The microbiome as a biosensor: functional profiles elucidate hidden stress in hosts

Area of Science:

• Environmental microbiology
• Plant science
• Systems biology

Background:

• Microbial communities respond to environmental changes.
• Host-associated microbes may serve as in situ sensors.
• Plant-soil systems are sensitive to water quality.

Purpose of the Study:

• To test the hypothesis that host-associated microbes can act as in situ sensors.
• To investigate microbial responses to environmental stress in plants.
• To compare microbial and host transcriptional responses to stress.

Main Methods:

• Used a plant-soil model system with two plant species.
• Irrigated plants with low-quality water to induce stress.
• Analyzed microbial DNA (metagenomics) and RNA (transcriptomics) from roots.
• Performed host plant transcriptional profiling.

Main Results:

• Host plants showed general stress-related gene expression.
• Microbial communities revealed specific stress signals (high salt, pH, low oxygen).
• Microbial gene expression confirmed active response to environmental conditions.

Conclusions:

• Microbial profiling can detect environmental stress signals not evident in host gene expression.
• Microbial communities can serve as sensitive microsensors for in situ environmental monitoring.
• This approach has broad potential for various host systems.