Biocontrol and Osmoprotection for Plants under Salinated Conditions

Crop cultivation in salinated soils is one of the major challenges in agriculture: salinated areas are increasing worldwide and plants growing under saline or water-imbalance stress are more vulnerable to diseases caused by soil-borne pathogens. Biocontrol using salt-tolerant, plant-growth-promoting rhizobacteria (PGPR) to protect plant roots against high salinity as well as pathogens offers sustainable solutions for plant protection. Screening strategies for specific PGPRs are presented and assessed. Stenotrophomonas rhizophila is a model for a rhizosphere- and phylloplane-competent, salt-tolerant PGPR. The most effective strain S. rhizophila DSM 14405T showed biocontrol activity on various crops under salinated conditions in greenhouse and field trials in Uzbekistan. Besides, the strain DSM 14405T does not only show rhizosphere competence and antagonistic activity but also produces high amounts of osmoprotective substances allowing it to survive under saline conditions. New insights into its mode of action are presented from genomic information.

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