Deterministic abiotic filtering and halophilic core microbiomes shape bacterial community assembly in coastal salt flats (sabkha) of southern Morocco.
Amechatte G, Radouane N, El Mouttaqi A, Licastro D, Hirich A
Soil Health
Salt-tolerant plants clinging to life in coastal flats recruit specific bacteria that help them survive conditions that would kill most garden plants — and those same microbes could one day be harnessed to help crops endure salty, degraded soils.
Scientists looked at the tiny bacteria living in the soil, roots, and leaves of plants that thrive in extremely salty coastal flats in Morocco. They found that the saltier and more alkaline the environment, the fewer types of bacteria were present — but the ones that stuck around were specialists built for those harsh conditions. Remarkably, across different plant species and locations, the same small group of salt-loving bacteria kept showing up, suggesting plants actively recruit a reliable microbial team to survive extreme stress.
Key Findings
Bacterial diversity dropped consistently from bulk soil to rhizosphere to roots to shoots, showing a progressive filtering effect as proximity to the plant increased.
Electrical conductivity, sodium, potassium, and carbonate levels were the primary environmental factors structuring which bacteria were present across three sabkha sites.
Despite differences in site and plant species, a stable 'halophilic core microbiome' of salt-tolerant bacteria converged across all sampled halophytes.
chevron_right Technical Summary
Researchers studying salt flat plants in southern Morocco found that extreme salt and alkalinity — not random chance — determine which bacteria live on and around halophytes. Despite harsh differences across sites, the plants consistently hosted a shared core set of salt-tolerant bacteria.
Abstract Preview
Coastal salt flats, locally known as sabkhas, are hypersaline, alkaline desert ecosystems that impose extreme abiotic stress on microbial and plant life. Despite their ecological significance, plan...
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