Plant Physiol. Drug Metab Dispos
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Plant Physiology 77:903-908 (1985)
© 1985 American Society of Plant Biologists

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Articles

Naringin Levels in Citrus Tissues 1

II. Quantitative Distribution of Naringin in Citrus paradisi MacFad

Pablo S. Jourdan2, Cecilia A. McIntosh and Richard L. Mansell

Department of Biology, University of South Florida, Tampa, Florida 33620

The quantitative distribution of the flavanone-7-neohesperidoside, naringin, in seeds, seedlings, young plants, branches, flowers, and fruit of Citrus paradisi Macfad., cv `Duncan' was analyzed by radioimmunoassay. High levels of naringin were associated with very young tissue and lower levels were found in older tissues. Seed coats of ungerminated seeds and young shoots had high naringin concentrations whereas cotyledons and roots had very low concentrations. Light-grown seedlings contained nearly twice as much naringin as etiolated seedlings and, in young plants and branches, the naringin content was highest in developing leaves and stem tissue. In flowers, the ovary had the highest levels of naringin, accounting for nearly 11% of the fresh weight. There was a net increase in the total naringin content of fruits during growth. However, due to the large increase in fruit size, there was a concomitant decrease in the naringin concentration as the fruit matured.

2 Current Address: Department of Plant Breeding and Biometry, 252 Emerson Hall, Cornell University, Ithaca, NY 14853.

1 Supported in part by a United States Department of Agriculture/Science and Education Administration grant to R.L. M.






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Copyright © 1985 by the American Society of Plant Biologists