An antibiotic fusaricidin: A cyclic depsipeptide from Paenibacillus polymyxa E681 induces systemic resistance against Phytophthora blight of red-pepper

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Title
An antibiotic fusaricidin: A cyclic depsipeptide from Paenibacillus polymyxa E681 induces systemic resistance against Phytophthora blight of red-pepper
Author(s)
S H Lee; Y E Cho; Seung Hwan Park; K Balaraju; J W Park; S W Lee; K Park
Bibliographic Citation
Phytoparasitica, vol. 41, no. 1, pp. 49-58
Publication Year
2013
Abstract
In this study fusaricidin, a cyclic depsipeptide isolated from Paenibacillus polymyxa E681 (E681), was demonstrated to control Phytophthora blight infection caused by Phytophthora capsici in red-pepper. The minimal inhibitory concentration (MIC) of fusaricidin was found to be 16 ppm against P. capsici. The disease severity of P. capsici was 40% at 0.1 ppm of fusaricidin when compared with water-treated control (81.7%) on post-treatment, whereas the disease severities on pre-treatment were 45% and 83. 3% in fusaricidin (0.1 ppm) and water-treated control, respectively, in red-pepper plants. Significant (P < 0.05) disease suppression was observed on treatment with fusaricidin (0.1 ppm) by foliar spray and soil drench. The disease severity was drastically reduced to 3.3% by soil drench of fusaricidin (1.0 ppm), whereas in water-treated control, the disease severity was 83. 3% in the first experiment. Fusaricidin at 0.1 ppm reduced disease severity of P. capsici to 27.5% when compared with positive control (43.1%) and water-treated control (66.2%) in the second experiment. Soft rot disease in tobacco was suppressed upon treatment with fusaricidin at 1.0 ppm by leaf infiltration. RT-PCR analyses of Arabidopsis thaliana revealed that there was an up-regulation of pathogenesis-related (PR) gene expression in wild type A. thaliana (Col-0), while there was no accumulation of PR genes, which implies that the mechanism of protection might be based on a salicylic acid-dependent pathway. This is the first report that fusaricidin exhibits protection against plant pathogens in addition to activity as an antibiotic agent. Hence, E681 can play a role in plant protection by secretion of ISR elicitors including fusaricidin.
Keyword
Antifungal assayBiocontrol agentCapsicum annuumDefense gene expressionDisease suppressionPhytophthora capsiciSoil drench
ISSN
0334-2123
Publisher
Springer
DOI
http://dx.doi.org/10.1007/s12600-012-0263-z
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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