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Thigmomorphogenesis in Solanum lycopersicum: Morphological and biochemical responses in stem after mechanical stimulation

Issam Saidi, Saïda Ammar, Nathalie Demont-CauletSaïda, Johanne Thévenin, Catherine Lapierre, Sadok Bouzid and Lise Jouanin

The activation of the phenylpropanoid pathway in plants by environmental stimuli is one of the most universal biochemical stress responses known. In tomato plant, rubbing applied to a young internode inhibit elongation of the rubbed internode and his neighbouring one. These morphological changes were correlated with an increase in lignification enzyme activities, phenylalanine ammonia-lyase (PAL), cinnamyl alcohol dehydrogenase (CAD) and peroxidases (POD), 24 hours after rubbing of the forth internode. Furthermore, a decrease in indole-3-acetic acid (IAA) content was detected in the rubbed internode and the upper one. Taken together, our results suggest that decrease in rubbed internode length is a consequence of IAA oxidation, increases in enzyme activities (PAL, CAD and POD), and cell wall rigidification associated with induction of lignification process.

Saidi I, Ammar S, Demont-Caulet N, Thévenin J, Lapierre C, Bouzid S, Lise Jouanin L (2009) Thigmomorphogenesis in Solanum lycopersicum: Morphological and biochemical responses in stem after mechanical stimulation. Plant Sci 2009; 177:1-6.

Authors

Issam Saidi Corresponding author: issambenahmed@yahoo.fr

Laboratoire de Physiologie et Biotechnologie Végétales. Département de Biologie. Faculté des Sciences de Tunis. 1060 TUNIS

Saïda Ammar

Laboratoire de Physiologie et Biotechnologie Végétales. Département de Biologie. Faculté des Sciences de Tunis. 1060 TUNIS

Nathalie Demont-CauletSaïda

Institut National de la Recherche Agronomique, Laboratoire de Biologie Cellulaire, IJPB, Versailles Cedex, France

Johanne Thévenin

Institut National de la Recherche Agronomique, Laboratoire de Biologie Cellulaire, IJPB, Versailles Cedex, France

Catherine Lapierre

UMR Chimie Biologique, AgroParisTech/INRA, AgroParisTech, centre de Grignon Thiverval –Grignon, France

Sadok Bouzid

Institut National de la Recherche Agronomique, Laboratoire de Biologie Cellulaire, IJPB, Versailles Cedex, France

Lise Jouanin

Laboratoire de Physiologie et Biotechnologie Végétales. Département de Biologie. Faculté des Sciences de Tunis. 1060 TUNIS