Mycorrhiza pp 37-49 | Cite as

Trends in Molecular Studies of AM Fungi

  • P. Franken


Arbuscular mycorrhizal (AM) fungi grouped in the order Glomales (Morton and Benny 1990) interact with the roots of most land plants in nearly all ecosystems (Newman and Reddel 1987). During their development, they display particular structures like the arbuscules that are involved in different functions of the symbiosis (Smith and Gianinazzi-Pearson 1988; Read, this Vol.). Their life cycle is vegetative, and sexual stages have not been defined. The hyphae of AM fungi, like those of other Zygomycetes, are aseptated and so they are multinucleated organisms (Bonfante et al. 1987; Cooke et al. 1987). Predominantly in their spores, nuclei accumulate to rather high numbers (Viera and Glenn 1990). For these nuclei, a DNA content of 0.2 to 1 pg/ nucleus was calculated (Bianciotto and Bonfante 1992). Assuming haploidy, this indicates a genome size of 108 to 109 nucleotides, 50 to 100 times more than in other fungi. Their important role as symbionts in nearly all ecosystems (Read et al. 1992) and their peculiar development implicate the use of AM fungi in basic research (Franken et al. 1996) and sustainable agriculture (Gianinazzi et al. 1995). Their analysis and application is, however, hampered by their obligate biotrophic nature, but recently, modern techniques are allowing molecular approaches to be followed for the investigation of AM fungi.


Arbuscular Mycorrhizal Fungus Arbuscular Mycorrhizal Arbuscular Mycorrhiza Mycorrhizal Root Arbuscular Mycorrhizal Fungal Community 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • P. Franken
    • 1
  1. 1.Max-Planck-Institut für terrestrische Mikrobiologie, Abt. Biochemie and Laboratorium für Mikrobiologie, Fachbereich BiologiePhilipps-UniversitätMarburgGermany

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