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KMID : 0379120180460030213
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Korean Journal of Mycology
2018 Volume.46 No. 3 p.213 ~ p.225
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First Report of Six Trichoderma Species Isolated from Freshwater Environment in Korea
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Goh Jae-Duk
Nam Bo-Ra
Lee Jae-Sung
Mun Hye-Yeon
Oh Yoo-Sun
Lee Hyang-Burm
Chung Nam-Il
Choi Young-Joon
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Abstract
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Trichoderma (Hypocreaceae) is one of the most ubiquitous genera worldwide. This genus has an excellent ability to adapt to diverse environments, even under poor nutritional conditions, such as in freshwater. However, little is known about the diversity of Trichoderma species in freshwater environments. In this study, we isolated diverse fungal strains from algae, plant litter, and soil sediment in streams in Korea. The strains were identified based on molecular phylogenetic analyses of internal transcribed spacer (ITS) rDNA and translation elongation factor 1 (TEF1α) sequences. We also investigated their morphological characteristics by microscopic observation and determination of cultural features on different media. As a result, six Trichoderma species were found in Korea: T. afroharzianum, T. capillare, T. guizhouense, T. paraviridescens, T. reesei, and T. saturnisporum. Interestingly, T. paraviridescens showed both cellulose activity and hypoxia stress tolerance phenotypes, indicating its role as a decomposer in freshwater ecosystems. Our study revealed that freshwater environment could be a good candidate for investigating the species diversity of Trichoderma.
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KEYWORD
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Freshwater, Extracellular enzymes, ITS rDNA, Plant litter, TEF1α
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