Plant Physiology Preview
Published on September 23, 2005; 10.1104/pp.105.063719
Received April 8, 2005
Returned for revision July 13, 2005
Accepted July 26, 2005
Changes in Transcriptional Profiles Are Associated with Early Fruit Tissue Specialization in Tomato
Martine Lemaire-Chamley , Johann Petit , Virginie Garcia , Daniel Just , Pierre Baldet , Véronique Germain , Mathilde Fagard , Mariam Mouassite , Catherine Cheniclet , and Christophe Rothan *
Unité Mixte de Recherche 619, Physiologie et Biotechnologie Végétales, Institut de Biologie Végétale Intégrative, Institut National de la Recherche Agronomique, Universités Bordeaux 1 et Victor Segalen Bordeaux 2, Centre de Recherche de Bordeaux, 33883 Villenave d'Ornon cedex, France
* Corresponding author; email: rothan{at}bordeaux.inra.fr.
The cell expansion phase contributes in determining the major characteristics of a fleshy fruit and represents two-thirds of the total fruit development in tomato (Solanum lycopersicum). So far, it has received very little attention. To evaluate the interest of a genomic scale approach, we performed an initial sequencing of approximately 1,200 cell expansion stage-related sequence tags from tomato fruit at 8, 12, and 15 d post anthesis. Interestingly, up to approximately 35% of the expressed sequence tags showed no homology with available tomato expressed sequence tags and up to approximately 21% with any known gene. Microarrays spotted with expansion phase-related cDNAs and other fruit cDNAs involved in various developmental processes were used (1) to profile gene expression in developing fruit and other plant organs and (2) to compare two growing fruit tissues engaged mostly in cell division (exocarp) or in cell expansion (locular tissue surrounding the seeds). Reverse transcription-polymerase chain reaction analysis was further used to confirm microarray results and to specify expression profiles of selected genes (24) in various tissues from expanding fruit. The wide range of genes expressed in the exocarp is consistent with a protective function and with a high metabolic activity of this tissue. In addition, our data show that the expansion of locular cells is concomitant with the expression of genes controlling water flow, organic acid synthesis, sugar storage, and photosynthesis and suggest that hormones (auxin and gibberellin) regulate this process. The data presented provide a basis for tissue-specific analyses of gene function in growing tomato fruit.
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