Abstract: The compositions and the translocation characters of Cassimilates at theshootgrowing stage in potcultured young Liao Fu'apple trees were studied during 1986-1987.The results have shown that the major compositions of assimilates in appleleaves are sugar,sorbitol content is the maximum,sucrose the second,glucose and fructoseonly a little.The amino acids synthesized in leaves are mainly aspartic acid,serine alanineand asparagine.The export rate of sorbitol out of leaves is higher tnan that of sucrose.Sorbitol is dominant in shortdistance transport from the natured leaves up to the developingparts,but sucrose is mainly transported in long distance to other organs.At the shootgrowing stage of young apple trees,carbon assimilates can finish the leafroottop cyclewithin 24 hours.Parts of sugar imported in roots are transformed into organic acids andamino acids,for example asparagine,glutamine and aspartic acid,then translocated back tothe top of tree.The distribution of the substance among the top parts is strictly regulated bymetabolism.

Key words: Young apple tree, 14C, Metabolism, Cycle, Shoot

CLC Number: 

• S661.1