Belowground crop responses to root herbivory are associated with the community structure of native arbuscular mycorrhizal fungi

Ng, Anna; Wilson, Bree A.L.; Frew, Adam

doi:10.1016/j.apsoil.2022.104797

Cited by 11 publications

(7 citation statements)

References 76 publications

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“…The field soil inoculum was taken from the top 0–20 cm of soil from a strip of soil adjacent to an organically managed arable field. Soil from this site had previously been sampled and sequenced for prior studies, thus was known to harbour a diverse AM fungal community (Ng et al, 2023). The site was identified to harbour 63 virtual taxa (VT) of AM fungi (Frew, 2022) 1 month prior to sampling to make the inoculum.…”

Section: Methodsmentioning

confidence: 99%

Host filtering, not competitive exclusion, may be the main driver of arbuscular mycorrhizal fungal community assembly under high phosphorus

2023

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A major goal in ecology is understanding the factors which determine the diversity and distribution of organisms. The outcome of the symbiotic relationship between plants and arbuscular mycorrhizal (AM) fungi is strongly influenced by soil phosphorus (P) availability. Despite this knowledge, there is still much to uncover about how soil P status can shape the taxonomic and phylogenetic assembly of root‐colonising AM fungi. Additionally, there is a paucity of understanding about the implications of these changes for the outcome of the AM symbiosis in terms of plant growth, nutrient status and defence traits. We conducted a factorial pot experiment where sorghum (Sorghum bicolor) was grown under three different P treatments (low, medium and high), in the presence or absence of a natural AM fungal community. By analysing the diversity and community structure of the fungal community colonising roots, we aimed to determine if and how soil P influences the relatedness of these communities and whether competitive exclusion or environmental filtering play a more significant role in their assembly. Additionally, we evaluated the concomitant outcomes for plant growth, nutrient acquisition and defensive chemistry (phenolics). Increasing P availability reduced AM fungal richness and increased community evenness. Root‐colonising AM fungal communities under the high P treatment had significantly reduced phylogenetic diversity and comparatively lower mean pairwise distances among all treatments. This indicated that AM fungal communities became more closely related (phylogenetically clustered) with increasing soil P. The mycorrhizal growth and mycorrhizal P responses of plants were positive under low and medium P, but this was lost under high P, however, plant phenolics were increased. Our results suggest that under high P conditions, environmental filtering plays an important role in AM fungal community assembly as host plants alter their selectivity of fungal functional groups prioritising those associated with enhancing plant stress resistance and defences, rather than nutrient acquisition. Here we demonstrated how soil P status can shape taxonomic and phylogenetic assembly of AM fungi and the associated functional outcomes for the host. Read the free Plain Language Summary for this article on the Journal blog.

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Section: Methodsmentioning

confidence: 99%

Host filtering, not competitive exclusion, may be the main driver of arbuscular mycorrhizal fungal community assembly under high phosphorus

2023

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“…Plants to be grown with AM fungi were inoculated with 150 g of sieved and dried field soil inoculum which was taken from arable field in Queensland, Australia (−27.432°, 152.349°) known to harbour a diverse AM fungal community (Ng et al, 2023). Plants without AM fungi were inoculated with the same inoculum, autoclaved.…”

Section: Methodsmentioning

confidence: 99%

Water availability alters the community structure of arbuscular mycorrhizal fungi and determines plant mycorrhizal benefit

Frew

2023

Plants People Planet

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Societal Impact StatementThe world faces major changes in rainfall patterns and water availability, posing a significant threat to plant productions systems and food security. The arbuscular mycorrhizal (AM) fungi associate with most major crops and can support plant nutrient and water uptake. Here, AM fungi were shown to mitigate the negative effects of low water availability on sorghum growth and phosphorus uptake, an effect that was associated with shifts in the fungal community structure. To realise the potential of AM fungi in sustainable agriculture requires more examination of their interactions with edaphic stresses in crop systems.

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“…Plants in the 'with AM fungi' treatment were inoculated by potting with 150 g of sieved, air-dried field soil inoculum combined with the sterile sand/soil mixture. One week before initiation of the experiment, the inoculum was sourced from the top 20 cm of soil alongside an organically managed arable field in southern Queensland, Australia (À27.4326°, 152.3495°), a site previously verified to harbour a diverse AM fungal community (Ng et al, 2023). Conversely, the 'no AM fungi' treatment used 150 g of autoclaved field soil inoculum.…”

Section: Methodsmentioning

confidence: 99%

Herbivory‐driven shifts in arbuscular mycorrhizal fungal community assembly: increased fungal competition and plant phosphorus benefits

Frew,

Öpik,

Oja

et al. 2023

New Phytologist

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Belowground crop responses to root herbivory are associated with the community structure of native arbuscular mycorrhizal fungi

Cited by 11 publications

References 76 publications

Host filtering, not competitive exclusion, may be the main driver of arbuscular mycorrhizal fungal community assembly under high phosphorus

Host filtering, not competitive exclusion, may be the main driver of arbuscular mycorrhizal fungal community assembly under high phosphorus

Water availability alters the community structure of arbuscular mycorrhizal fungi and determines plant mycorrhizal benefit

Herbivory‐driven shifts in arbuscular mycorrhizal fungal community assembly: increased fungal competition and plant phosphorus benefits

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