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Enhancement of gibberellic acid production from Fusarium fujikuroi by mutation breeding and glycerol addition

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Abstract

Gibberellic acid (GA3) is a natural plant growth hormone that has been widely used in agriculture and horticulture. To obtain higher GA3 producing strains, the method of screening the strains for resistance to simvastatin was used after treatment with nitrosoguanidine (NTG) and gamma rays. The rationale for the strategy was that mutants showing simvastatin resistance were likely to be high GA3 producers, as their activity of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase is relatively more effective. GA3 yield of mutant S109 increased by 14.2% than that of the original strain. The GA3 production ability in mutant S109 remained relatively stable after ten generations. With the addition of 0.4 g glycerol on the 5th day during the fermentation process in Erlenmeyer flask, maximum GA3 production of 2.7 g/L was achieved by this mutant, exhibiting 28.6% increase compared with original strain. Furthermore, we also achieved 2.8 g/L GA3 and had a 33.3% increase with addition 20 g glycerol on the 5th day during the fermentation process in a 5-L bioreactor. Our results indicated efficient GA3 production could be achieved on the condition that the supply of glycerol at the suitable conditions. This study would lay a foundation for industrial production of GA3.

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Funding

This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant no. Q19C010006, and Educational Commission of Zhejiang Province, China under Grant no. Y201738062.

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Correspondence to Zhi-Qiang Liu.

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The authors declare that they have no conflict of interest.

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Peng, XL., Zhao, WJ., Wang, YS. et al. Enhancement of gibberellic acid production from Fusarium fujikuroi by mutation breeding and glycerol addition. 3 Biotech 10, 312 (2020). https://doi.org/10.1007/s13205-020-02303-4

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  • DOI: https://doi.org/10.1007/s13205-020-02303-4

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