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Ophiostomatoid fungi (Ascomycota) associated with Pinus tabuliformis infested by Dendroctonus valens (Coleoptera) in northern China and an assessment of their pathogenicity on mature trees

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Lu, Quan Decock, Cony [UCL] Zhang, Xing Yao Maraite, Henri [UCL]

Dendroctonus valens is an invasive pest in coniferous forests of northern China. It was suspected of being responsible for the death of more than three million Pinus tabuliformis trees. The present study sought to identify the ophiostomatoid fungi associated with D. valens in northern China and understand the possible role of these fungi in the pine decline. On the basis of morphology, physiology, mating compatibility and phylogenetic analyses of multiple DNA sequences, seven species of ophiostomatoid fungi were isolated from and around D. valens galleries: Leptographium alethinum, Grosmannia koreana (teleomorph of L. koreanum), L. procerum, L. sinoprocerum, L. truncatum, Pesotum aureum and P. pini. All have been recorded for the first time in China. Among them, the occurrence of the dominant species L. procerum is positively linked to attack intensities of D. valens. The pathogenicity of four species (L. koreanum, L. procerum, L. sinoprocerum and L. truncatum) was tested on mature P. tabuliformis trees by stem inoculation. All inoculated strains caused significant necrotic lesions on the inner bark. However, L. koreanum and L. truncatum induced more extensive lesions than L. procerum and L. sinoprocerum. Their association with D. valens and the P. tabuliformis decline is discussed.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2009
Language Anglais
Journal information "Antonie van Leeuwenhoek : international journal of general and molecular microbiology" - Vol. 96, no. 3, p. 275-293 (2009)
Peer reviewed yes
Publisher Springer (Dordrecht)
issn 0003-6072
e-issn 1572-9699
Publication status Publié
Affiliation UCL - AGRO/CABI - Département de chimie appliquée et des bio-industries
Keywords Leptographium ; Pathogenicity ; Pesotum ; Phylogeny ; beta-Tubulin
Links
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Bibliographic reference Lu, Quan ; Decock, Cony ; Zhang, Xing Yao ; Maraite, Henri. Ophiostomatoid fungi (Ascomycota) associated with Pinus tabuliformis infested by Dendroctonus valens (Coleoptera) in northern China and an assessment of their pathogenicity on mature trees. In: Antonie van Leeuwenhoek : international journal of general and molecular microbiology, Vol. 96, no. 3, p. 275-293 (2009)
Permanent URL http://hdl.handle.net/2078.1/35371