Pseudanabaenaceae cyanobacteria

Pseudanabaenaceae represent a family of filamentous cyanobacteria that function as aggressive pathogens in hydroponic and aquaponic farming systems. Unlike terrestrial pathogens, these organisms thrive in aqueous environments, forming dense biofilms that physically interfere with root respiration and nutrient uptake by cultivated crops.

The type of impact is categorized as biological contamination, leading to severe physiological stress in plants. These bacteria negatively affect a wide range of horticultural crops, including leafy greens, herbs, and young seedlings, particularly those grown in deep-water culture or NFT (Nutrient Film Technique) systems.

Key symptoms include the development of slimy, greenish or dark-colored deposits on the root system and inner surfaces of irrigation pipes. Signs of infection also manifest as stunted growth, systemic yellowing of foliage (chlorosis), and eventual root necrosis caused by the toxic secondary metabolites produced by the bacterial colonies.

The environmental conditions favoring the spread of Pseudanabaenaceae are excessive nutrient concentrations, particularly nitrogen and phosphorus, combined with light leakage into reservoirs. These factors facilitate rapid photosynthesis and biomass accumulation, which quickly degrades the water quality required for healthy plant development.

Control and prevention strategies include:

• Shielding nutrient reservoirs from direct sunlight to suppress photosynthesis.
• Installing ultraviolet (UV) sterilization units to treat recirculating water.
• Performing routine sanitation of irrigation lines with eco-friendly sanitizers.
• Maintaining proper dissolved oxygen levels and pH balance within the nutrient solution.