Successional changes in bacterial phyllosphere communities are plant-host species dependent

Area of Science:

• Microbial Ecology
• Plant-Microbe Interactions
• Environmental Microbiology

Background:

• Phyllosphere microbial communities are vital for plant health and ecosystem productivity.
• Drought is a significant pulse disturbance impacting these communities, with unknown recovery dynamics.
• Understanding microbial community stability under stress is crucial for predicting agricultural and ecosystem responses to climate change.

Purpose of the Study:

• To investigate the stability, response, and recovery of phyllosphere microbial communities subjected to drought stress.
• To determine if functional and compositional changes during drought are reversible.
• To explore the role of host plant species in mediating community responses to drought.

Main Methods:

• Simulated drought stress and subsequent recovery periods were applied to temperate forage grasses.
• Phyllosphere microbial community composition and function were analyzed over time.
• Ecological modeling was used to understand community assembly processes and disturbance impacts.

Main Results:

• Drought significantly altered phyllosphere community composition, with incomplete recovery after irrigation resumed.
• The degree of compositional shift was dependent on the host plant species.
• Despite compositional changes, high functional stability (resistance) was observed during drought and recovery.

Conclusions:

• Phyllosphere communities exhibit host-specific responses to drought, with altered succession patterns.
• Drought induces variable selection, leading to community divergence unique to each host species.
• While compositionally altered, the functional stability of phyllosphere microbiomes suggests resilience, but full recovery is not guaranteed.