Abstract

MARIN, Marieta et al. In vitro antagonistic activity of Tsukamurella paurometabola C-924 against phytopathogens. Rev. Protección Veg. [online]. 2013, vol.28, n.2, pp. 132-137. ISSN 1010-2752.

The aim of this work was to determine the potential of Tsukamurella paurometabola C-924 as a biological control agent of phytopathogenic fungi by its in vitro evaluation on the culture media Agar Triptone Soy (ATS) and Potato Dextrose Agar. The antagonistic activity was determined by measuring the diameter of the fungal colonies grown in presence of the bacterium every 24 hours; the inhibition percentages were calculated by comparing each diameter of these colonies with those of their respective controls grown in absence of the bacterium. T. paurometabola C-924 showed an antagonistic activity on both culture media. The highest inhibition values were determined on ATS against Alternaria longipes (Ellis and Everh.), Bipolaris oryzae (Breda de Hann), Colletotrichum gloesporioides (Penz). Fusarium oxysporum f. sp. cubense (E.F. Sm), Pestalotia palmarum (Cooke) and Thielaviopsis paradoxa (De Seynes). On both culture media, the lowest inhibition percentage was found against Pythium debaryanum (R. Hesse). The results suggested that T. paurometabola C924 had in vitro potential as an antagonistic agent against the phytopathogenic fungi tested.

Keywords : Alternaria longipes; Bipolaris oryzae; Colletotrichum gloeosporioides; Fusarium oxysporum f. sp. cubense; Pestalotia palmarum; Thielaviopsis paradoxa; Pythium debaryanum; antagonism.

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