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Spot inoculation of Medicago laciniata root by Sinorhizobium meliloti CI-4 or Glomus sp. S043 induces local accumulation of flavonoids

Abstract Medicago laciniata roots were in vitro inoculated with Sinorhizobium meliloti or the arbuscular mycorrhizal fungus Glomus sp. S043. Inocula were applied on well-defined parts of the root system. We studied the chemical response of root cells in presence of the bacteria or the fungus, using visible and fluorescent microscopy. The inoculation spot induced localised accumulation of flavonoids in the root tissue for both Sinorhizobium meliloti and Glomus sp. S043. There was no flavonoid accumulation in other areas of the inoculated root. No tannin accumulation was observed in the roots of the control as well as in the inoculated tissues. The role of these flavonoids is discussed.