The bacterium Pseudomonas sp. DSMZ 13134 was isolated on lettuce’s roots for the first time at the beginning of the 21st Century in Sourcon Padena labs, during a research aimed to find new biological solutions to control Phytium ultimum.
Non-Genetically Modified and naturally occurring in the environment, this bacterium is a PGPR – Plant Growth Promoting Rhizobacteria, microorganisms stimulating roots’ and plants’ growth. Roots are the best environment to grow for Pseudomonas sp. DSMZ 13134, and where it finds its place after application.
Different Mode of Actions foster protection and bio-stimulation of the plants:
- SPACE COMPETITION: Pseudomonas sp. DSMZ 13134 colonizes rhizosphere quicker than pathogens, creating a biofilm in where availability of nutrients and space to access roots’ mucigel is limited.
- NUTRIENT COMPETITION: Pseudomonas sp. DSMZ 13134 produces organic and siderophore acids (Pseudomonine and Quinolobactine), highly effective in chelating metal cations (zinc, copper and iron), then less available for pathogens. Iron is essential to start infective processes.
- Pseudomonas sp. DSMZ 13134 produces non-exogenous Chitinase able to degrade pathogens’ cellular walls.
- SYSTEMIC AQUIRED RESISTANCE (SAR). SAR is correlated to the production of Salycilic Acid, a phytohormone that induces the production of PR-proteins (Pathogen Related proteins), among which Chitinase, peroxidase, lysozyme and deposition of lignin. INDUCED SYSTEMIC RESISTANCE (ISR). Pseudomonas sp. DSMZ 13134 is able to induce ISR raising the speed of reaction of specific defenses against pathogens and abiotic stresses. ISR is transmitted through Jasmonic acid and ethylene.
- Pseudomonas sp. DSMZ 13134 fosters roots’ growth through hormonal-like substances, as Auxine, Citochinine and ethylene. These do not have a direct effect against pathogens, however stimulating the roots the plant is more resistant against abiotic stresses and pathogens.
