Add time:09/03/2019         Source:sciencedirect.com

Three basidiomycetes, Lentinus squarrosulus, Cerrena meyenii and Gloeophyllum striatum were studied as potential antagonists against Rigidoporus lignosus, the cause of white rot of Hevea brasiliensis. During direct confrontation between colonies of R. lignosus and the three antagonists on malt agar, R. lignosus colonies ceased growth and were overgrown by the opposing fungi. The most effective antagonist was L. squarrosulus. Confrontation of R. lignosus with culture filtrates from the antagonistic fungi led to an inhibition of the parasite, the best result being obtained with L. squarrosulus filtrates. Confrontation on Hevea wood blocks revealed that L. squarrosulus was the only test fungus able to invade the zone previously colonized by R. lignosus and to kill the latter; furthermore, it caused significantly greater decay of the test blocks.Extracts of culture filtrates of L. squarrosulus were more active against R. lignosus at acidic pH values with a maximum at pH 5 but retained a significant activity up to pH 10. The antibiotic compound of L. squarrosulus was thermostable and remained active when heated for 15 min at 100 °C.

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