Aridity modulates belowground bacterial community dynamics in olive tree
KAUST DepartmentRed Sea Research Center (RSRC)
Biological and Environmental Science and Engineering (BESE) Division
Embargo End Date2022-09-07
Permanent link to this recordhttp://hdl.handle.net/10754/671101
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AbstractAridity negatively affects the diversity and abundance of edaphic microbial communities and their multiple ecosystem services, ultimately impacting vegetation productivity and biotic interactions. Investigation about how plant-associated microbial communities respond to increasing aridity is of particular importance, especially in light of the global climate change predictions. To assess the effect of aridity on plant associated bacterial communities, we investigated the diversity and co-occurrence of bacteria associated with the bulk soil and the root system of olive trees cultivated in orchards located in higher, middle and lower arid regions of Tunisia. The results indicated that the selective process mediated by the plant root system is amplified with the increment of aridity, defining distinct bacterial communities, dominated by aridity-winner and aridity-loser bacteria negatively and positively correlate with increasing annual rainfall, respectively. Aridity regulated also the co-occurrence interactions among bacteria by determining specific modules enriched with one of the two categories (aridity-winners or aridity-losers), which included bacteria with multiple PGP functions against aridity. Our findings provide new insights into the process of bacterial assembly and interactions with the host plant in response to aridity, contributing to understand how the increasing aridity predicted by climate changes may affect the resilience of the plant holobiont.
CitationMarasco, R., Fusi, M., Rolli, E., Ettoumi, B., Tambone, F., Borin, S., … Daffonchio, D. (2021). Aridity modulates belowground bacterial community dynamics in olive tree. Environmental Microbiology. doi:10.1111/1462-2920.15764
SponsorsThis research was supported by the EU project BIODESERT (European Community’s Seventh Framework Programme CSA-SA REGPOT-2008-2 under grant agreement no. 245746), King Abdullah University of Science and Technology through the baseline research funds to DD. ER and SB thank funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 841317, for the project “SENSE”.