Sorochytriaceae

Sorochytriaceae is a family of endoparasitic microorganisms belonging to the Chytridiomycota phylum. In agronomy, they are recognized as specific pathogens that infect aquatic and semi-aquatic plants, as well as certain agricultural crops grown under conditions of excessive soil moisture or waterlogging.

The causative agent of the disease is an obligate parasite. Its life cycle involves the production of flagellated zoospores that move actively through the water film, allowing them to locate and penetrate host cells efficiently. Once inside the plant tissue, the pathogen develops sporangia where new reproductive units mature, facilitating the rapid spread of the infection throughout the crop.

Symptoms of the disease typically appear as localized necrosis, tissue deformation, or the formation of specific galls on roots and stems. In the areas of infection, chlorosis is often observed, leading to stunted overall plant growth and the eventual necrosis of vegetative organs due to the disruption of nutrient and water transport systems.

The development of the disease is strictly dependent on soil moisture regimes. The optimal conditions for zoospore germination and infection are high soil moisture, standing water in fields, or prolonged periods of precipitation during moderate temperatures. The pathogen is disseminated through contaminated soil, irrigation water, and infected crop residues, where it persists in the form of resting spores.

Protection strategies include an integrated approach: establishing efficient drainage systems to prevent waterlogging, maintaining strict crop rotation practices, and removing crop residues. While fungicides may be used in cases of severe outbreaks, the most effective preventative measures involve optimizing agrotechnical conditions, such as improving soil aeration and monitoring pH levels to make the environment unfavorable for zoospore mobility and survival.