Propionibacteriaceae

The family Propionibacteriaceae is widely recognized for its industrial applications, yet certain strains act as significant plant pathogens. These bacteria are responsible for specific types of soft rot and tissue necrosis in agricultural crops. As phytopathogens, they exploit weaknesses in plant immunity caused by environmental stress or physical injuries, leading to the rapid degradation of plant tissues.

A wide range of horticultural and vegetable crops are susceptible to these bacteria, particularly root vegetables such as potatoes, beets, and carrots. The infection often initiates at the site of harvest damage or wounds caused by soil pests. Once the protective barrier of the plant is compromised, the bacteria rapidly colonize the internal tissues, utilizing nutrients for their metabolic growth.

Symptoms of the infection include localized areas of tissue softening, discoloration ranging from yellow to dark brown, and a distinct foul odor resulting from cell wall disintegration. In advanced stages, the structural integrity of the plant is completely lost, turning the affected parts into a mushy, water-soaked mass that can ruin entire batches of stored crops.

Development and spread are primarily driven by adverse environmental factors, such as waterlogging, high humidity levels, and soil compaction. These conditions reduce oxygen availability, favoring the proliferation of anaerobic or microaerophilic populations within the Propionibacteriaceae group. Furthermore, suboptimal storage temperatures significantly accelerate the rate of rot progression in post-harvest conditions.

Preventive measures and crop protection strategies are essential for minimizing economic damage. Growers should prioritize soil health by improving drainage and avoiding excessive nitrogen application. Integrated pest management (IPM) is critical to reduce mechanical damage, which serves as an entry point for bacteria. Additionally, ensuring proper drying and storage conditions helps limit the spread of potential pathogens after harvest.