Journal
ANNALS OF MICROBIOLOGY
Volume 63, Issue 3, Pages 1177-1185Publisher
SPRINGER
DOI: 10.1007/s13213-012-0576-7
Keywords
Pseudomonas aurantiaca JD37; Plant growth promotion; Biocontrol; Induced systemic resistance; Bipolaris maydis
Categories
Funding
- National Natural Science Foundation of China [30930019]
- Shanghai Municipal Science and Technology Commission [11440502300]
- Shanghai Municipal Education Commission [11YZ87]
- Shanghai Normal University [SK201111]
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Some Pseudomonas aurantiaca strains have been found to facilitate plant growth. A P. aurantiaca JD37 strain isolated from a suburb of Shanghai, China, was found to effectively colonize the rhizosphere soil and internal roots of maize (Zea mays L.) and promote maize growth. Agar diffusion assays and biocontrol effect experiments showed that strain JD37 had significant antagonistic activity against Bipolaris maydis, as well as a high biocontrol effect on southern maize leaf blight caused by B. maydis. PCR detection, associated with reverse-phase high-performance liquid chromatography assays, showed that strain JD37 might produce a number of important antibacterial substances, such as phenazine-1-carboxylic acid, pyrrolnitrin and 2,4-diacetylphloroglucinol. The crude bacterial extracts and the cell-free supernatant of strain JD37 were found to induce resistance in maize against B. maydis and reduce plant disease. Our results indicate the potential of some bacteria for producing bacterial compounds that serve as inducers of disease resistance, which is an attractive alternative to the application of chemical fertilizers, pesticides and supplement in agricultural practices.
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