The expression of extracellular fungal cell wall hydrolytic enzymes in different Trichoderma harzianum isolates correlates with their ability to control Pyrenochaetal lycopersici

Luz María Pérez, XIMENA ALEJANDRA BESOAIN CANALES, Mauricio Reyes, Gonzalo Pardo, Jaime Montealegre

Research output: Contribution to journalReview articlepeer-review

20 Scopus citations

Abstract

Four isolates of Trichoderma harzianum (ThN3, Th11, Th12 and Th16) were selected for their ability to control the in vitro development of the tomato root pathogen Pyrenochaeta lycopersici. Analysis of the mechanisms involved in biocontrol showed that the formation of non-volatile metabolites appears to be one of those involved in biocontrol of P. lycopersici by all T. harzianum isolates tested. Nevertheless, the higher secretion of chitinases, both in number of isoenzymes and activity by the Th11 strain, correlated well with its higher ability to control this agent in laboratory and greenhouse experiments as compared to the other T. harzianum isolates tested. The secretion of β -1,3-endoglucanases and/or proteases appeared to have less significance than endochitinases in the biological control of P. lycopersici.

Original languageEnglish
Pages (from-to)401-410
Number of pages10
JournalBiological Research
Volume35
Issue number3-4
StatePublished - 1 Jan 2002

Keywords

  • Biological control
  • Corky root
  • Pyrenochaeta lycopersici
  • Tomato root diseases
  • Trichoderma harzianum

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