Record ID No. |
1242 |
Author(s) |
Buscot,F. , Herrmann,S , 2004 |
Affiliation |
Institute of Botany, Department of Terrestrial Ecology, Johannisallee 21-23, D-04103 Leipzig, Germany. |
Title |
At the frontier between Basidiomycotes and plants: reciprocal interactions between mycorrhiza formation and root development in an in vitro system with oaks and Hymenomycetes |
Source. Vol.(no):Page |
Frontiers-in-Basidiomycote-mycology. 361-376p. |
Categories |
Ectomycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Tissue Culture |
Host |
Quercus robur |
Organism |
Paxillus involutus, Laccaria amethystea, Hebeloma crustuliniforme, Pisolithus tinctorius and L. laccata, Hymenomycetes (Basidiomycota) |
Country |
Germany, Europe |
Abstracts |
The relation between mycorrhization dynamics and elongation of the lateral root system was compared in an in vitro system with oak (Quercus robur) microcuttings between five ectomycorrhizal basidiomycetes (Paxillus involutus, Laccaria amethystea, Hebeloma crustuliniforme, Pisolithus tinctorius and L. laccata). The experiment allowed the recognition of two schemes of mycorrhization depending on whether the endogene rhythmic growth, characteristic for oaks, is involved. Additional experiments with one representative mycobiont of each scheme showed a diversity of mycorrhization patterns. This might be explained by competition between the fungus and the roots for plant resources and that their variations are related to rhythmic growth cycles of the oak. Based on this interpretation, we propose to integrate the classical carbon and hormone theories in a common hypothesis that considers the formation of ectomycorrhizas by a wide diversity of Ascomycota and especially of Hymenomycetes (Basidiomycota) as a result of a fine tuning between a few mechanisms, i.e., the individual carbon demand of each fungus, the production levels of growth promoting factors by the fungus and by the plant, and the rhythmic growth. Rhythmic plant growth has never been considered in mycorrhizal research so far. The application of molecular tools should allow assessment of the hypothesis in future. |