Systemically suppressed isoflavonoids and their stimulating effects on nodulation and mycorrhization in alfalfa split-root systems

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• 作者：Jean Guy Catford ; Christian Staehelin ; Geneviève Larose ; Yves Piché and Horst Vierheilig
• 关键词：Arbuscular mycorrhiza ; Autoregulation ; Flavonoid ; Medicago sativa ; Nodulation ; Sinorhizobium meliloti
• 刊名：Plant and Soil
• 出版年：2006
• 出版时间：July, 2006
• 年：2006
• 卷：285
• 期：1-2
• 页码：257-266
• 全文大小：254 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

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.