Fructose and glucose contents in Micro-Tom fruit had significant positive correlations with invertase (AI and NI) activities with the correlation coefficients of 0.875* , 0.907* and 0.889*, 0.878*, respectively (Table 1). Likewise, in S. chmielewskii fruit that positive correlations were found between the contents of fructose, glucose and the activity of invertase (AI and NI). And sucrose content in S. chmielewskii fruit was correlated significantly positive with sucrose phosphate synthase (SPS), the correlation coefficient was 0.985*