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. 1996 Dec;112(4):1523–1530. doi: 10.1104/pp.112.4.1523

Regulation of the Expression of the Glycine Decarboxylase Complex during Pea Leaf Development.

P Vauclare 1, N Diallo 1, J Bourguignon 1, D Macherel 1, R Douce 1
PMCID: PMC158085  PMID: 12226462

Abstract

The expression of the genes encoding the four proteins (P, H, T, and L) of glycine decarboxylase, a multienzymatic complex involved in the mitochondrial step of the photorespiration pathway, was examined during pea (Pisum sativum) leaf development in comparison with ribulose-1,5-bisphosphate carboxylase/oxygenase. Mitochondria from the primary leaf were isolated at several well-defined stages of development. Their capacity to oxidize glycine was negligible during the earlier stages but increased dramatically once the leaflet opened. This was correlated with the accumulation of the glycine decarboxylase complex (GDC) proteins, which was shown to occur in preexisting mitochondria, producing an increase in their density. The transcription of the GDC genes was coordinated and occurred early, with a peak at 7 d, a stage at which mitochondria are unable to oxidize glycine. This implies the existence of posttranscriptional control of gene expression. The comparison of the expression patterns of the genes encoding specific proteins of GDC with that of rbcS genes suggests a common regulation scheme that is related to light induction. However, ribulose-1,5-bisphosphate carboxylase/oxygenase is present in the chloroplast well before GDC fills the mitochondria, suggesting that the setup of photorespiration occurs in cells already engaged in active photosynthesis.

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Selected References

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