Abstract
This study investigates the biocontrol potential of Trichoderma asperellum mutants against Rhizoctonia solani, Alternaria alternata, and Fusarium oxysporum and growth promotion of Populus davidiana × P. alba var. pyramidalis (PdPap poplar) seedlings. A T-DNA insertion mutant library of T. asperellum was constructed using Agrobacterium tumefaciens-mediated transformation. Sixty-five positive transformants (T1–T65) were obtained. Growth rates of the mutants T39 and T45 were the same, 39.68% faster than the WT. In toxin tolerance tests, only T39 had greater tolerance to A. alternata fermentation broth than the WT, but mutant T45 had the same tolerance as the WT to all fermentation broths. Furthermore, T39 and T45 had a greater antagonistic ability than the WT strain against R. solani and A. alternata. The inhibition rate of the mutants T39 and T45 against A. alternata are 73.92% and 80.76%, respectively, and 63.51% and 63.74%, respectively. Furthermore, the three strains increased the activities of superoxide dismutases, peroxidase, catalase (CAT) and phenylalanine ammonia lyase (PAL) in PdPap seedling leaves. CAT and PAL activity in the PdPap seedling leaves was 11.25 and 5.50 times higher, respectively, in the presence of T39 than in the control group and 12 and 6.35 times higher, respectively, in the presence of T45 than in the control group. All three strains promoted seedling growth and the root and stem development, especially mutant T45. Mutants T39 and T45 reduced the incidence of pathogenic fungi in poplar and stimulated poplar seedling growth.
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Project funding: The work was supported by the National High Technology Research and Development Program (13th Five-Year Plan Program, Grant Number 2016YFC0501505) and the Fundamental Research Funds of the Central University, China (Grant Number 2572017CA06).
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Corresponding editor: Tao Xu.
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Guo, R., Wang, Z., Zhou, C. et al. Biocontrol potential of Trichoderma asperellum mutants T39 and T45 and their growth promotion of poplar seedlings. J. For. Res. 31, 1035–1043 (2020). https://doi.org/10.1007/s11676-018-0797-0
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DOI: https://doi.org/10.1007/s11676-018-0797-0