Research in Plant Disease 2007;13(1):34-39.
Published online April 30, 2007.
철쭉나무(Rhododendron schlippenbachii)에 대한 엽상 지의류 Dirinaria applanata의 병원성 조사
오순옥, 고영진, 허재선
 
Effects of Lichen Colonization of Dirinaria applanata on the Death of Rhododendron schlippenbachii
Soon Ok Oh, Young Jin Koh, Jae Seoun Hur
Abstract
Lichen thalli of Dirinaria applanata heavily colonized on the twigs of dead or dying Rhododendron trees in Solok island, Jeonnam province in Korea. Pathogenesis of the lichen on the trees was investigated to find out the possibility of lichen as a causal agent. Histological examination of the lichen colonized twigs was attempted with differential staining technique. Lichen-forming fungus colonized only on the surface of bark and there was no direct penetration of fungal hyphae into the plant tissues. Symbiotic algae of the lichen was also examined. The isolated algal cells were inoculated on artificially induced wounds of the healthy trees. Histological examination of the inoculated tissues showed that some algal cells were successfully colonized inside the tissues without any pathogenic symptoms, even 2 months later. The extract of the lichen thalli was also examined using 10% of DMSO solution. Treated tissues showed no pathogenic symptoms, even 4 weeks later. The results suggested that the lichen was not directly involved in the death of the trees.
Key Words: Dirinaria applanata, Lichen-forming fungus, Rhodendron schlippenbachii, Pathogenesis
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