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Metabolism of sugars and organic acids in immature grape berries.

Authors
  • Hardy, P J
Type
Published Article
Journal
PLANT PHYSIOLOGY
Publisher
American Society of Plant Biologists
Publication Date
Feb 01, 1968
Volume
43
Issue
2
Pages
224–228
Identifiers
PMID: 16656755
Source
Medline
License
Unknown

Abstract

Individual intact excised immature Sultana berries were supplied through the cut pedicel with (14)C-sugars and organic acids. When (14)C-hexoses were supplied malic and tartaric acids accounted for 25% and 10% of the total activity extracted after 24 hours, and sucrose was synthesized. It is proposed that the changes in the levels of organic acids during ripening are related to changes in the ability of the berry to synthesize them. Although administration of uniformly labeled sucrose resulted in the unequal labeling of glucose and fructose, the results indicate breakdown of sucrose by invertase. It is suggested that the route of entry of the pedicel-fed sugars into the berry may be different from the route taken by sugar translocated from the leaf.

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