Abstract
Aims: Trichoderma harzianum strains T22 and T39 are two micro-organisms
used as active agents in a variety of commercial biopesticides and biofertilizers
and widely applied amongst field and greenhouse crops. The production, isolation,
biological and chemical characterization of the main secondary metabolites
produced by these strains are investigated.
Methods and Results: Of the three major compounds produced by strain T22,
one is a new azaphilone that shows marked in vitro inhibition of Rhizoctonia
solani, Pythium ultimum and Gaeumannomyces graminis var. tritici. In turn, filtrates
from strain T39 were demonstrated to contain two compounds previously
isolated from other T. harzianum strains and a new butenolide. The
production of the isolated metabolites was also monitored by liquid chromatography/
mass spectrometry during in vitro interaction with R. solani.
Conclusions: This paper reports the isolation and characterization of the main
secondary metabolites obtained from culture filtrates of two T. harzianum
strains and their production during antagonistic interaction with the pathogen
R. solani.
Significance and Impact of the Study: This is the first work on secondary
metabolites produced by the commercially applied strains T22 and T39. Our
results provide a better understanding of the metabolism of these fungi, which
are both widely used as biopesticides and/or biofertilizers in biocontrol.
AbstractAims: Trichoderma harzianum strains T22 and T39 are two micro-organismsused as active agents in a variety of commercial biopesticides and biofertilizersand widely applied amongst field and greenhouse crops. The production, isolation,biological and chemical characterization of the main secondary metabolitesproduced by these strains are investigated.Methods and Results: Of the three major compounds produced by strain T22,one is a new azaphilone that shows marked in vitro inhibition of Rhizoctoniasolani, Pythium ultimum and Gaeumannomyces graminis var. tritici. In turn, filtratesfrom strain T39 were demonstrated to contain two compounds previouslyisolated from other T. harzianum strains and a new butenolide. Theproduction of the isolated metabolites was also monitored by liquid chromatography/mass spectrometry during in vitro interaction with R. solani.Conclusions: This paper reports the isolation and characterization of the mainsecondary metabolites obtained from culture filtrates of two T. harzianumstrains and their production during antagonistic interaction with the pathogenR. solani.Significance and Impact of the Study: This is the first work on secondarymetabolites produced by the commercially applied strains T22 and T39. Ourresults provide a better understanding of the metabolism of these fungi, whichare both widely used as biopesticides and/or biofertilizers in biocontrol.
การแปล กรุณารอสักครู่..