Abstract: Using Kagemusya (Lycopersicon esculentum Mill. ) , a salt tolerant cultivar, as rootstock and
Baoda 903 as scion, grafting was made to compare the differences in plant growth and contents of different
forms ( free, conjugated and bound) of polyamines between grafted and own-rooted tomato seedlings under 100
mmol·L^-1 NaCl stress for 10 days. The results showed that the biomass production in grafted seedlings was
significantly higher than that of own-rooted seedlings. The contents of three forms of putrescine ( Put) and
spermine ( Spm) in roots of grafted seedlings increased significantly duringNaCl treatment, while the contents
of three forms of spermidine ( Spd) decreased continuously. The contents of free and conjugated Spm in roots
of own2rooted seedlings reached the highest value on the 6 th day of treatment and then decreased slowly. No
significant difference was observed in bound Spm. The contents of three forms of Put and Spd decreased signif
icantly duringNaCl treatment. These results indicated that the Put and Spd p layed important roles in the roots
of grafted tomato seedlings for salt tolerance.

Key words: Tomato, NaCl stress, Grafting, Polyamines