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Metabarcoding and Metabolomics Reveal the Effect of the Invasive Alien Tree IMiconia calvescens/I DC. on Soil Diversity on the Tropical Island of Mo’orea
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Metabarcoding and Metabolomics Reveal the Effect of the Invasive Alien Tree IMiconia calvescens/I DC. on Soil Diversity on the Tropical Island of Mo’orea
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Journal Article
Metabarcoding and Metabolomics Reveal the Effect of the Invasive Alien Tree IMiconia calvescens/I DC. on Soil Diversity on the Tropical Island of Mo’orea
2023
Overview
Miconia calvescens is a dominant invasive alien tree species that threatens several endemic plants in French Polynesia (South Pacific). While most analyses have been performed at the scale of plant communities, the effects on the rhizosphere have not been described so far. However, this compartment can be involved in plant fitness through inhibitory activities, nutritive exchanges, and communication with other organisms. In particular, it was not known whether M. calvescens forms specific associations with soil organisms or has a specific chemical composition of secondary metabolites. To tackle these issues, the rhizosphere of six plant species was sampled on the tropical island of Mo’orea in French Polynesia at both the seedling and tree stages. The diversity of soil organisms (bacteria, microeukaryotes, and metazoa) and of secondary metabolites was studied using high-throughput technologies (metabarcoding and metabolomics, respectively). We found that trees had higher effects on soil diversity than seedlings. Moreover, M. calvescens showed a specific association with microeukaryotes of the Cryptomycota family at the tree stage. This family was positively correlated with the terpenoids found in the soil. Many terpenoids were also found within the roots of M. calvescens, suggesting that these molecules were probably produced by the plant and favored the presence of Cryptomycota. Both terpenoids and Cryptomycota were thus specific chemicals and biomarkers of M. calvescens. Additional studies must be performed in the future to better understand if they contribute to the success of this invasive tree.
Publisher
MDPI AG
Subject
