Optimization of a food industry-waste-based medium for the production of the plant growth promoting microorganism Pseudomonas oryzihabitans PGP01 based on agro-food industries by-products

• Main Authors: Daniel Cantabella, Ramon Dolcet-Sanjuan, Cristina Solsona, Laura Vilanova, Rosario Torres, Neus Teixidó
• Format: Article
• Language: English
• Published: Elsevier 2021-12-01
• Series: Biotechnology Reports
• Subjects: Plant growth-promoting microorganisms; Low-cost production; Agro-food by-products; Molasses; In vitro micropropagated plants
• Online Access: http://www.sciencedirect.com/science/article/pii/S2215017X21000916

In this study, three wastes based on potato peels and pulps, tomato seeds and wheat bran were used as basis for the preparation of a cheap medium to produce the bacterium P. oryzihabitans PGP01. In flasks experiments, P. oryzihabitans PGP01 growth at 25 °C in a medium based on frozen potato peels and pulp (FPP) with tryptone as a nitrogen source resulted in the maximum production compared to the commercial TSB medium. In the scale-up to 2 L bioreactors, FPP supplemented with tryptone, molasses, NaCl and K2HPO4 allowed to reach similar biomass production than in the TSB medium. A maximum growth of 4.4 × 109 CFU mL−1 after setting the agitation and the air flux conditions at 400 rpm and 0.75 vvm. Finally, P. oryzihabitans PGP01 growing in this optimized medium conserved its biological activity showing the expected effect in root development previously reported for this microorganism.