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  Tomato fruit photosynthesis is seemingly unimportant in primary metabolism and ripening but plays a considerable role in seed development

Lytovchenko, A., Eickmeier, I., Pons, C., Osorio, S., Szecowka, M., Lehmberg, K., et al. (2011). Tomato fruit photosynthesis is seemingly unimportant in primary metabolism and ripening but plays a considerable role in seed development. Plant Physiology, 157(4), 1650-1663. doi:10.1104/pp.111.186874.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-2166-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-8397-4
Genre: Journal Article

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Lytovchenko, A.1, Author              
Eickmeier, I.1, Author              
Pons, C.2, Author
Osorio, S.1, Author              
Szecowka, M.1, Author              
Lehmberg, K.1, Author              
Arrivault, S.3, Author              
Tohge, T.1, Author              
Pineda, B.2, Author
Anton, M. T.2, Author
Hedtke, B.2, Author
Lu, Y.4, Author              
Fisahn, J.5, Author              
Bock, R.4, Author              
Stitt, M.3, Author              
Grimm, B.2, Author
Granell, A.2, Author
Fernie, A. R.1, Author              
Affiliations:
1Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              
2External Organizations, ou_persistent22              
3System Regulation, Department Stitt, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753327              
4Organelle Biology and Biotechnology, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753326              
5Biophysical Analysis, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753307              

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 Abstract: Fruit of tomato (Solanum lycopersicum), like those from many species, have been characterized to undergo a shift from partially photosynthetic to truly heterotrophic metabolism. While there is plentiful evidence for functional photosynthesis in young tomato fruit, the rates of carbon assimilation rarely exceed those of carbon dioxide release, raising the question of its role in this tissue. Here, we describe the generation and characterization of lines exhibiting a fruit-specific reduction in the expression of glutamate 1-semialdehyde aminotransferase (GSA). Despite the fact that these plants contained less GSA protein and lowered chlorophyll levels and photosynthetic activity, they were characterized by few other differences. Indeed, they displayed almost no differences in fruit size, weight, or ripening capacity and furthermore displayed few alterations in other primary or intermediary metabolites. Although GSA antisense lines were characterized by significant alterations in the expression of genes associated with photosynthesis, as well as with cell wall and amino acid metabolism, these changes were not manifested at the phenotypic level. One striking feature of the antisense plants was their seed phenotype: the transformants displayed a reduced seed set and altered morphology and metabolism at early stages of fruit development, although these differences did not affect the final seed number or fecundity. Taken together, these results suggest that fruit photosynthesis is, at least under ambient conditions, not necessary for fruit energy metabolism or development but is essential for properly timed seed development and therefore may confer an advantage under conditions of stress.

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Language(s): eng - English
 Dates: 2011-10-062011
 Publication Status: Published in print
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Title: Plant Physiology
  Other : Plant Physiol.
Source Genre: Journal
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Publ. Info: Bethesda, Md. : American Society of Plant Biologists
Pages: - Volume / Issue: 157 (4) Sequence Number: - Start / End Page: 1650 - 1663 Identifier: ISSN: 0032-0889
CoNE: https://pure.mpg.de/cone/journals/resource/991042744294438