Sucrose Synthase and Invertase in Isolated Vascular Bundles

Vascular bundles were isolated from grapefruit (Citrus paradisi Macf.) during periods of rapid sucrose translocation into fruit. Invertase and sucrose synthase activities were assayed in these strands and compared with immediately adjacent tissues (inner most peel and segment epidermis) and phloem-f...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1991-11, Vol.97 (3), p.1249-1252
Main Authors: Tomlinson, Patricia T., Duke, Edwin R., Nolte, Kurt D., Koch, Karen E.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Albedo
Biological and medical sciences
Communications
Corn
Enzymes
Epidermis
Fundamental and applied biological sciences. Psychology
Juices
Metabolism
Phloem
Photosynthesis, respiration. Anabolism, catabolism
Plant physiology and development
Plant tissues
Plants
Vascular bundles
Vascular tissues
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Summary:Vascular bundles were isolated from grapefruit (Citrus paradisi Macf.) during periods of rapid sucrose translocation into fruit. Invertase and sucrose synthase activities were assayed in these strands and compared with immediately adjacent tissues (inner most peel and segment epidermis) and phloem-free juice sacs during four growing seasons. Although sucrose synthase was present in sink cells, the significantly greater activity in vascular strands (per unit fresh weight and protein) indicated that the role of this enzyme in translocation may include a vascular function in addition to its proposed involvement in metabolism of importing cells.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.97.3.1249