Abstract
The mycobiota of the Orchidarium of ELTE Botanical Garden (Budapest) has been studied applying aerobiological methods and isolating of tissue samples taken from 92 individuals of sixty orchid species. Among isolated basidiomycetaceous fungi 13 strains of Rhizoctonia solani were surviving in axenic culture. These symbiotic R. solani strains proved to be pathogenic on 24 cultivated plant species at varying degree. The symptoms of disease caused by R. solani strains isolated from orchids did not differ from that caused by reference strains. Three groups of strains could be separated regardless of their source or aggressivity. The host plants clustered into two groups, and their taxonomic position had no role in this respect. In general, we can assume that orchid associated Rhizoctonia strains are potential plant pathogens, and removed or withdrawn orchid stools should be treated as hazardous waste.
Highlights
The mycobiota of the Orchidarium of ELTE Botanical Garden (Budapest) has been studied applying aerobiological methods and isolating of tissue samples taken from 92 individuals of sixty orchid species
These symbiotic R. solani strains proved to be pathogenic on 24 cultivated plant species at varying degree
The host plants clustered into two groups, and their taxonomic position had no role in this respect
Summary
The mycobiota of the Orchidarium of ELTE Botanical Garden (Budapest) has been studied applying aerobiological methods and isolating of tissue samples taken from 92 individuals of sixty orchid species. Among isolated basidiomycetaceous fungi 13 strains of Rhizoctonia solani were surviving in axenic culture. These symbiotic R. solani strains proved to be pathogenic on 24 cultivated plant species at varying degree. The symptoms of disease caused by R. solani strains isolated from orchids did not differ from that caused by reference strains. We can assume that orchid associated Rhizoctonia strains are potential plant pathogens, and removed or withdrawn orchid stools should be treated as hazardous waste. Többségükben rovarbeporzású növények, 800 nemzetségükbe több mint 22 ezer faj tartozik. Fán lakó vagy talajban élő fajok egy részét különösen nagyra becsülik virágaik jelentős díszítő értéke miatt. Jelenleg - részben a biotechnológiai eljárásoknak is köszönhetően, - több ezer termesztett változat létezik. Ezért hasznosnak véltük az orhideákról izolált rizoktónia törzsek kórtani sajátosságainak alaposabb vizsgálatát
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