Aboveground herbivory suppresses the arbuscular mycorrhizal symbiosis, reducing plant phosphorus uptake

Article

Frew, Adam. 2021. "Aboveground herbivory suppresses the arbuscular mycorrhizal symbiosis, reducing plant phosphorus uptake." Applied Soil Ecology. 168. https://doi.org/10.1016/j.apsoil.2021.104133
Article Title

Aboveground herbivory suppresses the arbuscular mycorrhizal symbiosis, reducing plant phosphorus uptake

ERA Journal ID5246
Article CategoryArticle
Authors
AuthorFrew, Adam
Journal TitleApplied Soil Ecology
Journal Citation168
Article Number104133
Number of Pages5
Year2021
PublisherElsevier
Place of PublicationNetherlands
ISSN0929-1393
1873-0272
Digital Object Identifier (DOI)https://doi.org/10.1016/j.apsoil.2021.104133
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0929139321002560
Abstract

Most terrestrial plants form associations with arbuscular mycorrhizal (AM) fungi, which are soil-dwelling microbial symbionts that provide plants with soil nutrients, while plants supply the fungi with carbon. The majority of these plants are also subject to herbivory from insects, thus tripartite interactions between insect herbivores, plants, and AM fungi are ubiquitous. This study assessed how aboveground herbivory from a generalist insect herbivore (Helicoverpa punctigera) affects the AM symbiosis in two C4 grass species (Bothriochloa macra and Dichanthium sericeum) and the consequences for host plant growth and nutrient uptake. Aboveground herbivory reduced root growth and carbon allocation belowground in both plant species, along with an associated reduction in arbuscular colonisation and phosphorus uptake. These findings suggest that, in accordance with the carbon-limitation hypothesis, herbivory can suppress the AM symbiosis by decreasing carbon belowground, potentially hindering AM fungal-enhanced nutrient acquisition from the soil.

KeywordsArbuscular mycorrhizal fungi; carbon-limitation hypothesis; herbivory; phosphorus; symbiosis
ANZSRC Field of Research 2020310302. Community ecology (excl. invasive species ecology)
310308. Terrestrial ecology
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Byline AffiliationsCentre for Crop Health
Institution of OriginUniversity of Southern Queensland
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