microbial-signaling
Microbial signaling refers to the chemical communication that occurs between microorganisms and plants, including the exchange of hormones, volatile compounds, and molecular signals that modulate plant growth, immunity, and stress responses. Understanding these interactions is critical for plant science because the rhizosphere microbiome profoundly influences plant health, nutrient uptake, and resilience to pathogens and environmental stressors. Research in this area is revealing how plants recruit and respond to beneficial microbes, opening new avenues for sustainable agriculture and plant protection strategies.
PubMed · 2026-04-06
Scientists discovered that soil bacteria called Streptomyces communicate and compete using iron-grabbing molecules called siderophores, triggering complex chain reactions that alter how neighboring bacteria grow and behave. This work reveals that microbial relationships in soil are far more nuanced than previously thought.
Only one of the four Streptomyces strains (strain C) naturally produced desferrioxamine B (DFO-B), an iron-scavenging molecule, even though all four strains carry the genetic blueprint to make it.
Adding DFO-B or iron directly to cultures mimicked the growth boost seen when strain A was grown alongside strain C, and disabling DFO-B production via CRISPR gene editing eliminated this effect.
Strain A activated entirely different sets of genes and metabolic pathways depending on which neighbor it was grown with, proving that bacterial responses in soil are highly partner-specific rather than generic.