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Revista Colombiana de Biotecnología

Print version ISSN 0123-3475

Abstract

GOMEZ RAMIREZ, Sonia Elena; GILCHRIST RAMELLI, Elizabeth  and  REYNALDI, Sebastián. Importance of strain and concentration range of conidia in the effect of Trichoderma asperellum on the growth of tomato seedlings Solanum lycopersicum L. Rev. colomb. biotecnol [online]. 2013, vol.15, n.1, pp.118-125. ISSN 0123-3475.

Longitudinal growth of shoot and roots was investigated in tomato seedlings (Solanum lycopersicum L) after application of four isolates of T. asperellum (T25, T46, T84 y T109). Only the isolate T109 caused a significant (p ≤ 0.05) increase of longitudinal growth of roots and shoots, and dry weight of seedlings was also stimulated from the first week after T109 application. The growth was significantly (p ≤ 0.05) stimulated by 105 and 106 conidia/ml, but it was not by 104, 107 and 108 conidia/ml. These results indicate that growth stimulus caused by T. asperellum in tomato seedlings, occurs only with specific isolates and at a specific concentration ranges.

Keywords : Trichoderma asperellum; Growth stimulation; Tomato seedlings; Trichoderma strains; concentration range.

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