TAILIEUCHUNG - Báo cáo lâm nghiệp: "Amplification of root—fungus interface in ectomycorrhizae by Hartig net architecture"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Amplification of root—fungus interface in ectomycorrhizae by Hartig net architecture. | Ann. Sci. For. 1989 46 suppl. 737s-740s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA 3 s Amplification of root-fungus interface in ectomycorrhizae by Hartig net architecture I. Kottke and F. Oberwinkler Universităt Tubingen Institut fur Botanik Spezielle Botanik und Mykologie Tubingen . Introduction In previous investigations it was found that the Hartig net is formed quite similarly in ectomycorrhizae of different fungal species with diverse trees despite characteristic differences in mantle structure Mangin 1910 Blasius et al. 1986 Kottke and Oberwinkler 1986 Haug 1987 . The question arose whether there was any functional benefit for the development of the observed Hartig net architecture imposing evolutionary pressure to equalize the development in different mycorrhizal types. Transmission electron microscopy studies revealed that the scarce septation and the intimate juxtaposition of the hyphae result in a transfer cell-like structure of the Hartig net amplifying the intersymbiont surface Fig. 1 Kottke and Oberwinkler 1987 . Hyphae do not penetrate separately but as a lobed front between the cortical cells. The tips of the fan-like branched hyphal system are characterized by a large number of mitochondria and high amounts of rough endoplasmic reticulum. Cytoplasm in this region contains many ribosomes and lacks large vacuoles. The hind parts of the hyphae become dilated but remain in close contact with the surface of the cortical cells. These characteristics can be found when the Hartig net is in an active state. The bidirectional active exchange of solutes between fungus and root is underlined by the results obtained from cytochemical proof of ATPase activities at this stage Lei and Dexheimer 1988 . In ageing mycorrhizae cortical cells are the first to die and their active uptake of solutes is no longer possible. At this stage hyphae of the Hartig net can Fig. 1. Characteristics of Hartig net hyphae loner front frequently branched scarcely .

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