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Lipids in Grape Roots in Relation to Chloride Transport ¹

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

A comparison was made between the lipids of the roots of 5 grape rootstocks which differ markedly in the extent to which they permit chloride accumulation in leaves. Monogalactose diglyceride concentration was directly related to chloride accumulation in the leaves of the 5 rootstocks. Phosphatidylcholine and phosphatidylethanolamine were inversely related to chloride accumulation. The variety with the highest chloride accumulation contained an unusually small amount of sterols. A striking negative correlation between content of lignoceric acid and chloride accumulation was observed. The lignoceric acid concentration ranged from 11.9% in the rootstock with the lowest chloride accumulation to 0.8% in the rootstock with the highest chloride accumulation. This fatty acid was found mainly in the phosphatidylcholine and the phosphatidylethanolamine lipid fractions.

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.