The effect ofAlectoria sarmentosa,Bryoria fuscescens, andBryoria fremontiiextracts and usnic acid on the growth ofGremmeniella abietinain vitro

摘要

The response of internal and external extracts of fresh arboreal lichens,Alectoria sarmentosa,Bryoria fuscescensandBryoria fremontii, and commercial usnic acid extracted fromUsneaspp. andCladoniaspp. on the growth of the AscomycetousGremmeniella abietinatypes was studied in vitro. Neither internal and external extracts of the three lichen nor usnic acid had strong inhibitive effect on the growth of either type A or B ofG.abietina. A slight stimulative effect due to the extracts was, however, detected: type B (isolate 12) grew faster on almost all media than type A (isolate 11), but great variation within isolates of both types existed suggesting that different types ofG.abietinamay have different responses to chemicals.Keywords:Gremmeniella abietina,Alectoria sarmentosa,Bryoria fuscescens,Bryoria fremontii, usnic acid, lichen toxicity.