Endophytic Bacillus subtilis strain E1R-J is a promising biocontrol agent for wheat powdery mildew

BioMed Research International
Xiaoning GaoLili Huang

Abstract

In this study, the biocontrol efficacies of 14 endophytic bacterial strains were tested against Blumeria graminis f. sp. tritici (Bgt) in pot experiments under greenhouse conditions. Bacillus subtilis strain E1R-j significantly reduced disease index and exhibited the best control (90.97%). When different formulations of E1R-j were sprayed 24 h before Bgt inoculation, fermentation liquid without bacterial cell and crude protein suspension displayed the similar effects; and they reduced disease index more than bacterial cell suspension (10(9) cfu mL(-1)) and fermentation liquid without protein. The control effects were not significantly different between 10(11) and 10(9) cfu mL(-1) of bacterial cell suspension but were higher than 10(7) cfu mL(-1). Further observations showed that conidial germination and appressorial formation of Bgt were retarded by spraying E1R-j 24 h before Bgt inoculation. Compared with the water check, conidial germination and appressorial formation were decreased by 43.3% and 42.7%, respectively. In the treatment with E1R-j, the number of houstoria significantly reduced and the speed of mycelial extension was slowed down in the wheat leaves. Scanning electron microscopy observation revealed that E1R-j sign...Continue Reading

References

Feb 1, 1993·The Journal of Applied Bacteriology·P J Fiddaman, S Rossall
Nov 10, 2001·Annual Review of Phytopathology·T C Paulitz, R R Bélanger
Jul 31, 2002·Annual Review of Phytopathology·Bruce A McDonald, Celeste Linde
Sep 19, 2003·Applied Microbiology and Biotechnology·D RomeroA de Vicente

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