Managing fungal diseases of tomato and wheat by potential biocontrol agents in salinated soils of Uzbekistan

摘要

Up to 30% of crop plants are lost before harvesting in Uzbekistan, mainly due to fungal diseases caused by pathogenic fungi. The ecological balance in naturally suppressive soils favourable to crop plants is now considered to be a concerted action ofseveral microorganisms, with their own mode of action against pathogens, often in conjunction with the host plant (Lemanceau & Alabouwette, 1993). A variety of rhizobacteria with biological control activities has been described, and these bacteria use diverse mechanisms to protect crops (Lugtenberg et al., 2002). Potential biocontrol agents include Pseudomonas and Bacillus (Weller, 1988). Although numerous commercial biocontrol strains are already being marketed, there is much interest in the development of new biocontrol agents, to extent the area of application and to target pathogens. In the present work we screened and developed salt-tolerant biological control organisms against tomato foot and root rot and wheat root disease in salinated, extremeconditions of Uzbekistan.