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Bioprocess and Biosystems Engineering

, Volume 35, Issue 9, pp 1455–1465 | Cite as

Enhanced thermotolerance and ethanol tolerance in Saccharomyces cerevisiae mutated by high-energy pulse electron beam and protoplast fusion

  • Min Zhang
  • Yu Xiao
  • Rongrong Zhu
  • Qin Zhang
  • Shi-Long Wang
Original Paper

Abstract

To increase thermotolerance and ethanol tolerance in Saccharomyces cerevisiae strain YZ1, the strategies of high-energy pulse electron beam (HEPE) and three rounds of protoplast fusion were explored. The YF31 strain had the characteristics of resistant to high-temperature, high-ethanol tolerance, rapid growth and high yield. The YF31 could grow on plate cultures up to 47 °C, containing 237.5 g L−1 of ethanol. In particular, the mutant strain YF31 generated 94.2 ± 4.8 g L−1 ethanol from 200 g glucose L−1 at 42 °C, which was 2.48 times the production of the wild strain YZ1. Results demonstrated that the variant phenotypes from the strains screening by HEPE irradiation could be used as parent stock for yeast regeneration and the protoplast fusion technology is sufficiently powerful in combining suitable characteristics in a single strain for ethanol fermentation.

Keywords

High-energy pulse electron beam Protoplast fusion Multi-tolerance Ethanol fermentation Saccharomyces cerevisiae 

Notes

Acknowledgments

The authors thank the Genetically Modified Organisms Breeding Major Projects of China (No.2009ZX08011-032B) and the National Natural Science Foundation of China (Grant No. 31140038) for funding this study.

Supplementary material

449_2012_734_MOESM1_ESM.doc (583 kb)
Supplementary material 1 (DOC 583 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Min Zhang
    • 1
  • Yu Xiao
    • 1
  • Rongrong Zhu
    • 1
  • Qin Zhang
    • 1
  • Shi-Long Wang
    • 1
  1. 1.School of Life Science and TechnologyTongji UniversityShanghaiPeople’s Republic of China

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