The (5.) of seven tomato cultivars Le. Prichard, Cal Rock; Beto 98; Ace 55
V.F; Floradade; Super strain B and Money Maker and their hybrids without reciprocals
were used in this investigation to determine the heterotic performance on some
histological leaflets; electrophoretic, and agronomic traits. Most of the hybrids showed
positive and highly significant values for many histological leaflet traits i.e. thickness of
upper; lower epidermis; palisade; spongy tissues; blade leaflet; dimensions of both
upper epidermis cell and midvienal bundles as well as the diameters and thickness of
vessels. Producing hybrids, heterotic for some histological leaflets traits may increase
the mechanical resistance to stress conditions and some serious insects as white fly
as well as other dangerous diseases. The electrophoretic studies showed that all hybrids were characterized by
the increase in band number and intensity as compared with their respective parents. As for agronomic traits, most of the best heterotic combinations were
identified as the combinations of most parental cultivars with Money Maker as a
female parent. Total soluble solids traits showed positive and insignificant values over
mid and better parent. Meanwhile more negative and insignificant values were
detected for fruit pH. Making use of protein electrophoretic studies the best hybrids that appeared
highly band number and intensities, showed also the highest positive and Significant
heterosis values for agronomic traits, and the effective leaflets histological traits. The
combinations between Prichard; Cal Rock; Beto 98 and Floradade as a male parent
with Money Maker as a female, as well as, the hybrid Floradade lC Super strain S,
expressed such situation. The study of protein band number and intensity, for the hybrids confirms the
possibility of nyonos selection In labs before the field evaluation.