromycotina community in B. pinnatum roots was not related to either floristic heterogeneity or productivity. For Ascomycota, the composition of operational taxonomic units (OTUs) was driven by plant evenness while OTU richness decreased with plant richness. For Basidiomycota, richness increased with host plant aggregation and connectivity. Plant productivity influenced Ascomycota, inducing a shift in OTU composition and decreasing evenness.Plant heterogeneity modified root mycobiota, with potential direct (i.e. host preference) and indirect (i.e. adaptations to abiotic conditions driven by plant occurrence over time) effects. Plant communities can be envisioned as microlandscapes consisting of a variety of fungal niches.

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Section: Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 84%

Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

et al. 2019

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“…(), who reported that rainfall was the most important predictor of AM fungal communities in roots despite only explaining 6.7% of the variation. This high variability inherent of the AM fungal communities is increasingly being recognized as an important characteristic of their ecologies (Donn et al., ; Hart, Zaitsoff, van der Heyde, & Pither, ; Powell & Bennett, ) and creates further difficulties for predicting changes in those communities and associated functions. Current research is ongoing in this experimental system and is aiming to evaluate whether consideration of variation in soil properties—both natural and that associated with rainfall treatments—and changes in plant communities in analyses of AM fungal community variation improve our understanding of their responses to altered rainfall regimes.…”

Section: Discussionmentioning

confidence: 99%

“…Reduction in rainfall has been shown to result in the accumulation of sugars, sugar alcohols, proline and proteins in plants (Farooq, Wahid, Kobayashi, Fujita, & Basra, 2009), which could, in turn, affect the AM fungal community. In addition, root lifespan and turnover have been observed to be affected by changes in rainfall (Brunner et al, 2015) and AM fungal community composition and richness can vary depending on the age of the roots (Kil, Eo, Lee, & Eom, 2014; but see Donn et al, 2017). We could not account for most of these traits in this field study due to our focus on matching community and trait data at the individual plant level, which limited the amount of material that we could analyse and prevented measurements of traits linked to phenology.…”

Section: Discussionmentioning

confidence: 99%

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Experimentally altered rainfall regimes and host root traits affect grassland arbuscular mycorrhizal fungal communities

et al. 2018

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Future climate scenarios predict changes in rainfall regimes. These changes are expected to affect plants via effects on the expression of root traits associated with water and nutrient uptake. Associated microorganisms may also respond to these new precipitation regimes, either directly in response to changes in the soil environment or indirectly in response to altered root trait expression. We characterized arbuscular mycorrhizal (AM) fungal communities in an Australian grassland exposed to experimentally altered rainfall regimes. We used Illumina sequencing to assess the responses of AM fungal communities associated with four plant species sampled in different watering treatments and evaluated the extent to which shifts were associated with changes in root traits. We observed that altered rainfall regimes affected the composition but not the richness of the AM fungal communities, and we found distinctive communities in the increased rainfall treatment. We found no evidence of altered rainfall regime effects via changes in host physiology because none of the studied traits were affected by changes in rainfall. However, specific root length was observed to correlate with AM fungal richness, while concentrations of phosphorus and calcium in root tissue and the proportion of root length allocated to fine roots were correlated to community composition. Our study provides evidence that climate change and its effects on rainfall may influence AM fungal community assembly, as do plant traits related to plant nutrition and water uptake. We did not find evidence that host responses to altered rainfall drive AM fungal community assembly in this grassland ecosystem.

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Root Microbiome Structure and Microbial Succession in the Rhizosphere

Richardson

Kawasaki

Condron

et al. 2020

Rhizosphere Biology: Interactions Between Microbes and Plants

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Root type is not an important driver of mycorrhizal colonisation in Brachypodium distachyon

Cited by 13 publications

References 64 publications

Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

Experimentally altered rainfall regimes and host root traits affect grassland arbuscular mycorrhizal fungal communities

Root Microbiome Structure and Microbial Succession in the Rhizosphere

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