春播胡萝卜新品种天红5号的选育

天红5号以雄性不育系HLBcms005为母本，由日本引进的抗抽薹品种经过多代分离提纯后而获得的品系HLBm005为父本，采用 雄性不育三系配套育种技术选育的胡萝卜一代杂种。株高62 cm左右，10片叶，叶丛直立；肉质根根形整齐，表皮光滑，呈圆柱形， 橘红色、颜色深，髓心较细，平均根长14.47 cm，根粗4.06 cm，根质量106.92 g；胡萝卜素含量70.28 mg·kg^-1（FW），可溶性固 形物9.11 %，品质好；大棚春播抽薹率0.26 %,较适宜春播。生长期100～105 d(天)，每667 m²留苗28 000~30 000株，产量 3 200 kg左右。

A New Carrot F1 Hybrid Cultivated in Spring -'Tianhong No.5'

A new F1 hybrid variety of carrot'Tianhong No.5'was selected by using males sterile three-line methods.Its female parent is HLBcms005 and male parent is HLBm005.The plants grow upward and strongly.The plant high is about 62 cm with 10 leaves.Its fleshy roots are uniform,of column shape.The average root length is 14.47 cm.The root width is 4.06 cm and average root weight is 106.92 g.Its carotene content amounts to 70.28 mg·kg-1(FW).The soluble solid content is 9.11 %.Its growing period is 100-105 days.The average yield is 48 t·hm-2.There are 420 000-450 000 plants per hm2.It is suitable for spring sowing,the bolting percentage is 0.26 %.