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Potential biocontrol efficacy of Trichoderma atroviride with cellulase expression regulator ace1 gene knock-out

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Abstract

The biocontrol function of the repressor of cellulase expression I (ACE1) in Trichoderma atroviride was verified through constructing Δace1 mutant strain by Agrobacterium tumefaciens-mediated transformation. The activities of cell wall-degrading enzymes (cellulase, xylanase, chitinase, β-1,3-glucanase, and protease) in the supernatant of Δace1 mutant strain were distinctly higher than those of control strain, followed with the elevation of related genes transcript levels. Besides, the Δace1 mutant resulted in an elevating transcript level of xyr1, but no obvious change in the expression of cre1, which suggested that ACE1 was negative regulator of the xyr1 transcription, but not involved in cre1 transcription. On core polyketide synthases of four biosynthesis gene clusters for antibiotic secondary metabolites, only the transcription levels of encoding genes Try83179/TryH and Aza79482/AzaJ in Δace1 mutant strain were significantly higher than that in wild-type during antagonizing with pathogenic fungi Fusarium oxysporum and Rhizoctonia solani (with the inhibition rate of 30.7 and 19.8%, respectively). The biocontrol function of Δace1 mutant strain was remarkably enhanced. The results indicated that ACE1, indeed, acted as a repressor for cell wall-degrading enzymes and PKSs expression in T. atroviride, and the Δace1 mutant strain effectively made related enzymes activities improved with potential enhancement of biocontrol potency.

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Acknowledgements

We really appreciate all the useful comment and support from our colleagues in Jiangxi University of Technology, China.

Funding

This work was supported by Jiangxi Provincial Science and Technology Project of Ministry of Education (Project No.: GJJ161137) and Natural Science Project of Jiangxi Science and Technology College (Project No.: 16ZRYB03).

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  1. Jiangxi University of Technology, Nanchang, 330098, Jiangxi, China

    Chunjuan Fang & Xiaoyan Chen

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  1. Chunjuan Fang
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  2. Xiaoyan Chen
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Correspondence to Chunjuan Fang.

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All procedures of this study were complied with local experimental operation specification. In addition, no relevant ethical statement was needed to be declared.

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Fang, C., Chen, X. Potential biocontrol efficacy of Trichoderma atroviride with cellulase expression regulator ace1 gene knock-out. 3 Biotech 8, 302 (2018). https://doi.org/10.1007/s13205-018-1314-z

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