西瓜新品种农科大5号的选育

A New Watermelon F_1 Hybrid —‘Nongkeda No.5’

农科大5号是以自交系M18为母本,自交系F23为父本配制而成的西瓜新品种一代杂种。早熟,果实发育期28～30d(天),全生育期90～92d(天);易坐果,果实圆形,果形指数1.1;果皮深绿色,覆墨绿色中细条带,皮厚0.93cm,硬韧,耐贮运;果肉红色,肉质沙细,汁多纤维少,口感佳,品质优,中心折光糖含量12.4%,中边糖梯度小;田间调查表明对蔓枯病的抗性强于对照京欣2号,枯萎病零星发生,未见炭疽病和白粉病发生;单瓜质量5.9kg,产量3200kg·(667m2)-1。适宜在陕西及同类生态区早春设施西瓜种植区种植。

A new early maturing watermelon F1 hybrid‘Nongkeda No.5’was bred by crossing inbred lines M18 as female parent and F23 as male parent. Its fruit development period is 28 to 30 days, and the whole growing period is 90-92 days. The variety is easy to bear fruits. The fruit’s index is 1.1. Its fruit is of round shape and covered with dark green bands in thin strip. The fruit rind is about 0.93 cm thick. It is good for storage and transportation. The color of flesh is bright red and the fresh is succulent with high quality and good flavor. The soluble solid content in the core area of flesh is 12.4 %, and the gradient in brim area is small. The field investigation shows that‘Nongkeda No.5’has stronger resistance to gummy stem blight than‘Jingxin No.2’, and there is a few fusarium wilt, anthracnose and powdery mildew didn’t occur. The single fruit is about 5.9 kg, and the yield is 48.0 t·hm^-2. It is suitable for cultivation in facility watermelon planting regions in Shaanxi province and areas with same ecological conditions in early spring.