Abstract
Several cDNA clones encoding two different ADP-glucose pyrophosphorylase (AGPase, EC 2.7.7.27) polypeptides denoted VfAGPC and VfAGPP were isolated from a cotyledonary library of Vicia faba L. Both sequences are closely related to AGPase small-subunit sequences from other plants. Whereas mRNA levels of VfAGPP were equally high in developing cotyledons and leaves, the mRNA of VfAGPC was present in considerable amounts only in cotyledons. During development of cotyledons, both mRNAs accumulated until the beginning of the desiccation phase and disappeared afterwards. The increase of AGPase activity in cotyledons during the phase of storage-product synthesis was closely followed by the accumulation of starch. The AGPase activity in crude extracts of cotyledons was insensitive to 3-phosphoglycerate whereas the activity from leaves could be activated more than five-fold. Inorganic phosphate inhibited the enzyme from both tissues but was slightly more effective on the leaf enzyme. There was a correlation at the cellular level between the distribution of VfAGPP and VfAGPC mRNAs and the accumulation of starch, as studied by in-situ hybridisation and by histochemical staining in parallel tissue sections of developing seeds, respectively. During the early phase of seed development (12–15 days after fertilization) VfAGPase mRNA and accumulation of starch were detected transiently in the hypodermal, chlorenchymal and outer parenchymal cell layers of the seed coat but not in the embryo. At 25 days after fertilization both synthesis of VfAGPase mRNA and biosynthesis of starch had started in parenchyma cells of the inner adaxial zone of the cotyledons. During later stages, the expression of VfAGPase and synthesis of starch extended over most of the cotyledons but were absent from peripheral cells of the abaxial zone, provascular and procalyptral cells.
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Abbreviations
- AGPase:
-
ADP-glucose pyrophosphorylase
- DAF:
-
days after fertilization
- Glc1P:
-
glucose-1-phosphate
- 3-PGA:
-
3-phosphoglycerate
- VfAGPC:
-
AGPase subunit of Vicia faba mainly expressed in cotyledons
- VfAGPP:
-
AGPase subunit of Vicia faba mainly expressed in leaves and cotyledons
- pVfAGPC, pVfAGPP:
-
plasmids containing VfAGPC and VfAGPP, respectively
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This work was supported by the Bundesministerium für Forschung und Technologie BCT 0389, Molekular- und Zellbiologie von höheren Pflanzen und Pilzen. U.W acknowledges additional support by the Fonds der chemischen Industrie. We thank Elsa Fessel for excellent technical assistance.
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Weber, H., Heim, U., Borisjuk, L. et al. Cell-type specific, coordinate expression of two ADP-glucose pyrophosphorylase genes in relation to starch biosynthesis during seed development of Vicia faba L.. Planta 195, 352–361 (1995). https://doi.org/10.1007/BF00202592
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DOI: https://doi.org/10.1007/BF00202592