Plant Physiol.
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Plant Physiology 61:993-999 (1978)
© 1978 American Society of Plant Biologists

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Articles

Purification of Plasma Membranes from Roots of Barley

Specificity of the Phosphotungstic Acid-Chromic Acid Stain 1

Gerald Nagahashi2, Robert T. Leonard and William W. Thomson

Departments of Biology and Plant Sciences, University of California, Riverside, California 92521

Plasma membrane vesicles from roots of barley (Hordeum vulgare L., var. Arivat) had an equilibrium density in sucrose of about 1.16 grams per cubic centimeter, but could not be purified satisfactorily with the procedure developed for roots of other plant species. The reported procedure involving differential centrifugation to remove mitochondria (peak density of 1.18 grams per cubic centimeter) and subsequent density gradient centrifugation to purify plasma membrane vesicles was modified to include a narrower differential centrifugation fraction (13,000 to 40,000g instead of 13,000 to 80,000g) and a narrower density range in the sucrose gradient (1.15 to 1.18 grams per cubic centimeter instead of 1.15 to 1.20 grams per cubic centimeter). The fraction obtained by the modified procedure was between 60 and 70% pure as determined by staining with the phosphotungstic acid-chromic acid procedure, which was judged to be reliable for identifying plasma membrane vesicles in subcellular fractions from barley roots. The plasma membrane fraction was enriched in K+-stimulated ATPase activity at pH 6.5. The presence of nonspecific ATP-hydrolyzing activity in the plasma membrane fraction made it difficult to determine if the ATPase had properties in common with those reported for cation absorption in barley roots.

2 Postdoctoral Research Associate in the Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73069.

1 This work was supported in part by National Science Foundation Grant BMS 74-19987 to W. W. T.






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Copyright © 1978 by the American Society of Plant Biologists