Effect of aerosolization on subsequent bacterial survival

Area of Science:

• Plant Pathology
• Microbiology
• Environmental Science

Background:

• Aerosolization is a potential dispersal method for plant pathogenic bacteria.
• Understanding bacterial survival post-aerosolization is crucial for disease management.

Purpose of the Study:

• To investigate the impact of aerosolization on the survival of Pseudomonas syringae and Erwinia herbicola.
• To determine the influence of environmental factors (temperature, humidity) on bacterial survival after aerosolization.
• To assess bacterial establishment and survival on host plants following aerosol dispersal.

Main Methods:

• Aerosolization of P. syringae and E. herbicola in a greenhouse setting.
• Sampling aerosols using all-glass impingers at varying distances.
• Monitoring bacterial survival in impingers for 6 hours.
• Inoculating bean and oat plants directly and assessing bacterial populations over 8 days.

Main Results:

• Bacterial survival was not impaired up to 1 meter from the release site.
• P. syringae survival increased 35-65 fold under cooler (12°C) and humid (80% RH) conditions compared to warmer (27°C) and drier (40% RH) conditions.
• No significant difference in survival was observed between P. syringae and E. herbicola under identical conditions.
• Initially detectable bacterial populations on plants decreased to undetectable levels within 48 hours, regardless of inoculation method.

Conclusions:

• Aerosolization does not necessarily impair bacterial survival, particularly at short distances.
• Environmental conditions significantly influence bacterial survival post-aerosolization, with implications for disease spread.
• While bacteria can establish transient populations on plants via aerosol drift, long-term survival appears limited under tested conditions.