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http://dx.doi.org/10.4489/KJM.2004.32.1.008

Phytotoxicity of Endophytic Fungi and Characterization of a Phytotoxin Isolated from Gliocladium catenulatum from Pinus densiflora  

Choi, Gyung-Ja (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Park, Joong-Hyeop (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Kim, Heung-Tae (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Lee, Seon-Woo (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Choi, Jung-Sup (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Hong, Kyung-Sik (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Cho, Kwang-Yun (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Kim, Jin-Cheol (Biological Function Research Team, Korea Research Institute of Chemical Technology)
Publication Information
The Korean Journal of Mycology / v.32, no.1, 2004 , pp. 8-15 More about this Journal
Abstract
This study was conducted to discover new phytotoxins which may be used as lead molecules for the development of new herbicides. A total of 187 endophytic fungi were isolated from 11 plant species, which were collected from 8 locations in Korea. Their herbicidal activities were screened in vivo by herbicidal and duckweed bioassays after they were cultured in potato dextrose broth and rice solid media. Both fermentation broth and solid culture extract of Gliocladium catenulatum F0006 isolated from red pine (Pinus densiflora) showed 70% herbicidal activity only against cocklebur (Xanthium strumarium) out of the 10 weeds tested. Solid culture extract of F0034 isolated from arrowroot (Pueraria thunbergiana) exhibited 20 to 100% herbicidal activities against all of the weeds. Especially, shattercane (Sorghum bicolor), barnyardgrass (Echinochloa crus-galli), large crabgrass (Digitaria sanguinalis), and fall pauicum (Panicum dichtomiflorum) were sensitive to the solid culture extract of F0034. In addition, solid culture extract of F0043 isolated from red pine displayed 20% to 70% herbicidal activities only against 5 grass species, but not against 5 broad-leaf plant species. On the other hand, as the results of duckweed assay, 8 fermentation broths showed 100% growth inhibitory activity at concentrations less than 5.0% of culture supernatants and 12 solid cultures had a potent inhibitory activity against duckweed growth. A toxic metabolite was purified from the solid cultures of G. catenulatum F0006 by repeated column chromatography and bioassay. It caused a phytotoxic syndrome only on cocklebur out of the 10 weeds tested; it completely killed cocklebur seedlings at $500\;{\mu}g/ml$ and showed 85% herbicidal activity against cocklebur at $100\;{\mu}g/ml$. The molecular weight of the toxic metabolite is 238 daltons and its structure determination is underway.
Keywords
Endophytic fungus; Gliocladium catenulatum; Phytotoxicity; Toxic Metabolite;
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Times Cited By KSCI : 1  (Citation Analysis)
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