Dragonfly-Associated Trichoderma harzianum QTYC77 Is Not Only a Potential Biological Control Agent of Fusarium oxysporum f. sp. cucumerinum But Also a Source of New Antibacterial Agents

Journal of Agricultural and Food Chemistry
Shuxiang ZhangYinglao Zhang

Abstract

A strain isolated from the gut of Pantala flavescens was characterized as Trichoderma harzianum QTYC77. The strain was assessed as a potential biocontrol agent against Fusarium oxysporum f. sp. cucumerinum (FOC). Mycoparasitism and competing abilities of T. harzianum QTYC77 lead to inhibition of the mycelial growth of FOC, with the inhibition rate of 70.99%, in dual culture assays. Activities of chitinase and β-1,3-glucanase, responsible for fungal cell-wall degradation, were gradually increased and their activities were the maximum on the fifth day of fermentation with 23.20 and 1.84 U/mL, respectively. T. harzianum QTYC77 was discovered to have potent biocontrol potential with the control efficiency of 67.43% against the FOC in vivo pot experiment. Furthermore, two novel compounds azaphilone D (1) and E (2) along with three known metabolites 3-hydroxymethyl-6, 8-dimethoxycoumarin (3), harzianone (4), and pachybasin (5) were isolated and identified from T. harzianum QTYC77. Unfortunately, these metabolites did not show antifungal activities against FOC. However, both metabolites 1 and 3 displayed moderate activity against Staphylococcus aureus with disc diameters of zone of inhibition (ZOI) of 7.3 and 7.2 mm, respectively, com...Continue Reading

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