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Sucrose-to-starch metabolism in tomato fruit undergoing transient starch accumulation
Year:
1997
Source of publication :
Plant physiology (source)
Authors :
Petreikov, Marina
;
.
Schaffer, Arthur
;
.
Volume :
113
Co-Authors:
Schaffer, A.A., Department of Vegetable Crops, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Petreikov, M., Department of Vegetable Crops, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
739
To page:
746
(
Total pages:
8
)
Abstract:
Immature green tomato (Lycopersicon esculentum) fruits undergo a period of transient starch accumulation characterized by developmental changes in the activities of key enzymes in the sucrose (Suc)-to-starch metabolic pathway. Activities of Suc synthase, fructokinase, ADP-glucose (Glc) pyrophosphorylase, and soluble and insoluble starch synthases decline dramatically in parallel to the decrease in starch levels in the developing fruit. Comparison of 'maximal' in vitro activities of the enzymes in the Suc-to-starch pathway suggests that these same enzymes are limiting to the rate of starch accumulation. In contrast, activities of invertase, UDP-Glc pyrophosphorylase, nucleoside diphosphate kinase, phosphoglucoisomerase, and phosphoglucomutase do not exhibit dramatic decreases in activity and appear to be in excess of starch accumulation rates. Starch accumulation is spatially localized in the inner and radial pericarp and columella, whereas the outer pericarp and seed locule contain little starch. The seed locule is characterized by lower activities of Suc synthase, UDP-Glc pyrophosphorylase, phosphoglucomutase, ADP-Glc pyrophosphorylase, and soluble and insoluble starch synthases. The outer pericarp exhibits comparatively lower activities of ADP-Glc pyrophosphorylase and insoluble starch synthase only. These data are discussed in terms of the developmental and tissue-specific coordinated control of Suc-to-starch metabolism.
Note:
Related Files :
carbohydrates
Lycopersicon esculentum
metabolism
Solanum lycopersicum
Starch
sucrose
tomato
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Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
27899
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:35
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Scientific Publication
Sucrose-to-starch metabolism in tomato fruit undergoing transient starch accumulation
113
Schaffer, A.A., Department of Vegetable Crops, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Petreikov, M., Department of Vegetable Crops, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Sucrose-to-starch metabolism in tomato fruit undergoing transient starch accumulation
Immature green tomato (Lycopersicon esculentum) fruits undergo a period of transient starch accumulation characterized by developmental changes in the activities of key enzymes in the sucrose (Suc)-to-starch metabolic pathway. Activities of Suc synthase, fructokinase, ADP-glucose (Glc) pyrophosphorylase, and soluble and insoluble starch synthases decline dramatically in parallel to the decrease in starch levels in the developing fruit. Comparison of 'maximal' in vitro activities of the enzymes in the Suc-to-starch pathway suggests that these same enzymes are limiting to the rate of starch accumulation. In contrast, activities of invertase, UDP-Glc pyrophosphorylase, nucleoside diphosphate kinase, phosphoglucoisomerase, and phosphoglucomutase do not exhibit dramatic decreases in activity and appear to be in excess of starch accumulation rates. Starch accumulation is spatially localized in the inner and radial pericarp and columella, whereas the outer pericarp and seed locule contain little starch. The seed locule is characterized by lower activities of Suc synthase, UDP-Glc pyrophosphorylase, phosphoglucomutase, ADP-Glc pyrophosphorylase, and soluble and insoluble starch synthases. The outer pericarp exhibits comparatively lower activities of ADP-Glc pyrophosphorylase and insoluble starch synthase only. These data are discussed in terms of the developmental and tissue-specific coordinated control of Suc-to-starch metabolism.
Scientific Publication
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