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A 32-kilodalton vegetative storage protein, found in Salix microstachya Turz. bark during the overwintering period, was purified and characterized using several polyacrylamide gel electrophoretic procedures. Solubility characteristics and amino acid analyses were also performed. The protein is water soluble, is glycosylated, has no disulfide-bonded subunits, but is composed of a family of isoelectric isomers. The majority of these isomers are basic. Characteristic of storage proteins, the protein is rich in glutamine/glutamate and asparagine/aspartate (28%), the basic nature of the isomers indicating that most of these amino acid residues are in the amide form. The protein was purified using preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis and antibodies raised in chickens. Immunoblot analysis suggested an annual cyclic nature of the accumulation and mobilization of this vegetative storage protein. Immunologically, it is related to a similar molecular weight protein found in the bark of Populus deltoides Marsh. but not to any overwintering storage proteins of the other hardwoods tested. Indirect immunolocalization revealed that the protein was sequestered in protein-storage vacuoles in parenchymatous cells of the inner bark tissues of Salix during the winter months.

The 32-Kilodalton Vegetative Storage Protein of Salix microstachya Turz