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Published on October 5, 2007; 10.1104/pp.107.106500

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Received July 31, 2007
Accepted September 25, 2007

Silencing of the mitochondrial ascorbate synthesizing enzyme L-galactono-1,4-lactone dehydrogenase (L-GalLDH) affects plant and fruit development in tomato

Moftah Alhagdow , Fabien Mounet , Louise Gilbert , Adriano Nunes-Nesi , Virginie Garcia , Daniel Just , Johann Petit , Bertrand Beauvoit , Alisdair R. Fernie , Christophe Rothan , and Pierre Baldet *

Institut National de la Recherche Agronomique (INRA); Universite Bordeaux 1; Universite Victor Segalen-Bordeaux 2; Institut Federatif de Recherche 103; Unite Mixte de Recherche 619 sur la Biologie du Fruit; Centre de Recherche INRA de Bordeaux, BP 81, 33883 Villenave d'Ornon Cedex, France

* Corresponding author; email: baldet{at}bordeaux.inra.fr.

L-galactono-1,4-lactone dehydrogenase (L-GalLDH, EC 1.3.2.3) catalyses the last step in the main pathway of vitamin C (L-ascorbic acid) biosynthesis in higher plants. In this study, we first characterized the spatial and temporal expression of SlGalLDH in several organs of tomato (Solanum lycopersicum L.) plants in parallel with the ascorbate content. P35S:SlgalldhRNAi silenced-transgenic tomato lines were then generated using an RNAi strategy, in order to evaluate the effect of any resulting modification of the ascorbate pool on plant and fruit development. In all P35S:SlgalldhRNAi plants with reduced SlGalLDH transcript and activity, plant growth rate was decreased. Plants displaying the most severe effects (dwarf plants with no fruit) were excluded from further analysis. The most affected lines studied exhibited up to an 80% reduction in SlGalLDH activity and showed a strong reduction in leaf and fruit size, mainly as a consequence of reduced cell expansion. This was accompanied by significant changes in mitochondrial function and altered ascorbate redox state despite the fact that the total ascorbate content remained unchanged. By using a combination of transcriptomic and metabolomic approaches, we further demonstrated that several primary, like the TCA cycle, as well as secondary metabolic pathways related to stress response were modified in leaves and fruit of P35S:SlgalldhRNAi plants. When taken together, this work confirms the complexity of ascorbate regulation and its link with plant metabolism. Moreover, it strongly suggests that, in addition to ascorbate synthesis, GalLDH could play an important role in the regulation of cell growth related processes in plants.




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