Record ID No. |
415 |
Author(s) |
Catford J.G., Staehelin C., Larose G., Piche Y., Vierheilig H. , 2006 |
Affiliation |
Agricultural University Vienna, Dept Angew Pflanzenwissensch & Pflanzenbiotechnol, Inst Pflanzenschutz, Peter Jordan Str 82, A-1190 Vienna, Austria |
Title |
Systemically suppressed isoflavonoids and their stimulating effects on nodulation and mycorrhization in alfalfa split-root systems |
Source. Vol.(no):Page |
Plant and Soil. 285(1-2):257-266p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biological Interaction |
Sub-subjects |
Nodule forming nitrogen fixers |
Host |
Medicago sativa |
Organism |
Sinorhizobium meliloti, Glomus mosseae |
Country |
Austria, Europe |
Abstracts |
In split-root systems of alfalfa (Medicago sativa L.), already existing nodules or arbuscular mycorrhizal roots suppress further establishment of symbiosis in other root parts, a phenomenon named autoregulation. Roots treated with rhizobial nodulation signals (Nod factors) induce a similar systemic suppression of symbiosis. In order to test the hypothesis that flavonoids play a role in this systemic suppression, split-root systems of alfalfa plants were inoculated on one side of the split-root system with Sinorhizobium meliloti or Glomus mosseae or were treated with Nod factor. HPLC-analysis of alfalfa root extracts from both sides of the split-root system revealed a persistent local and systemic accumulation pattern of some flavonoids associated with the different treatments. The two flavonoids, formononetin and ononin, could be identified to be similarily altered after rhizobial or mycorrhizal inoculation or when treated with Nod factor. Exogenous application of formononetin and ononin partially restored nodulation and mycorrhization pointing towards the involvement of these two secondary compounds in the autoregulation of both symbioses. |