TAILIEUCHUNG - Báo cáo lâm nghiệp: "Studies (L) virus infection of diseased Quercus robur from forest stands in northern Germany "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Studies (L) virus infection of diseased Quercus robur from forest stands in northern Germany . | 383 Ann Sci For 1996 53 383-388 Elsevier INRA Short note Studies on virus infection of diseased Quercus robur L from forest stands in northern Germany c Bũttner M Fuhrling Universitãt Hamburg Institut fur Angewandte Botanik Abteilung Pflanzenschutz Marseiller str 7 20355 Hamburg Germany Received 1 April 1995 accepted 2 November 1995 Summary Virus-like symptoms such as distinct chlorotic lesions ringspots and chlorotic mottle were observed on leaves of oak trees and seedlings Quercus robur L growing at several forest stands and nurseries in north Germany. The same symptoms were induced on young oak seedlings after grafting. The causing agent was not transmissible by mechanical inoculation of plant sap to indicator plants. Investigations by serological means demonstrated that the agent of virus-like symptoms of oak is not related to tobacco mosaic virus tobacco necrosis virus brome mosaic virus and cherry leafroll virus which have previously been detected in forest trees and soil of other forest ecosystems. Further studies with leaf tissue confirm the detection of double-stranded RNA dsRNA indicated at to kbp in oak with and without symptoms which leads to the hypothesis that the particles belong to the cryptic virus group. Quercus robur L I ringspots I mottle graft-transmissible virus dsRNA Resume Analyse d une infection virale sur Quercus roburịL dans les peuplements du nord de I Allemagne. Des symptômes soupọonnés d etre d originale virale se caractérisant par des lesions chlorotiques distinctes des taches annulaires et des marbrures ont été observes sur des chênes Quercus robur L et sur tears semis dans plusieurs forets et pépinières du nord de I Allemagne. L agent causal a pu être transmis par greffage à de jeunes plants qul ont développé des symptômes caractéristiques de la maladie. Get agent n est pas transmissible par inoculation mécanique de sève à des plantes indicatrices. Les approches sérologiques ont montré que I agent causal de cette mala-die du

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