Shifting microbial communities can enhance tree tolerance to changing climates

Area of Science:

• Ecology
• Environmental Science
• Microbiology

Background:

• Climate change poses extinction risks to plant species by exceeding their evolved environmental tolerances.
• Plants rely on symbiotic microbial communities to influence their traits and adaptability.
• Microbial associations may offer a novel pathway for plants to gain climate resilience.

Purpose of the Study:

• To investigate if microbial communities can confer climate tolerance to tree seedlings.
• To determine the effects of microbial inoculation from different climate-sourced communities on seedling survival under stress.

Main Methods:

• Tree seedlings were inoculated with microbial communities from diverse climatic origins.
• Seedling survival rates were assessed under simulated drought, heat, and cold stress conditions.
• Microbial community composition, particularly arbuscular mycorrhizal fungi, was analyzed in relation to stress tolerance.

Main Results:

• Seedlings inoculated with microbes from drier, warmer, or colder sites showed enhanced survival under respective drought, heat, or cold stress.
• Drought tolerance was linked to increased arbuscular mycorrhizal fungi diversity.
• Cold tolerance correlated with reduced fungal richness, suggesting a benefit from excluding non-adapted microbes.

Conclusions:

• Microbial communities play a crucial role in mediating plant tolerance to climate change.
• Harnessing climate-sourced microbial inoculants can enhance forest ecosystem adaptability.
• Understanding these microbially-mediated effects is vital for predicting and managing forests under climate change.