Journal Article

Morphological Responses and Molecular Modifications in Tomato Plants after Mechanical Stimulation

Nathalie Depege, Catherine Thonat, Catherine Coutand, Jean-Louis Julien and Nicole Boyer

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 10, pages 1127-1134
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029097
Morphological Responses and Molecular Modifications in Tomato Plants after Mechanical Stimulation

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Study of the growth responses of Lycopersicon escu-lentum (Mill. cv. VFN8) to mechanical stimulation applied to a single young internode showed a rapid and sharp decrease in stem elongation and an inhibition of elongation of several internodes, indicative of information transmission in the plant. A new tomato cDNA partial clone encoding calmodulin was isolated and used to study the time course of the gene induction in response to the rubbing treatment. Northern blot analysis showed a maximum accumulation of calmodulin mRNA 2 h after mechanical stimulation, not only in the rubbed internode, but also in upper and lower internodes and in young leaves. Treatment of the plant with calcium and EGTA showed the involvement of calcium and, in particular, intracellular calcium in calmodulin gene expression and cellular response.

Keywords: Calcium; Calmodulin; Growth inhibition; Lycopersicon esculentum; Signal transduction

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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