HETEROSIS FOR SOME CHARECTERIBSTICE OF TOMATO FRUIT (LYCOPERSICON ESCULENTUM MILL).

Six tomato cultivars were used. These cultivars were: (1) Castel Rock (U.S.A) (2) Edkawy (Egypt) (3) Super Marmand (France) (4) Flora-data (U.S.A) (5) B5357 (U.S.A) (6) Fline (France) crossed by using half diallel crosses mating design to obtain 15 crosses. All parent and crosses were evaluated through two seasons 2009and 2010 to evaluate heterosis for some characteristic of tomato. The results showed that, 6F1 hybrids for 15 ones gave no significant with positive values heterosis over the mid-parent for average of fruit weight in the first year. However, 3F1 hybrids for 15 ones gave significant or highly significant with positive values heterosis over the mid-parents in the second year the largest value as a result of hybrid between 3x5 with value (42.3). While the result showed that significant or highly significant with positive values heterosis over the mid-parent for fruit firmness, the largest value (24.1). The combined data over the two years showed that highly significant with positive values heterosis over the mid-parent for average of fruit weight trait ranged from (1.72% to 18.16%) came as a result between (2X3 and 3X5), fruit firmness trait ranged from (3.54% to 19.00%) came as a result between (1X4 and 2X3) respectively, total soluble solids trait ranged from (0.41% to 8.90%) came as a result between (1X4 and 4X6). while heterosis value over the better parents for average of fruit weight ranged from (0.76 to 4.06%) for the crosses (4x6 and 1x4) respectively. Also, fruit firmness ranged from (1.88% to 16.35%) for the crosses (2x4 and 2x3).