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Microscopical Observation of Inhibition-behaviors against Diaporthe citri by Pre-treated with Pseudomonas putida Strain THJ609-3 on the Leaves of Citrus Plants

Authors
Ko, Yun JungKim, Ju SungKim, Ki DeokJeun, Yong Chull
Issue Date
10월-2014
Publisher
MICROBIOLOGICAL SOCIETY KOREA
Keywords
bio-fungicide; biological control; melanose; Satsuma mandarin
Citation
JOURNAL OF MICROBIOLOGY, v.52, no.10, pp.879 - 883
Indexed
SCIE
SCOPUS
KCI
Journal Title
JOURNAL OF MICROBIOLOGY
Volume
52
Number
10
Start Page
879
End Page
883
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/97215
DOI
10.1007/s12275-014-4399-z
ISSN
1225-8873
Abstract
Citrus melanose is one of the most important diseases in orchards cultivating citrus in the world. Although the disease does not cause yield loss, the profitability of the infected fruits is often reduced in the fresh-market, resulting in economic loss. In this study, disease reduction was proven by pre-treatment with Pseudomonas putida strain THJ609-3. In order to illustrate mechanism of the disease reduction by the bacterial strain, the infection behaviors of Diaporthe citri and necrosis deposit of plant tissue were observed using a fluorescence microscope. On the leaves pre-treated with the strain THJ609-3, germination rates of D. citri conidia were significantly decreased compared to those of the untreated control. Scanning electron microscopical observations showed that bacterial cells were attached to the surface of fungal hyphae. Furthermore, morphological change of germ tubes of the conidia was detected. These results suggest that the disease reduction may be caused by the direct antifungal activity of the bacterial strain on the leaf surfaces.
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