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A novel method for promoting conidial production by a nematophagous fungus, Pochonia chlamydosporia AS6.8

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Abstract

A novel method was described for promoting conidial production of nematophagous fungus, Pochonia chlamydosporia AS6.8, by hydrogen peroxide (H2O2) treatment and two-stage cultivation. The fungi were first grown on potato dextrose agar plates to encourage vegetative growth, after briefly treating with 90 mM concentrations of H2O2, and then were transferred to water agar (WA) plates for sporulation. Sporulation of the P. chlamydosporia AS6.8 was significantly enhanced (as much as 15 times) using this method. Enhancement of sporulation by H2O2 (oxidative stress) and by transfer to WA (low-nutrient stress) was not synergistic. In order to make sure if the H2O2 had enhancing effect on other nematophagous fungi, we also evaluated the effect of H2O2 on sporulation of Arthrobotrys oligospora CBS 115.81 and Dactylellina cionopaga CBS 113355 besides P. chlamydosporia. And the result showed that 90 mM concentrations of H2O2 had enhancing effect on sporulation of all of the three isolates.

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Acknowledgments

This study was jointly supported by grants from National Plans of Science and Technology (Grant No. 2007BAI32B04), National Outstanding Youth Foundation (30625001) and National 863 Plan of China (2007AA021506). The authors thank Prof. Bruce Jaffee (the University of California at Davis) for serving as pre-submission reviewers and for his valuable comments and suggestions.

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Authors and Affiliations

  1. Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 1st Beicheng Western Road, 100101, Chaoyang District, Beijing, China

    Ling-Ling Xu, Feng Li, Hong-Yan Xie & Xing-Zhong Liu

  2. Graduate University of Chinese Academy of Sciences, 100049, Beijing, China

    Ling-Ling Xu, Feng Li & Hong-Yan Xie

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  1. Ling-Ling Xu
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  2. Feng Li
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  3. Hong-Yan Xie
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  4. Xing-Zhong Liu
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Correspondence to Xing-Zhong Liu.

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Xu, LL., Li, F., Xie, HY. et al. A novel method for promoting conidial production by a nematophagous fungus, Pochonia chlamydosporia AS6.8. World J Microbiol Biotechnol 25, 1989–1994 (2009). https://doi.org/10.1007/s11274-009-0099-y

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