Abstract: Sodium chloride stress had a great impact on the growth of rice calli which was reflected by the decrease in survival ratio and relative growth and increase in dry/fresh ratio of the calli with increasing sodium chloide concentrations.No significant differences,however,were found among calli of different genotypes that markedly differed in salt tolerance at the whole plant level,indicating that there is no direct relationship between salt tolerance at the callus level and at whole plant level.Under sodirm chloride stress,the K+content in the calli of the salt tolerance genotypes was lower than that of the salt sensitive genotypes ,but the former had higher Na+and Cl-contents than the latter.This pattern was different from the whole plant level,implying that different mechanisms of ion absorption might be involved at the callus level.