Phytophthora Root Rot Modifies the Composition of the Avocado Rhizosphere Microbiome and Increases the Abundance of Opportunistic Fungal Pathogens

The structure and function of rhizosphere microbial communities are affected by the plant health status. In this study, we investigated the effect of root rot on the avocado rhizosphere microbiome, using 16S rDNA and ITS sequencing. Furthermore, we isolated potential fungal pathogens associated with...

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Bibliographic Details
Published in:Frontiers in microbiology 2021-01, Vol.11, p.574110-574110
Main Authors: Solís-García, Itzel A, Ceballos-Luna, Oscar, Cortazar-Murillo, Elvis Marian, Desgarennes, Damaris, Garay-Serrano, Edith, Patiño-Conde, Violeta, Guevara-Avendaño, Edgar, Méndez-Bravo, Alfonso, Reverchon, Frédérique
Format: Article
Language:English
Subjects:
Fusarium
Microbiology
Mortierella
Persea americana
rhizosphere microbial communities
root necrotizing fungi
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Summary:The structure and function of rhizosphere microbial communities are affected by the plant health status. In this study, we investigated the effect of root rot on the avocado rhizosphere microbiome, using 16S rDNA and ITS sequencing. Furthermore, we isolated potential fungal pathogens associated with root rot symptoms and assessed their pathogenic activity on avocado. We found that root rot did not affect species richness, diversity or community structure, but induced changes in the relative abundance of several microbial taxa. Root rot increased the proportion of Pseudomonadales and Burkholderiales in the rhizosphere but reduced that of Actinobacteria, spp. and Rhizobiales. An increase in putative opportunistic fungal pathogens was also detected in the roots of symptomatic trees; the potential pathogenicity of sp., spp., sp. and sp., is reported for the first time for the State of Veracruz, Mexico. Root rot also potentially modified the predicted functions carried out by rhizobacteria, reducing the proportion of categories linked with the lipid and amino-acid metabolisms whilst promoting those associated with quorum sensing, virulence, and antibiotic resistance. Altogether, our results could help identifying microbial taxa associated to the disease causal agents and direct the selection of plant growth-promoting bacteria for the development of biocontrol microbial consortia.
ISSN:1664-302X
1664-302X
DOI:10.3389/fmicb.2020.574110