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The antagonistic strain Bacillus subtilis UMAF6639 also confers protection to melon plants against cucurbit powdery mildew by activation of jasmonate- and salicylic acid-dependent defence responses.

García-Gutiérrez L, Zeriouh H, Romero D, Cubero J, de Vicente A, Pérez-García A - Microb Biotechnol (2013)

Bottom Line: In a previous study, we found that UMAF6639 was able to induce systemic resistance (ISR) in melon and provide additional protection against powdery mildew.Our results demonstrated that UMAF6639 confers protection against cucurbit powdery mildew by activation of jasmonate- and salicylic acid-dependent defence responses, which include the production of reactive oxygen species and cell wall reinforcement.These results reinforce the biotechnological potential of UMAF6639 as a biological control agent.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Hortofruticultura Subtropical y Mediterránea 'La Mayora'-IHSM-UMA-CSIC, Departamento de Microbiología, Universidad de Málaga, Bulevar Louis Pasteur 31-Campus Universitario de Teatinos, 29071 Málaga, Spain.

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Schematic representation of the mechanisms of action of B. subtilis UMAF6639 against the cucurbit powdery mildew fungus P. fusca. UMAF6639 acts in the phyllosphere through direct antagonism mediated by the production of iturin (itu) and fengycin (fen) antifungal lipopeptides. In the rhizosphere, UMAF6639 acts by activation of JA- and SA-dependent defence responses, in which surfactin (srf) is an elicitor. These defence responses include the production of reactive oxygen species (ROS) and cell wall deposits (cell wall reinforcement), which are activated after pathogen attack (priming).
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fig07: Schematic representation of the mechanisms of action of B. subtilis UMAF6639 against the cucurbit powdery mildew fungus P. fusca. UMAF6639 acts in the phyllosphere through direct antagonism mediated by the production of iturin (itu) and fengycin (fen) antifungal lipopeptides. In the rhizosphere, UMAF6639 acts by activation of JA- and SA-dependent defence responses, in which surfactin (srf) is an elicitor. These defence responses include the production of reactive oxygen species (ROS) and cell wall deposits (cell wall reinforcement), which are activated after pathogen attack (priming).

Mentions: In summary, as represented in Fig. 7, B. subtilis UMAF6639 is able to mitigate cucurbit powdery mildew disease by at least two different mechanisms: (i) by an antagonistic action mediated by the production of the antifungal lipopeptides iturin and fengycin in the phyllosphere and (ii) by activation of JA- and SA-dependent defence responses in the rhizosphere, in which surfactin lipopeptide plays a major role as an elicitor for stimulation of the immune response. These results reinforce the biotechnological potential of B. subtilis UMAF6639 as both an antagonistic agent and an inducer of systemic resistance. In relation to this, sequencing of the UMAF66339 genome is currently underway. Detailed analysis of its genome should reveal a more realistic picture of the biocontrol potential of this biotechnologically interesting Bacillus strain.


The antagonistic strain Bacillus subtilis UMAF6639 also confers protection to melon plants against cucurbit powdery mildew by activation of jasmonate- and salicylic acid-dependent defence responses.

García-Gutiérrez L, Zeriouh H, Romero D, Cubero J, de Vicente A, Pérez-García A - Microb Biotechnol (2013)

Schematic representation of the mechanisms of action of B. subtilis UMAF6639 against the cucurbit powdery mildew fungus P. fusca. UMAF6639 acts in the phyllosphere through direct antagonism mediated by the production of iturin (itu) and fengycin (fen) antifungal lipopeptides. In the rhizosphere, UMAF6639 acts by activation of JA- and SA-dependent defence responses, in which surfactin (srf) is an elicitor. These defence responses include the production of reactive oxygen species (ROS) and cell wall deposits (cell wall reinforcement), which are activated after pathogen attack (priming).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3815921&req=5

fig07: Schematic representation of the mechanisms of action of B. subtilis UMAF6639 against the cucurbit powdery mildew fungus P. fusca. UMAF6639 acts in the phyllosphere through direct antagonism mediated by the production of iturin (itu) and fengycin (fen) antifungal lipopeptides. In the rhizosphere, UMAF6639 acts by activation of JA- and SA-dependent defence responses, in which surfactin (srf) is an elicitor. These defence responses include the production of reactive oxygen species (ROS) and cell wall deposits (cell wall reinforcement), which are activated after pathogen attack (priming).
Mentions: In summary, as represented in Fig. 7, B. subtilis UMAF6639 is able to mitigate cucurbit powdery mildew disease by at least two different mechanisms: (i) by an antagonistic action mediated by the production of the antifungal lipopeptides iturin and fengycin in the phyllosphere and (ii) by activation of JA- and SA-dependent defence responses in the rhizosphere, in which surfactin lipopeptide plays a major role as an elicitor for stimulation of the immune response. These results reinforce the biotechnological potential of B. subtilis UMAF6639 as both an antagonistic agent and an inducer of systemic resistance. In relation to this, sequencing of the UMAF66339 genome is currently underway. Detailed analysis of its genome should reveal a more realistic picture of the biocontrol potential of this biotechnologically interesting Bacillus strain.

Bottom Line: In a previous study, we found that UMAF6639 was able to induce systemic resistance (ISR) in melon and provide additional protection against powdery mildew.Our results demonstrated that UMAF6639 confers protection against cucurbit powdery mildew by activation of jasmonate- and salicylic acid-dependent defence responses, which include the production of reactive oxygen species and cell wall reinforcement.These results reinforce the biotechnological potential of UMAF6639 as a biological control agent.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Hortofruticultura Subtropical y Mediterránea 'La Mayora'-IHSM-UMA-CSIC, Departamento de Microbiología, Universidad de Málaga, Bulevar Louis Pasteur 31-Campus Universitario de Teatinos, 29071 Málaga, Spain.

Show MeSH
Related in: MedlinePlus