Biological characteristic and biocontrol mechanism of Trichoderma harzianum T-A66 against bitter gourd wilt caused by Fusarium oxysporum


We isolated a new Trichoderma harzianum strain, named T-A66. Potato dextrose agar (PDA) was the best medium for both mycelium growth and sporulation of T-A66 strain, while sucrose and potassium nitrate were the best source of carbon and nitrate, respectively. T-A66 strain and its culture filtrate significantly antagonized the growth of the pathogen Fusarium oxysporum in in vitro tests. An experiment using potted plants showed that the T-A66 strain promoted growth and induced disease resistance of bitter gourd seedlings to bitter gourd wilt caused by F. oxysporum, by inducing quick H2 O2 burst and callose deposition, as well as increasing antioxidant enzymes activities and phenolic compounds content. Indole acetic acid (IAA) was involved in the beneficial effects of T-A66. Ultimately, T-A66 strain diminished membrane lipid peroxidation and cell death, and controlled successfully bitter gourd wilt in greenhouse with a biocontrol efficiency of 90.32% after 15 days of F. oxysporum inoculation. The results suggested a good biocontrol potential of T-A66 strain against bitter gourd wilt.

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This work was supported by grants from the Key Scientific Research Projects of Institutions of Higher Learning of Henan (20A210031), the Natural Science Foundation of Henan (182300410097), the Open Fund of Key Laboratory of three Gorges Regional Plant Genetics and Germplasm Enhancement (CTGU) (2018KBC07), the School-based Project of Zhoukou Normal University (ZKNUB1201802).

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Correspondence to Fuli Zhang or Kai Dou or Faju Chen.

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Zhang, F., Liu, C., Wang, Y. et al. Biological characteristic and biocontrol mechanism of Trichoderma harzianum T-A66 against bitter gourd wilt caused by Fusarium oxysporum. J Plant Pathol (2020).

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  • T. harzianum isolate T-A66
  • Biocontrol potential
  • Bitter gourd wilt
  • Callose deposition
  • IAA production