Induction of conidiation by endogenous volatile compounds in Trichoderma spp

Light and starvation are two principal environmental stimuli inducing conidiation in the soil micromycete Trichoderma spp. We observed that volatiles produced by conidiating colonies of Trichoderma spp. elicited conidiation in colonies that had not been induced previously by exposure to light. The i...

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Bibliographic Details
Published in:FEMS microbiology letters 2008-07, Vol.284 (2), p.231-236
Main Authors: Nemcovic, Marek, Jakubíková, Lucia, Víden, Ivan, Farkas, Vladimír
Format: Article
Language:English
Subjects:
Carbon compounds
Chromatography, Gas
Colonies
conidiation
Darkness
Environmental effects
fungi
Headspace
Interspecific
Ketones - metabolism
Microbiology
Micromycetes
Octanol
Octanols - metabolism
Organic chemistry
Organic compounds
signaling
Solid phase methods
Solid phases
Spores, Fungal - physiology
sporulation
Trichoderma
Trichoderma - metabolism
Trichoderma - physiology
Vapors
VOCs
Volatile compounds
Volatile organic compounds
Volatiles
Volatilization
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Summary:Light and starvation are two principal environmental stimuli inducing conidiation in the soil micromycete Trichoderma spp. We observed that volatiles produced by conidiating colonies of Trichoderma spp. elicited conidiation in colonies that had not been induced previously by exposure to light. The inducing effect of volatiles was both intra- and interspecific. Chemical profiles of the volatile organic compounds (VOCs) produced by the nonconidiated colonies grown in the dark and by the conidiating colonies were compared using solid-phase microextraction of headspace samples followed by tandem GC-MS. The conidiation was accompanied by increased production of eight-carbon compounds 1-octen-3-ol and its analogs 3-octanol and 3-octanone. When vapors of these compounds were applied individually to dark-grown colonies, they elicited their conidiation already at submicromolar concentrations. It is concluded that the eight-carbon VOCs act as signaling molecules regulating development and mediating intercolony communication in Trichoderma.
ISSN:0378-1097
1574-6968
DOI:10.1111/j.1574-6968.2008.01202.x