耐裂球早熟甘蓝新品种青农55的选育

青农55是以耐裂球早熟ogura雄性不育系A05-1-3-15为母本,以耐裂球早熟自交系荷引-1为父本配制成的耐裂球甘蓝一代杂种。早熟,定植后50~55d(天)成熟,成熟后15d(天)内裂球率小于0.5%。外叶12片左右,叶球圆形,球高16~18cm。球外叶两叶叠抱,绿色,油亮,内叶淡黄色,口感甜脆,中心柱长度仅为叶球高度的1/2左右,采收初期平均单球质量1.2~1.4kg。秋季露地栽培每667m2净菜产量4500kg,春季保护地栽培每667m2净菜产量可达5000kg以上。高抗黑腐病,耐霜霉病。适宜北方地区春季保护地、秋季露地早熟栽培。

A New Crack-tolerant Cabbage Variety—‘Qingnong 55’

‘Qingnong 55’ is a new crack-tolerant cabbage variety developed by crossing cytoplasmic male sterility（CMS）line A05-1-3-15 as female parent with self-compatible line Heyin-1 as male parent. It is of early maturity. It takes 50-55 days from transplantation to harvest. Its head crack rate is less than 0.5% within 15 days after its maturity. The outer leaves are about 12 pieces and shining green in color. Its head is round and about 16-18 cm in length. The inner leaves are light yellow in color and taste sweet and crispy. Its central axis is extremely short，about 1/2 of the head height. The average single head weight in initial harvest period is about 1.2-1.4 kg.The total yield can reach 67.5 t·hm^-2 for open field in autumn and over 75 t·hm^-2 for simple plastic tunnels in spring. This variety is resistant to black rot and tolerant to downy mildew. It is suitable to be planted in northern China in spring in protected land and in autumn in open fields.