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Journal of Applied Phycology

, Volume 31, Issue 1, pp 41–48 | Cite as

The natural triterpenoid toosendanin as a potential control agent of the ciliate Stylonychia mytilus in microalgal cultures

  • Ran Xu
  • Litao Zhang
  • Jianguo LiuEmail author
Article

Abstract

With the aim of identifying an effective and safe technique for reducing contamination by the ciliate, Stylonychia mytilus, in microalgal cultivation, the toxic effects of the natural triterpenoid toosendanin and ammonium bicarbonate on S. mytilus were studied. Toxicity tests showed that toosendanin and ammonium bicarbonate were highly toxic to S. mytilus, with 24 h LC50 values of 6.4 μg L−1 and 0.8 g L−1, respectively. The population density of S. mytilus decreased significantly when exposed to ≥ 2 μg L−1 toosendanin or ≥ 0.4 g L−1 ammonium bicarbonate. In addition, the S. mytilus control effects of toosendanin and ammonium bicarbonate and their safety in Chlorella pyrenoidosa were evaluated. It was found that ≤ 14 μg L−1 toosendanin had no obvious influence on photosynthesis and growth of C. pyrenoidosa and even increased the final cell density, with the highest being 12.3% over that of untreated cultures. Ammonium bicarbonate is the most widely used optimization technique for controlling contamination, but it has limited ability to reduce S. mytilus. Furthermore, ≥ 0.8 g L−1 ammonium bicarbonate inhibited photosynthesis and growth of C. pyrenoidosa, causing a 5.1% reduction in cell density or even a complete crop failure. Based on its high toxicity to S. mytilus and its relative safety to C. pyrenoidosa, together with its low commercial price and ecological acceptability, toosendanin is considered to be a good potential botanical pesticide for controlling S. mytilus contamination in microalgal mass cultivation.

Keywords

Toosendanin Ammonium bicarbonate Stylonychia mytilus Contamination control Microalgal cultivation 

Notes

Acknowledgements

This work was supported by National Key Research and Development Program—China (2016YFB0601004) and Hainan Aoji Biological Technology Co., Ltd. We thank Dr. John van der Meer (Pan-American Marine Biotechnology Association) for his assistance with proofreading.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.CAS Key Laboratory of Experimental Marine Biology, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Laboratory for Marine Biology and BiotechnologyQingdao National Laboratory for Marine Science and TechnologyQingdaoChina

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