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Research Paper

A diffusible signal from germinating Orobanche ramosa elicits early defense responses in suspension-cultured Arabidopsis thaliana

Hayat El-Maarouf-Bouteau, Elisabeth Moreau, Rafik Errakhi and Georges Sallé

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In plant/parasitic plant interaction, little is known about the host plant response before the establishment of the parasite within the host. In the present work, we focused on host responses to parasitic plant, O. ramosa in the early stage of infection. We used a co-culture system of A. thaliana suspension cells and O. ramosa germinated-seeds to avoid parasite attachment. We showed that O. ramosa induced H₂O₂ generation and camalexin synthesis by A. thaliana followed by a drastic increase in cell death. We further demonstrated that a heat sensitive diffusible signal is responsible for this cell death. These data indicate that recognition of O. ramosa occurs before the attachment of the parasite and initiates plant defence responses.

Authors

Hayat El-Maarouf-Bouteau

Laboratoire de Parasitologie Végétale (EA3495); Ivry sur Seine, France

Elisabeth Moreau

Laboratoire de Parasitologie Végétale (EA3495); Ivry sur Seine, France

Rafik Errakhi

LEM, EA3514; Université Paris Diderot (Paris 7); Paris, France

Georges Sallé

Laboratoire de Parasitologie Végétale (EA3495); Ivry sur Seine, France

Purchase article for $19

Subscribe to this journal for $79/year