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Manfred Kluge Manfred Kluge (e-mail: Kluge@bio.tu-darmstadt. de), Institut fur Botanik ¨ der Technischen Universitat Darmstadt, ¨ Schnittspahnstrasse 10, D-64287 Darmstadt, Germany. INTRODUCTION This article reports on the Geosiphon pyriformisâ Nostoc association, up to now the only known example of an endosymbiosis between a fungus a cyanobacterium, Nostoc punctiforme. Included is a general description of the symbiotic system, the taxonomic position of the partners, the initiation life history of the symbiosis, the structure of the consortium, the metabolic aspects of the symbiosis the partner relationships. WHAT IS GEOSIPHON? Geosiphon pyriformis (Kutz.) von Wettstein is a ¨ coenocytic soil fungus that lives in endocytobiotic association with a cyanobacterium, Nostoc punctiforme. At the tip of the hyphae the fungus forms unicellular âbladdersâ up to 2mm long 5mm in diameter (Pl. I), where the cyanobacterial cells are located where they differentiate become physiologically active. Thus, Geosiphon represents an example of an endocyanosis. An arable site near Bibergemund (Spessart Mountains, Germany) is at ¨ present the only known site worldwide where Geosiphon is naturally abundant. Some particularly interesting features of Geosiphon pyriformis will be described brieï¬y in this paper; for more details, see the reviews by Kluge et al. (1997) SchuÃler ¨ Kluge
Biology and Environment: Proceedings of the Royal Irish Academy – Royal Irish Academy
Published: Jan 1, 2002
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