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JXB Advance Access published online on July 10, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl044
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received January 17, 2006
Accepted May 5, 2006

RESEARCH PAPER

Nematode infection and reproduction in transgenic and mutant Arabidopsis and tobacco with an altered phenylpropanoid metabolism

N. Wuyts 1, G. Lognay 2, R. Swennen 1, and D. De Waele 1 *

1 Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, Catholic University of Leuven (K.U. Leuven), Kasteelpark Arenberg 13, 3001 Leuven, Belgium
2 Unité de Chimie Analytique, Faculté Universitaire des Sciences Agronomiques de Gembloux, Passage des Déportés 2, 5030 Gembloux, Belgium

* To whom correspondence should be addressed.
D. De Waele, E-mail: dirk.dewaele{at}biw.kuleuven.be


  Abstract

Transgenic and mutant Arabidopsis and tobacco plants with altered phenylpropanoid metabolism were infected with the plant parasitic root knot nematode Meloidogyne incognita to assess the effect of the transgene or mutation on nematode infection and reproduction. Modifications in the lignin biosynthetic pathway which alter lignin composition in roots affected reproduction. In Arabidopsis with increased levels of syringyl lignin, reproduction was lower than in wild-type plants, while in tobacco with reduced levels of syringyl lignin, life cycle progression was stimulated. Overexpression of a MYB transcription factor of phenylpropanoid metabolism in tobacco significantly stimulated reproduction of M. incognita, while overexpression of L-phenylalanine ammonia-lyase had no effect. Arabidopsis transparent testa mutants with deficiencies in flavonoid pathway enzymes did not affect reproduction of M. incognita in the present infection tests.

Keywords: Chlorogenic acid; flavonoid; guaiacyl lignin; Meloidogyne incognita; syringyl lignin; transparent testa mutants.
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