Data from: Carbon resource richness shapes bacterial competitive interactions by alleviating growth-antibiosis trade-off

Antibiosis and resource competition are major drivers shaping the
assembly, diversity and functioning of microbial communities. While it is
recognised that competition is sensitive to environmental conditions, it
is unclear to what extent this mediated by the availability of different
carbon resources. Here we used a model laboratory system to directly test
this by exploring how carbon resource richness and identity shape resource
competition and antibiosis between plant probiotic Bacillus
amyloliquefaciens and phytopathogenic Ralstonia solanacearum bacteria. We
found that while sugars typically promoted B. amyloliquefaciens growth,
organic and amino acids increased the production of both bacillaene and
macrolactin antibiotics and the direct inhibition of R. solanacearum. In
contrast, when multiple different carbon resources were available, B.
amyloliquefaciens could efficiently grow and produce antibiotics at the
same time. Together, these results suggest that high carbon resource
richness allows concurrent expression of growth- and antibiosis-related
traits, potentially altering bacterial competitive dynamics and plant
growth promotion in microbial communities.