No evidence for allelopathic effects of arbuscular mycorrhizal fungi on the non-host plant Stellaria media
Autor: | Keya Howard, Rita S. L. Veiga, Marcel G. A. van der Heijden |
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Rok vydání: | 2012 |
Předmět: |
0106 biological sciences
biology Host (biology) fungi food and beverages Soil Science Plant physiology Plant Science 15. Life on land biology.organism_classification 010603 evolutionary biology 01 natural sciences food.food Glomeromycota food Symbiosis Agronomy Stellaria media Botany Mycorrhiza Weed Allelopathy 010606 plant biology & botany |
Zdroj: | Plant and Soil |
ISSN: | 1573-5036 0032-079X |
Popis: | The arbuscular mycorrhizal (AM) symbiosis is widespread throughout the plant kingdom and important for plant nutrition and ecosystem functioning. Nonetheless most terrestrial ecosystems also contain a considerable number of non mycorrhizal plants. The interaction of such non host plants with AM fungi (AMF) is still poorly understood. Here in three complementary experiments we investigated whether the non mycorrhizal plant Arabidopsis thaliana the model organism for plant molecular biology and genetics interacts with AMF. We grew A.?thaliana alone or together with a mycorrhizal host species (either Trifolium pratense or Lolium multiflorum) in the presence or absence of the AMF Rhizophagus irregularis. Plants were grown in a dual compartment system with a hyphal mesh separating roots of A.?thaliana from roots of the host species avoiding direct root competition. The host plants in the system ensured the presence of an active AM fungal network. AM fungal networks caused growth depressions in A.?thaliana of more than 50 which were not observed in the absence of host plants. Microscopy analyses revealed that R.?irregularis supported by a host plant was capable of infecting A.?thaliana root tissues (up to 43 of root length colonized) but no arbuscules were observed. The results reveal high susceptibility of A.?thaliana to R.?irregularis suggesting that A.?thaliana is a suitable model plant to study non host/AMF interactions and the biological basis of AM incompatibility. |
Databáze: | OpenAIRE |
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