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Plant Physiology 43:1372-1374 (1968)
© 1968 American Society of Plant Biologists

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Ion Transport Characteristics of Grape Root Lipids in Relation to Chloride Transport 1

Pieter J. C. Kuiper2

United States Salinity Laboratory, ARS, United States Department of Agriculture, Riverside, California, Soil and Water Conservation Research Division, ARS, United States Department of Agriculture, Riverside, California

Ion transport properties of grape root lipids were measured as liquid-membrane permeability. Phosphatidylcholine exchanged chloride very slowly against carbonate and bicarbonate but more rapidly against nitrate, phosphate, and sulfate. Exchange of chloride against nitrate was rather low for the phosphatidylcholine and phosphatidylethanolamine lipid fractions; monogalactose diglyceride was by far the most effective chloride transporter studied. Comparison between the lipid composition of the roots of the 5 grape rootstocks and the chloride transport capacity of the specific membranes strongly suggests that, indeed, the chloride transport capacity of the lipids present in the membranes of the root cells accounts for the observed differences in chloride transport to the leaves. Whereas monogalactose diglyceride had a high chloride transport capacity, compared with phosphatidylcholine, the reverse was true for exchange of sodium against potassium. Thus, phosphatidylcholine has more the properties of a cation exchanger, and monogalactose diglyceride those of an anion transporter.

2 Plant Physiologist. Present address: Laboratory for Plant Physiological Research, Agricultural University, Wageningen, Holland.

1 Contribution from the United States Salinity Laboratory, Soil and Water Conservation Research Division. ARS, USDA, Riverside, California, in cooperation with the 17 Western States and Hawaii.






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Copyright © 1968 by the American Society of Plant Biologists