Alternaria check for this species in other resources , biocontrol agent, biological control, chitinase, endopolygalacturonase, Trichoderma check for this species in other resources "/>
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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 4, No. 2, 2001, pp. 68-73
Bioline Code: ej01013
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 4, No. 2, 2001, pp. 68-73

 en In vitro biocontrol activity of Trichoderma harzianum check for this species in other resources on Alternaria alternata check for this species in other resources in the presence of growth regulators
Roco, Angela & Pérez, Luz María

Abstract

The in vitro biocontrol ability of Trichoderma harzianum check for this species in other resources on the phytopathogen Alternaria alternata check for this species in other resources improved in the presence of the growth regulators gibberellic acid (GA3), or indolacetic acid (IAA) or benzylaminopurine (BAP) or foliar nutrient at concentrations similar or higher than those used at the field level. These plant hormones decreased the secretion of endopolygalacturonase (endo-PG) of A. alternata by approximately 20%, did not modify endochitinase (endo-CH) secretion of T. harzianum and did not alter germination of conidia or mycelia growth of any of these fungi. The presence of T. harzianum decreased endo-PGase secretion of A. alternata by about 50%. This inhibitory effect was independent of the presence of growth regulators. The level of secreted endo-PG of T. harzianum was not modified by the presence of A. alternata, but the presence of this phytopathogen in cultures of T. harzianum, increased both the growth of the biocontroller and its secretion of endo-CH.

Keywords
Alternaria check for this species in other resources , biocontrol agent, biological control, chitinase, endopolygalacturonase, Trichoderma check for this species in other resources

 
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