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Biochemical approaches to the study of plant-fungal interactions in arbuscular mycorrhiza

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  • Symbiotic Interactions Between Microorganisms and Plants
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Abstract

This communication compares some biochemical methods for quantifying colonization by arbuscular mycorrhizal (AM) fungi. The degree of mycorrhizal colonization can conveniently be measured by determining fungal specific sterols. AM-colonized plants show a specific synthesis of 24-methylene cholesterol and an enhanced level of campesterol (=24-methyl cholesterol). A gene probe for nitrate reductase, the key enzyme for nitrogen assimilation, has been developed, which allows the monitoring of the distribution of this enzyme in fungi. Among the phytohormones tested, only abscisic acid (ABA) is found at a considerably higher level in AM-colonized plants than in controls. The concentration of ABA is about twenty times higher in spores and hyphae of the AM fungusGlomus than in maize roots. Other phytohormones (auxins, cytokinins) do not show such alterations after mycorrhizal colonization. The roots of gramineous plants become yellow as a result of mycorrhizal colonization. The yellow pigment(s) formed is (are) deposited in larger quantities in the vacuole(s) of the root parenchyma and endodermis cells during the development of the gramineous plants. A substance isolated from such roots has now been identified as a C-14 carotenoid with two carboxylic groups, and named mycorradicin.

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Authors and Affiliations

  1. Botanisches Institut, Universität zu Köln, Gyrhofstr. 15, D-50923, Köln, Germany

    H. Bothe, A. Klingner, M. Kaldorf, O. Schmitz, H. Esch, B. Hundeshagen & H. Kernebeck

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  1. H. Bothe
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  2. A. Klingner
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  3. M. Kaldorf
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  4. O. Schmitz
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  5. H. Esch
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  6. B. Hundeshagen
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  7. H. Kernebeck
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Bothe, H., Klingner, A., Kaldorf, M. et al. Biochemical approaches to the study of plant-fungal interactions in arbuscular mycorrhiza. Experientia 50, 919–925 (1994). https://doi.org/10.1007/BF01923479

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