Resumo

JAIMES SUAREZ, YEIRME YANETH; MORENO VELANDIA, CARLOS ANDRÉS  e  COTES PRADO, ALBA MARINA. Induced Systemic Resistance Against Fusarium oxysporum In Tomato By Trichoderma koningiopsis Th003. Acta biol.Colomb. [online]. 2009, vol.14, n.3, pp.111-120. ISSN 0120-548X.

Trichoderma koningiopsis Th003 has proved to be an efficient biocontrol agent of different plant pathogens including Fusarium oxysporum, causing agent of tomato crown and root rot. With the aim to studying whether Th003 has the ability to induce defense systemic responses to control Fusarium oxysporum infection, tomato plants (Solanumlycopersicum Mill.) were sown in pots using split root modified method. When Th003 was applied to one root portion 96 h before inoculating F. oxysporum in the other root portion, delayed colonization of the plant's vascular system was observed as compared with plants inoculated only with the pathogen. Since the antagonist and the pathogen remained spatially separated in the host, the protection effect in plants was attributed to a systemic activity induced by Th003. In a commercial greenhouse the biopesticide based upon Th003 reduced significantly (P<0.05) by 35% the incidence of crown and root rot caused >F. oxysporum f. sp. Lycopersici, compared with untreated control. T. koningiopsis Th003 showed ability to control F. oxysporum f. sp. radicis-lycopersici by inducing systemic defense responses in tomato plants.

Palavras-chave : Induced systemic resistance; tomato; Fusarium oxysporum; Trichoderma koningiopsis.

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