Both authors contributed equally to this work.
A root-knot nematode-secreted protein is injected into giant cells and targeted to the nuclei
Article first published online: 27 APR 2012
© 2012 INRA. New Phytologist © 2012 New Phytologist Trust
Volume 194, Issue 4, pages 924–931, June 2012
How to Cite
Jaouannet, M., Perfus-Barbeoch, L., Deleury, E., Magliano, M., Engler, G., Vieira, P., Danchin, E. G. J., Rocha, M. D., Coquillard, P., Abad, P. and Rosso, M.-N. (2012), A root-knot nematode-secreted protein is injected into giant cells and targeted to the nuclei. New Phytologist, 194: 924–931. doi: 10.1111/j.1469-8137.2012.04164.x
- Issue published online: 2 MAY 2012
- Article first published online: 27 APR 2012
- Received: 16 March 2012, Accepted: 24 March 2012
- comparative genomics;
- giant cell;
- •Root-knot nematodes (RKNs) are obligate endoparasites that maintain a biotrophic relationship with their hosts over a period of several weeks and induce the differentiation of root cells into specialized feeding cells. Nematode effectors synthesized in the oesophageal glands and injected into the plant tissue through the syringe-like stylet certainly play a central role in these processes.
- •In a search for nematode effectors, we used comparative genomics on expressed sequence tag (EST) datasets to identify Meloidogyne incognita genes encoding proteins potentially secreted upon the early steps of infection.
- •We identified three genes specifically expressed in the oesophageal glands of parasitic juveniles that encode predicted secreted proteins. One of these genes, Mi-EFF1 is a pioneer gene that has no similarity in databases and a predicted nuclear localization signal. We demonstrate that RKNs secrete Mi-EFF1 within the feeding site and show Mi-EFF1 targeting to the nuclei of the feeding cells.
- •RKNs were previously shown to secrete proteins in the apoplasm of infected tissues. Our results show that nematodes sedentarily established at the feeding site also deliver proteins within plant cells through their stylet. The protein Mi-EFF1 injected within the feeding cells is targeted at the nuclei where it may manipulate nuclear functions of the host cell.