Dataset Information

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.

ABSTRACT: Biological control of plant diseases has gained acceptance in recent years. Bacillus subtilis?UMAF6639 is an antagonistic strain specifically selected for the efficient control of the cucurbit powdery mildew fungus Podosphaera fusca, which is a major threat to cucurbits worldwide. The antagonistic activity relies on the production of the antifungal compounds iturin and fengycin. In a previous study, we found that UMAF6639 was able to induce systemic resistance (ISR) in melon and provide additional protection against powdery mildew. In the present work, we further investigated in detail this second mechanism of biocontrol by UMAF6639. First, we examined the signalling pathways elicited by UMAF6639 in melon plants, as well as the defence mechanisms activated in response to P.?fusca. Second, we analysed the role of the lipopeptides produced by UMAF6639 as potential determinants for ISR activation. 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. We also showed that surfactin lipopeptide is a major determinant for stimulation of the immune response. These results reinforce the biotechnological potential of UMAF6639 as a biological control agent.

SUBMITTER: Garcia-Gutierrez L

PROVIDER: S-EPMC3815921 | biostudies-literature | 2013 May

REPOSITORIES: biostudies-literature

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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 Laura L Zeriouh Houda H Romero Diego D Cubero Jaime J de Vicente Antonio A Pérez-García Alejandro A

Microbial biotechnology 20130110 3

Biological control of plant diseases has gained acceptance in recent years. Bacillus subtilis UMAF6639 is an antagonistic strain specifically selected for the efficient control of the cucurbit powdery mildew fungus Podosphaera fusca, which is a major threat to cucurbits worldwide. The antagonistic activity relies on the production of the antifungal compounds iturin and fengycin. In a previous study, we found that UMAF6639 was able to induce systemic resistance (ISR) in melon and provide addition ...[more]

PMID: 23302493

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Project description:Infection by the pathogen grape powdery mildew (Erysiphe necator) causes changes in the transcriptome of its susceptible host Vitis vinifera. Infection triggers the host to synthesize the signaling molecule salicylic acid (SA) which regulates the expression of a broad range of defense-related plant genes. In addition, it is hypothesized that E. necator directly modulates gene expression in V. vinifera via the haustorial complex. This microarray experiment was designed to dissect host transcriptome changes triggered directly by E. necator infection and indirectly through the SA response. We accomplished this by conducting two separate global leaf transcriptome analyses using the Vitis Affymetrix GeneChip platform: in one, we compared the leaves with fully established PM colonies to healthy reference leaves, in another, we compared healthy leaves with artificially elevated SA levels to healthy reference leaves. Overlaying host transcriptome changes from these two experiments enabled us to glean out V. vinifera genes that modulate their expression in response E. necator in an SA-independent manner. We characterized gene expression profiles in (1) healthy reference leaves, (2) leaves with well-established by E. necator colonies, and (3) healthy leaves in which SA levels were artificially elevated by the presence of methyl salicylate (15 µM) in the atmosphere. Treatments (1) and (2) differed only in the presence E. necator infection, whereas treatments (1) and (3) differed only in SA levels. Consequently, statistical comparisons were made only between signal intensities from treatments (1) and (2) and from treatments (1) and (3). Each treatment was done in three biological repeats, that is, each experiment was repeated three times in 14-day intervals with dedicated biological material (plants were used in a single replicate and not reused in another repeat or treatment). Each biological replicate consisted of 10 potted vines. For RNA extraction, two young leaves were harvested from each of the 10 vines and pooled into a single sample.

Dataset Information

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.

Publications

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.

Similar Datasets

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