| dc.description.abstract | Introduction: The existence of a core microbiota specific to a plant species,
or the set of microorganisms shared by all plant individuals of the species, is of
utmost importance because of its many conceptual and practical consequences.
The core microbiota is assumed to gather the most ecologically and functionally
relevant microorganisms associated to a plant in a given environment,
presumably establishing positive feedbacks that support its persistence and
performance in a plant community.
Methods: We tested the existence of a potential core microbiota in Maytenus
senegalensis shrubs in two contrasted, distant ecosystems; a dry environment
(Almeria, Spain) and a relatively wetter ecosystem (Dakar, Senegal).
Results: Soil microbial community structure widely differed between sites
influenced by soil and climate. However, a subset of microbial phylotypes
appeared consistently associated to all M. senegalensis plants across our two
disparate ecosystems while they were absent in the surrounding soil, suggesting
the presence of a core microbiota in M. senegalensis.
Discussion: Microbiota had an effect on germination that differed between sites,
perhaps due to climatic constrains. We show that the assembly of understory
microbial communities depends on the plant’s sorting effect on the surrounding
soil microbiota, plus some other taxa likely transferred by seeds; this assembly
mechanism is relevant for the coevolution of plants and microorganisms, and
critical for potential community responses to environmental changes. | en_US |
