Nod factor inhibition of reactive oxygen efflux in a host legume

From: Plant Physiology | Date: August 1, 2003| Author: | Copyright information

Hydrogen peroxide (H^sub 2^O^sub 2^) efflux was measured from Medicago truncatula root segments exposed to purified Nod factor and to poly-GalUA (PGA) heptamers. Nod factor, at concentrations > 100 pM, reduced H^sub 2^O^sub 2^ efflux rates to 60% of baseline levels beginning 20 to 30 min after exposure, whereas the PGA elicitor, at > 75 nM, caused a rapid increase in H^sub 2^O^sub 2^ efflux to >200% of baseline rates. Pretreatment of plants with Nod factor alters the effect of PGA by limiting the maximum H^sub 2^O^sub 2^ efflux rate to 125% of that observed for untreated plants. Two ...

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