Evaluation of tomato (Solanum lycopersicum L.) lines and varieties to develop new breeding lines in Korea

Vegetable Research Division, National Institute of Horticultural and Herbal Science (NIHHS) in Korea, collected, evaluated and selected tomato (Solanum lycopersicum L.) lines for fruit characteristics and disease resistance traits to provide new breeding lines for tomato breeders, researchers and producers. The evaluated tomato accessions comprised of 24 germplasm accessions, 25 breeding lines from World Vegetable Center and other countries, 25 NIHHS varieties, and 10 Korean commercial cultivars. Fruit setting ratio ranged from 11.2 to 93.6%, fruit weight from 2.1 to 286.1 g, fruit length/ width ratio from 0.8 to 1.7 and fruit sugar contents from 3.9 to 10.4°Brix. Molecular marker analyses were conducted for 12 disease resistances such as Tomato yellow leaf curl virus (Ty1, Ty2 and Ty3), Fusarium wilt (I2 and I3), Tomato spotted wilt virus (TSWV, Sw5) Phytophthora blight (Ph3-C), Pseudomonas (Pto), Verticillium wilt (Ve), Tomato mosaic virus (ToMV, Tm-2), Root nematode (Rex), and Alternaria blight (Asc1). By a biological assay for tomato bacterial wilt (Ralstonia solanacearum) resistance, 50 plants with bacterial wilt-resistance from 15 accessions were selected for further research and generation advancement.