Determination of some biochemical properties in earliness tomato lines

In this study, twenty early tomato pure lines from Enza Zaden Company's gene bank which are resistant todiseases such as Tomato Mosaic Virus (ToMV), Tomato Yellow Leaf Curly Virus (TYLCV), Tomato Stain Wilt Virus (TSWV), Nematode (Mi), Verticillium dahlie (Vd), Fusarium (Fol) and Tomato Leaf Mold (Clad) were used. Properties of these lines, such as fruit color, pH, total carotene and xanthophyll, titratable acidity, brix, total phenolics, total sugars, reducing sugars, ascorbic acid, lycopene and β-carotene contents were evaluated. Moreover, in this thesis, the yield, resistance to diseases and pests in breeding programs and the importance of fruit quality characteristics were also emphasized. With the determination of superior lines in terms of biochemical properties, it is aimed to develop high quality and commercial varieties in future studies. The yields of the lines used in this study ranged from 2.5 to 9.2 kg per plant, while average fruit weights ranged from 86 to 246 g. As a result, L* values in tomato fruits varied between 30.87 and 45.35, a* values between 8.36 and 21.48, b* values between 15.28 and 42.17. Total carotene, total xanthophyll, titratable acidity, pH, brix, ascorbic acid, lycopene values in tomato fruits changed from 80.2 to 197.5 mg/100 g, from 115.3 to 256.6 mg/100 g, from 0.27 to 0.40%, from 3.75 to 4.95, from 2.60 to 6.30%, from 10.50 to 28.78 mg/100 g and from 1.6 to 4.09 mg/100 g respectively. Total and reducing sugar contents were found between 7.31-17.51 mg/g and 2.46-6.57 mg/g. According to these values, it was determined that H7, H17 and H3 lines were superior in terms of biochemical properties. These data could be used as a genetic resource in breeding programs to develop new varieties.