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  • Title: Amendment with peony root bark improves the biocontrol efficacy of Trichoderma harzianum against Rhizoctonia solani.
    Author: Lee TO, Khan Z, Kim SG, Kim YH.
    Journal: J Microbiol Biotechnol; 2008 Sep; 18(9):1537-43. PubMed ID: 18852509.
    Abstract:
    We tested Trichoderma harzianum as a biocontrol agent for Rhizoctonia solani AG2-1, using six natural antifungal materials to improve its efficacy. Among the six materials tested, peony (Paeonia suffruticosa) root bark (PRB) showed the strongest antifungal activity against R. solani AG2-1, and was not antagonistic to T. harzianum. Scanning electron microscopy showed that treatment with PRB extract resulted in shortened and deformed R. solani AG2-1 hyphal cells. The control of radish damping-off caused by R. solani AG2-1 was greatly increased by combined treatments of T. harzianum and PRB, as compared with either of the two treatments alone, with the control effect increased from 42.3-51.5% to 71.4-87.6%. The antifungal compound in PRB, which was isolated in chloroform and identified as paeonol by mass spectrometry, 1H NMR, and 13C NMR analyses, inhibited the growth of R. solani AG2-1 but not that of T. harzianum. Thus, PRB powder or extract may be used as a safe additive to T. harzianum to improve the control of the soil borne diseases caused by R. solani AG2-1.
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