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Plant Physiology 50:531-535 (1972)
© 1972 American Society of Plant Biologists

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Articles

Location of Glycoproteins That Contain Glucosamine in Plant Tissues 1

R. M. Roberts2, J. J. Cetorelli, E. G. Kirby and Mary Ericson

Departments of Biochemistry and Botany, University of Florida, Gainesville, Florida 32601, Department of Biology, University of California, San Diego, La Jolla, California 92037

When radioactive D-glucosamine is provided to Acer pseudoplatanus cells in liquid culture in order to label those glycoproteins that contain amino sugars, it is incorporated predominantly into a crude cell wall fraction. This observation was confirmed histologically by preparing autoradiographs of thin tissue sections from plasmolyzed cells. Highly purified cell wall material from unlabeled cells has also been shown to contain small amounts of glucosamine. Similarly, about one-half of the amino sugar recovered from cultured cells of Nicotiana tabacum is present in their cell walls. In corn roots, however, the labeled glycoproteins that are formed after glucosamine incorporation are predominantly cytoplasmic and not deposited outside the protoplast.

2 To whom reprint requests should be addressed.

1 Supported by National Science Foundation Grants GB 23533 (to R.M.R.) and GB 30235 (to M. J. Chrispeels).






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1972 by the American Society of Plant Biologists