Developmental Transition from Enzymatic to Acid Hydrolysis of Sucrose in Acid Limes (Citrus aurantifolia)

The sucrose breakdown mechanisms in juice sacs of acid lime (Citrus aurantifolia [Christm.] Swing.) were investigated throughout fruit development. All three enzymes of sucrose catabolism (sucrose synthase, acid, and alkaline invertase) are present during the initial stages. The activities of these...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-01, Vol.92 (1), p.168-171
Main Author: Echeverria, Ed
Format: Article
Language:English
Subjects:
Acid hydrolysis
Biological and medical sciences
Body tissues
Developmental biology
Enzymes
Fundamental and applied biological sciences. Psychology
Juices
Metabolism
Metabolism and Enzymology
Organic acids
Photosynthesis, respiration. Anabolism, catabolism
Plant cells
Plant physiology and development
Sugars
Vacuoles
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Summary:The sucrose breakdown mechanisms in juice sacs of acid lime (Citrus aurantifolia [Christm.] Swing.) were investigated throughout fruit development. All three enzymes of sucrose catabolism (sucrose synthase, acid, and alkaline invertase) are present during the initial stages. The activities of these enzymes declined rapidly and disappeared by stage 5 (80% development) but not before vacuolar pH had decreased to approximately 2.5. At this stage, sucrose breakdown occurs by acid hydrolysis. By attaining a vacuolar pH of 2.5 prior to enzyme disappearance, the cell maintains a continuous ability to break down sucrose throughout ontogeny. Thus, acid limes possess a unique and coordinated system for sucrose breakdown that involves both enzymatic and nonenzymatic pathways.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.92.1.168