Seasonal changes in content of starch, protein and sugars in the twig wood of salix caprea L.

摘要

The seasonal changes in content of the storage compounds (starch, sugars, and protein) were studied biochemically and electron microscopically in 2-year-old twig wood of Salix caprea L.. Sugar content of the apoplast (= xylem sap) and the symplast (=living cells) of the wood was determined separately. At its maximum, about 25 g of starch, 30g of sugars, and 8 to 10g of protein are found perkg of twig Wood on dry weight basis. Of the protein content about 6g/kg can be attributed to true storage proteins While 2 to 3g/kg are "structural proteins" the living cells.