Substrate complexity buffers negative interactions in a synthetic community of leaf litter degraders.
Détails
ID Serval
serval:BIB_56873C7A59CB
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Substrate complexity buffers negative interactions in a synthetic community of leaf litter degraders.
Périodique
FEMS microbiology ecology
ISSN
1574-6941 (Electronic)
ISSN-L
0168-6496
Statut éditorial
Publié
Date de publication
12/07/2024
Peer-reviewed
Oui
Volume
100
Numéro
8
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Publication Status: ppublish
Résumé
Leaf litter microbes collectively degrade plant polysaccharides, influencing land-atmosphere carbon exchange. An open question is how substrate complexity-defined as the structure of the saccharide and the amount of external processing by extracellular enzymes-influences species interactions. We tested the hypothesis that monosaccharides (i.e. xylose) promote negative interactions through resource competition, and polysaccharides (i.e. xylan) promote neutral or positive interactions through resource partitioning or synergism among extracellular enzymes. We assembled a three-species community of leaf litter-degrading bacteria isolated from a grassland site in Southern California. In the polysaccharide xylan, pairs of species stably coexisted and grew equally in coculture and in monoculture. Conversely, in the monosaccharide xylose, competitive exclusion and negative interactions prevailed. These pairwise dynamics remained consistent in a three-species community: all three species coexisted in xylan, while only two species coexisted in xylose, with one species capable of using peptone. A mathematical model showed that in xylose these dynamics could be explained by resource competition. Instead, the model could not predict the coexistence patterns in xylan, suggesting other interactions exist during biopolymer degradation. Overall, our study shows that substrate complexity influences species interactions and patterns of coexistence in a synthetic microbial community of leaf litter degraders.
Mots-clé
Plant Leaves/metabolism, Plant Leaves/microbiology, Bacteria/metabolism, Ecosystem, Species Specificity, Xylans/metabolism, Xylose/metabolism, Models, Theoretical, Actinobacteria/growth & development, Actinobacteria/metabolism, Bacteroidetes/growth & development, Bacteroidetes/metabolism, Proteobacteria/growth & development, Proteobacteria/metabolism, Microbial Interactions/physiology, Poaceae/microbiology, Curtobacterium, biopolymer degradation, bottom-up approach, extracellular enzymes, interspecific interactions, leaf litter microbiome
Pubmed
Web of science
Open Access
Oui
Création de la notice
19/07/2024 14:57
Dernière modification de la notice
13/08/2024 7:48