Diversity of antifungal actinomycetes in various vegetative soils of Korea

Lee, J. Y. and Hwang, B. K. (2002) Diversity of antifungal actinomycetes in various vegetative soils of Korea. Canadian Journal of Microbiology, 48 (5). pp. 407-417.

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Abstract

Diversity of actinomycetes and their antifungal activities against some plant pathogenic fungi were examined in various vegetative soils from 14 different sites in the western part of Korea. Actinomycete counts ranged from 1.17 × 106 to 4.20 × 106 cfu·g-1 dried soil. A total of 1510 actinomycetes were isolated from the soil samples. Streptomyces was predominant in soils with a pH range of 5.1-6.5, 9.1-13.0% moisture, and 9.1-11.0% organic matter. Most Micromonospora, Dactylosporangium, and Streptosporangium were distributed in soils with pH 4.0-5.0, 2.0-9.0% moisture, and 4.0-7.0% organic matter. Actinomadura and nocardioform actinomycetes were abundant in soils with pH 4.0-5.0 and 13.1-20.0% moisture and with 9.1-11.0 and 4.0-7.0% organic matter, respectively. Populations of Streptomyces were predominant in all the soils, but were highest in grassland and lowest in mountain-forest soils. Micromonospora was most abundant in pepper-field soil and nocardioform actinomycetes were highest in rice paddy field soil. Dactylosporangium was predominant in lake-mud sediments and pepper-field soil, Streptosporangium in lake-mud sediments, and Actinomadura in mountain-forest soil. Antifungal actinomycetes were abundant in orchard soil and lake mud. More than 50% of antifungal isolates from most soils were classified as genus Streptomyces. Actinomycete isolates that showed strong antifungal activity against Alternaria mali, Colletotrichum gloeosporioides, Fusarium oxysporum f.sp. cucumerinum, and Rhizoctonia solani were predominant in pepper-field soils, whereas those against Magnaporthe grisea and Phytophthora capsici were abundant in radish-field soils.Key words: actinomycetes, antifungal activity, plant pathogenic fungi, vegetative soils.

Item Type: Article
Additional Information: This study was supported financially by special grants from the Korea Ministry of Agriculture and Forestry, Agricultural R&D Promotion Center, and by the Korea Research Foundation (grant KRF-2000-908-G00002 to J.Y. Lee for a predoctoral fellowship).
Uncontrolled Keywords: actinomycetes, antifungal activity, plant pathogenic fungi, vegetative soils.
Author Affiliation: Laboratory of Molecular Plant Pathology, College of Life and Environmental Sciences, Korea University, Seoul 136-701, Korea.
Subjects: Soil Science and Microbiology
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 31 Aug 2012 09:01
Last Modified: 31 Aug 2012 09:02
Official URL: http://dx.doi.org/10.1139/w02-025
URI: http://eprints.icrisat.ac.in/id/eprint/7637

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