Abstract

SOSA RODRIGUEZ, TIFFANY; SANCHEZ NIEVES, JIMENA; MORALES GUTIERREZ, ESPERANZA  and  CRUZ CORTES, FERNANDO. Arbuscular Mycorrhizae-Trichoderma harzianum (Moniliaceae) Interaction and Effects on Brachiaria decumbens (Poaceae)’s Growth. Acta biol.Colomb. [online]. 2006, vol.11, n.1, pp.43-54. ISSN 0120-548X.

The laboratory trial was made using native’s Arbuscular Mycorrhizal Fungi (AMF) sampled in Pennisetum clandestinum’s rhizospheric soil obtained from Universidad Nacional de Colombia (Bogotá). Brachiaria decumbens was used as the host plant, growing in draining pots of steamed sandy soil supplemented with a complete nutritive solution. Four different treatments were tested to determine the kind of interaction between Arbuscular Mycorrhizal Fungi and Trichoderma harzianum and the effect of AMF plus T. harzianum on B. decumbens growth: plants with AMF inoculum, plants with T. harzianum, plants with AMF plus T. harzianum and uninoculated controls. Root colonization was decreased by T. harzianum, although AMF spores/g dry soil quantity was unaffected by this fungi. On the other hand, T. harzianum’s population level (CFU /g dry soil) decreased in presence of AMF. These results shows an interaction between AMF and T. harzianum and this interaction affects as AMF development as population density of T. harzianum. Based in the values of the plant growth parameters studied, is possible to conclude the AMF-T. harzianum interaction has a neutral effect on B. decumbens’s growth.

Keywords : Arbuscular Mycorrhizal Fungi (AMF); Trichoderma harzianum; rizosphere; interaction.

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