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Báo cáo lâm nghiệp: "Ultrastructural and biochemical changes at the preinfection stage of mycorrhizal formation by two isolates of Pisolithus tinctorius"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Ultrastructural and biochemical changes at the preinfection stage of mycorrhizal formation by two isolates of Pisolithus tinctorius. | 754s Ann. Sci. For. 1989 46 suppl. 754s-757s Forest Tree Physiology E. Dreyer ef al. eds. Elsevier INRA Ultrastructural and biochemical changes at the preinfection stage of mycorrhizal formation by two isolates of Pisolithus tinctorius F. Lapeyrie1 J. Lei2 N. Malajczuk3 and J. Dexheimer2 1 INRA Centre de Recherches Forestidres de Nancy 54280 Seichamps France 2 Universitd Nancy I Biologie des Ligneux 54500 Vandoeuvre France and 3 CSIRO Division of Forestry and Forest Products Private Bag PO Wembley IVA 6014 Australia Introduction In a previous paper Malajczuk et al. 1989 demonstrated major infection differences existing between isolates of Pisoli-thus tinctorius on roots of Eucalyptus uro-phylla. A strain originally isolated from under Eucalyptus in Australia 445 appeared to be much more aggressive toward this host plant than one isolated from under Pinus in North America 270 despite the fact that ultimately the mycorrhizal infection occurs in both cases. To date there have been no hypotheses to explain ectomycorrhizal specificity and aggressiveness although the action of anti-fungal compounds originating from the plant has been suggested Duchesne et al. 1987 . Information from plant pathology literature has implicated chemical messengers as being responsible for specificity and aggressivity Halverson and Stacey 1986 . Recently there have been a number of publications examining early stages of mycorrhizal infection especially using Eucalyptus as the plant model Malajczuk et al. 1984 Massicotte et al. 1987 Horan et al. 1988 . In all these studies however the very early stages of plant-fungus contact i.e. occurring before the ectomycorrhizal infection sensus stricto have been overlooked. It would seems reasonable to assume that specificity and aggressivity of the infection process is determined and could therefore be characterized during the very early events of plant-fungus interaction as soon as recognition between both symbionts had occurred. Materials and Methods