The two-year-old scion from Satsuma mandarine (Citrus unshiu Marc. cv. Guoqing No.4) was grafted onto 5 kinds of rootstocks: Poncirus trifoliata (I) for control, two somatic hybrids of C. reticulata with P. trifoliata (II) and with C. jambhiri (III), and two sexual hybrids C. sinensis × P. trifoliata (IV), C. maxima × P. trifoliata (V). The experiments showed that the trees growing from all the four kinds of rootstocks were vigorous compared to the control. Treatment II had more flowers than the control，but the treatment III，IV and V less．Highest content of photosynthetic pigments was observed in treatm ent IV and lowest in the control． Diferent treatm ents obviously influenced the tendency of the annual changes in the contents of soluble sugar and starch in leaves．The contents of soluble sugar and starch in leaves in different treatments changed obviously in various periods． The use value of somatic hybrids as a rootstock is discussed．
