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- Title
Isolation of <italic>Burkholderia cepacia</italic> JBK9 with plant growth-promoting activity while producing pyrrolnitrin antagonistic to plant fungal diseases.
- Authors
Jung, Byung Kwon; Hong, Sung-Jun; Park, Gun-Seok; Kim, Min-Chul; Shin, Jae-Ho
- Abstract
<italic>Burkholderia</italic> species are widely distributed across wide ecological niches. Many genera of <italic>Burkholderia</italic> are known to be associated with plants and are involved in processes such as suppression of soil-borne pathogens, acceleration of plant growth and endophytic colonization. In the present study, a strain belonging to the <italic>Burkholderia cepacia</italic> complex, which was termed JBK9, was isolated. The strain JBK9 showed broad-spectrum antifungal activities against <italic>Phytophthora capsici, Fusarium oxysporum</italic>, and <italic>Rhizoctonia solani</italic>, which are representative phytopathogenic fungi, inhibiting their growth by 59.56, 51.92, and 34.22%, respectively. The strain produced an antifungal compound that was confirmed to be pyrrolnitrin by TLC, HPLC, and NMR analyses. Using an in vitro assay for plant root colonization, we observed that the population densities of <italic>B. cepacia</italic> JBK9 on the upper 1 cm of host plant roots were significantly different between <italic>Burkholderia</italic> species. The high motility of these strains is likely to have contributed to their efficient root colonization. The isolated strain was evaluated in vivo for its ability to control <italic>Phytophthora</italic> blight via a pot test. Compared with <italic>Burkholderia</italic> strains KCTC 2973 and ATCC 25416, <italic>B. cepacia</italic> JBK9 demonstrated a stronger antifungal activity against <italic>P. capsici</italic>. The strain <italic>B. cepacia</italic> JBK9 could be further developed as a biological control agent for pepper plants.
- Publication
Applied Biological Chemistry, 2018, Vol 61, Issue 2, p173
- ISSN
2468-0834
- Publication type
Article
- DOI
10.1007/s13765-018-0345-9