Abstract:

Tongguan No.2 is a new pakchoi F₁ hybrid that is developed by two self-incompatible lines Qgc431 as the female parent and Qgc452 as the male parent. The plant type is petite, compact and high level of girding. The leaves are broad oval, with green color and non-obvious veins, and the petioles are smooth, wide and thick with pale green color. In short, the appearance and the quality of flavor are good. It is harvested about 45 days after adopting facility protective planting in autumn in Zhejiang area. The size of plant is 18.2 cm in height and 22.2 cm×23.3 cm in expansion diameter. The maximum leaf length is 21.2 cm, the maximum leaf width is 12.5 cm, the petiole length is 6.3 cm, the petiole width is 4.0 cm. The average weight of single plant is about 149.7 g, and the average yield per 667 m² is about 1 873.0 kg. It is highly resistant to virus disease, moderately resistant to soft rot. It has wide adaptability all over the country for cultivation. It is suitable for planting in late spring and autumn when cultivated in the middle and lower reaches of the Yangtze River and similar ecological characteristics area. It was applied for the identification of Zhejiang Crop Cultivar Approval Committee in 2023.

Key words: pakchoi, Tongguan No.2, variety breeding, cultivation techniques