Symbiotic performance and induction of systemic resistance against Cercospora sojina in soybean plants co-inoculated with Bacillus sp. CHEP5 and Bradyrhizobium japonicum E109

TONELLI, M.L.; MAGALLANES NOGUEIRA, C; FABRA, A.

ARCHIVES OF MICROBIOLOGY

SPRINGER

Lugar: Berlin; Año: 2017

0302-8933

Glycine max (soybean) is an economically very important crop throughout the word and particularly in Argentina. Soybean yield may be affected by many factors such as the lack of some essential nutrients or pathogens attack. The application of chemical pesticides and fertilizers is a widely used strategy to prevent such growth losses, but their cost is high and could cause severe environmental damage. In this work we demonstrated that the co-inoculation of the native biocontrol bacterium Bacillus sp. CHEP5 which induces resistance against Cercospora sojina in soybean and the nitrogen fixing strain BradyrhizobiumjaponicumE109, was more effective in reducing frog leaf spot ( FLS) severity than the inoculation of the biocontrol agent alone. Probably, this improvement in the control of Cercospora sojina, the FLS causal agent, is related with the increase in the ability to form biofilm when both bacteria are growing together. Furthermore, Bacillus sp. CHEP5 inoculation did not affect Bradyrhizobium japonicum E109 symbiotic behavior and flavonoids composition of root exudates in pathogen challenged plants.These results suggest that co-inoculation of plants with rhizobia and biocontrol agents could be a strategy to improve soybean production in a sustainable system.