Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2007
Publication Date: 7/28/2007
Citation: Bacon, C.W., Hinton, D.M., Glenn, A.E., Macias, F.A., Marin, D. 2007. Bacillus mojavensis Intensified the Accumulation of Fungitoxic APO in the Presence of Fusarium verticillioides. Phytopathology. 97:S6. Interpretive Summary: Abstract - no summary required.
Technical Abstract: The benzoxazolinones, specifically benzoxazolin-2(3H)-one (BOA), are important transformation products of cyclic hydroxamic acids that can serve as allelochemicals providing resistance to maize from pathogenic bacteria, fungi, and insects. However, maize pathogens such as Fusarium verticillioides are capable of detoxifying the BOA to 2-aminophenol (AP), producing less toxic N-(2-hydroxyphenyl) malonamic acid (HPMA) and 2-acetamidophenol (HPAA). Since biocontrol strategies utilizing a species of endophytic bacterium, Bacillus mojavensis, are considered efficacious as a control of this Fusarium species, the in vitro transformation and effects of BOA on growth of this bacterium is examined relative to its interaction with strains of F. verticillioides. The results showed that large quantities of APO were produced on BOA amended media when F. verticillioides was cultured in the presence of B. mojavensis. APO is highly toxic to this maize pathogen and is very stable in the soil. The results indicate that the bacterium interacts with the fungus preventing it from the usual transformation of AP to the non-toxic HPMA, resulting in the accumulation of APO, which is very toxic to F. verticillioides and other organisms. Thus, an enhanced biocontrol is suggested by this in vitro study.