Enzymatic studies on the metabolism of vesicular-arbuscular mycorrhizas. IV. Ultracytoenzymological evidence (ATPase) for active transfer processes in the host-arbuscule interface

The ultrastructural localization of ATPase activities was identical in onion and sycamore mycorrhizas. DES-sensitive ATPase activity was associated with the fungal plasmalemma and paramural bodies whilst a DES-insensitive ATPase activity was detected within the fungal vacuole. The development of the...

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Bibliographic Details
Published in:The New phytologist 1982, Vol.90 (1), p.37-43
Main Authors: Marx, C, Dexheimer, J, Gianinazzi-Pearson, V, Gianinazzi, S
Format: Article
Language:English
Subjects:
Adenosine triphosphatases
adenosinetriphosphatase
Cell membranes
Fungi
Hyphae
Life Sciences
Mycorrhizas
Phosphates
Phytopathology and phytopharmacy
Plant cells
Plant roots
Tinkers
Vacuoles
Vegetal Biology
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Summary:The ultrastructural localization of ATPase activities was identical in onion and sycamore mycorrhizas. DES-sensitive ATPase activity was associated with the fungal plasmalemma and paramural bodies whilst a DES-insensitive ATPase activity was detected within the fungal vacuole. The development of the mycorrhizal fungus within root cells modified the distribution of DES-sensitive plasmalemma-bound ATPase activity of the host. This became concentrated around the finer arbuscule branches and appeared to be a specialization of the invaginated host membrane which occurred when arbuscule structure was favourable for nutrient exchange. These observations strengthen the hypothesis that nutrient exchange in VA mycorrhizas must occur across the living host-fungus interface and that phosphate is transferred from fungus to host by an active transport mechanism in the finer branches of the arbuscule.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1982.tb03238.x