TAILIEUCHUNG - Báo cáo lâm nghiệp: "Variations in growth and virulence of Leptographium wingfieldii Morelet, a fungus associated with the bark beetle Tomicus piniperda L"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Variations in growth and virulence of Leptographium wingfieldii Morelet, a fungus associated with the bark beetle Tomicus piniperda L. | Ann. For. Sci. 61 2004 45-53 INRA EDP Sciences 2004 DOI forest 2003083 45 Original article Variations in growth and virulence of Leptographium wingfieldii Morelet a fungus associated with the bark beetle Tomicus piniperda L. Francois LiEUTiERa b Annie YARTb Hui YEc Daniel SAUVARDb Valérie GALLOiSb a Laboratoire de Biologie des Ligneux et des Grandes Cultures Université d Orléans BP 6749 45067 Orléans France b Unité de Zoologie Forestière INRA avenue de la Pomme de Pin BP 20619 Ardon 45166 Olivet Cedex France c Institute of Ecology and Geobotany Yunnan University Kunming 650091 . China Received 18 December 2001 accepted 17 January 2003 Abstract - Growth and virulence of various isolates of Leptographium wingfieldii Morelet isolated from Tomicus piniperda L. and galleries initiated by this insect on Scots pine Pinus sylvestris L. at different parts of the forest of Orléans were compared. Six isolates were tested in 1994 and 15 in 1995. The tested parameters included the growth on malt agar at different temperatures the ability of the fungus to stimulate the hypersensitive reaction in the phloem and to grow into the reaction zone after isolated inoculations of Scots pine trees as well as fungal virulence to Scots pine after mass inoculations. Significant differences between isolates were observed for all parameters. These differences mainly refer to gradual variations among isolates even though some isolates were constantly opposed to each other for all or most parameters. No obvious effect of the locality from where the isolates had been obtained was detected. The results suggest that the population of L. wingfieldii in the forest of Orléans consists of isolates that possess a high individual variability in growth characteristics and virulence to their host tree. Fungal growth both on malt agar and in the phloem was positively correlated with the length of the reaction zone in the phloem after isolated inoculations and with parameters related to fungal .

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