Castaldi, Stefany (2022) Biology and application of industrial microorganisms. [Tesi di dottorato]

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The possibility to improve agricultural crop yield by the beneficial bacteria inoculation has been an emerging area for the last decade. In a historic moment in which the increasing population coupled with land degradation aggravates challenges of crop production, the potential of the use of soil microorganisms to ensure agricultural productivity has a huge global impact on our society. In this context, Plant Growth-Promoting (PGP) bacteria are receiving increasing attention as biofertilizers able to sustain the fertility of soils and replace agrochemical compounds with negative impacts on the environment. Moreover, these beneficial bacteria represent the cheaper and easily available strategy for the mitigation of different biotic and abiotic stresses, reducing the phytopathogens infection, or alleviating environmental stresses respectively. Consequently, PGPBs or their metabolites are exhibiting a gradual increase in demand on the world market as sustainable and eco-friendly tools. In this Ph.D. thesis, the biotechnological potential of secondary metabolites secreted by bacteria and fungi as new natural fungicides is reported (Chapter II-V). Moreover, the isolation and characterization of new plant growth-promoting bacteria, able to improve the plant growth under different stress conditions and with biocontrol activities, are also presented herein (Chapter VI-IX).

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