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Abstract:

The antifungal effect of Bacillus subtilis subsp. subtilis PGPMori7 and Bacillus amyloliquefaciens PGPBacCA1 was evaluated against Macrophomina phaseolina (Tassi) Goid. Cell suspension (CS), cell-free supernatant (CFS) and the lipopeptide fraction (LF) of PGPMori7 and PGPBacCA1 were screened against three different M. phaseolina strains. CS exhibited the highest inhibitory effect (around 50%) when compared to those of CFS and LF, regardless of the fungal strain studied. The synthesis of lipopeptides was studied by UV-MALDI TOF. Chemical analysis of Bacillus metabolite synthesis revealed that surfactin and iturin were mainly produced in liquid medium. Potential fengycin was also co-produced when both Bacillus were cultivated in solid medium. In co-culture assays, the bacterial colony-fungal mycelium interface at the inhibition zone was evaluated by both scanning electron microscopy (SEM) and UV-MALDI TOF, the former to determine the structural changes on M. phaseolina cells and the latter to identify the main bioactive molecules involved in the inhibitory effect. PGPBacCA1 produced surfactin, iturin and fengycin in the inhibition zone while PGPMori7 only produced these metabolites within its colony and not in the narrow inhibition zone. Interestingly, SEM revealed that PGPBacCA1 induced damage in M. phaseolina sclerotia, generating a fungicidal effect as no growth was observed when normal growth conditions were reestablished. In turn, PGPMori7 inhibited the growth of the Macrophomina mycelium without fungal injury, resulting only in a fungistatic activity. From these results, it was determined that the two bacilli significantly inhibited the growth of an important phytopathogenic fungus by at least two different mechanisms: lipopeptide synthesis and competition among microorganisms. © 2015 Elsevier GmbH.

Registro:

Documento: Artículo
Título:Antagonistic effects of Bacillus subtilis subsp. subtilis and B. amyloliquefaciens against Macrophomina phaseolina: SEM study of fungal changes and UV-MALDI-TOF MS analysis of their bioactive compounds
Autor:Torres, M.J.; Brandan, C.P.; Petroselli, G.; Erra-Balsells, R.; Audisio, M.C.
Filiación:Instituto de Investigaciones para la Industria Química (INIQUI), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Salta, Av. Bolivia 5150, Salta, 4400, Argentina
Instituto Nacional de Tecnología Agropecuaria-Estación Experimental Salta, Ruta Nacional 68 Km 172, Cerrillos, Salta, 4403, Argentina
CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 Ciudad Universitaria, Buenos Aires, 1428, Argentina
Palabras clave:B. amyloliquefaciens; Bacillus subtilis subsp. subtilis; Lipopeptides; Macrophomina phaseolina; SEM; UV-MALDI TOF MS; Bacteriology; Cell culture; Chemical analysis; Inductively coupled plasma; Metabolites; Scanning electron microscopy; Synthesis (chemical); B. amyloliquefaciens; Lipopeptides; Macrophomina phaseolina; MALDI TOF MS; Subtilis; Fungi; antagonism; bacterium; fungus; inhibition; lipid; metabolite; microbial activity; pathogen; peptide; scanning electron microscopy; Bacilli (class); Bacillus (bacterium); Bacillus amyloliquefaciens; Bacillus subtilis subsp. subtilis; Bacteria (microorganisms); Fungi; Macrophomina; Macrophomina phaseolina; antifungal agent; Ascomycetes; Bacillus; Bacillus subtilis; chemistry; drug effects; growth, development and aging; matrix-assisted laser desorption-ionization mass spectrometry; metabolism; mycelium; scanning electron microscopy; ultrastructure; Antifungal Agents; Ascomycota; Bacillus; Bacillus subtilis; Microscopy, Electron, Scanning; Mycelium; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
Año:2016
Volumen:182
Página de inicio:31
Página de fin:39
DOI: http://dx.doi.org/10.1016/j.micres.2015.09.005
Título revista:Microbiological Research
Título revista abreviado:Microbiol Res.
ISSN:09445013
CODEN:MCRSE
CAS:Antifungal Agents
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09445013_v182_n_p31_Torres

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Citas:

---------- APA ----------
Torres, M.J., Brandan, C.P., Petroselli, G., Erra-Balsells, R. & Audisio, M.C. (2016) . Antagonistic effects of Bacillus subtilis subsp. subtilis and B. amyloliquefaciens against Macrophomina phaseolina: SEM study of fungal changes and UV-MALDI-TOF MS analysis of their bioactive compounds. Microbiological Research, 182, 31-39.
http://dx.doi.org/10.1016/j.micres.2015.09.005
---------- CHICAGO ----------
Torres, M.J., Brandan, C.P., Petroselli, G., Erra-Balsells, R., Audisio, M.C. "Antagonistic effects of Bacillus subtilis subsp. subtilis and B. amyloliquefaciens against Macrophomina phaseolina: SEM study of fungal changes and UV-MALDI-TOF MS analysis of their bioactive compounds" . Microbiological Research 182 (2016) : 31-39.
http://dx.doi.org/10.1016/j.micres.2015.09.005
---------- MLA ----------
Torres, M.J., Brandan, C.P., Petroselli, G., Erra-Balsells, R., Audisio, M.C. "Antagonistic effects of Bacillus subtilis subsp. subtilis and B. amyloliquefaciens against Macrophomina phaseolina: SEM study of fungal changes and UV-MALDI-TOF MS analysis of their bioactive compounds" . Microbiological Research, vol. 182, 2016, pp. 31-39.
http://dx.doi.org/10.1016/j.micres.2015.09.005
---------- VANCOUVER ----------
Torres, M.J., Brandan, C.P., Petroselli, G., Erra-Balsells, R., Audisio, M.C. Antagonistic effects of Bacillus subtilis subsp. subtilis and B. amyloliquefaciens against Macrophomina phaseolina: SEM study of fungal changes and UV-MALDI-TOF MS analysis of their bioactive compounds. Microbiol Res. 2016;182:31-39.
http://dx.doi.org/10.1016/j.micres.2015.09.005