为了丰富板蓝根种质，促进板蓝根产业提质增效。采用单株选择法选育出了板蓝根新品种定蓝2号。2017 — 2019年在不同生态区进行的区域试验中, 定蓝2号鲜板蓝根折合平均产量12 787.5 kg/hm2，较对照品种定蓝1号增产5.8%。在2018 — 2019年进行的大田生产示范中，鲜板蓝根折合平均产量12 232.5 kg/hm2，较对照品种定蓝1号增产6.9%。定蓝2号特级品出成率平均22.9%，较对照品种定蓝1号提高4.0个百分点；一级品出成率平均为23.5%，较对照品种定蓝1号提高7.5个百分点。测定结果表明，定蓝2号内在质量优于2020版《中国药典》标准。定蓝2号霜霉病平均发病率为15.7%，较对照品种定蓝1号降低55.0%；病情指数为16.8，较对照品种定蓝1号降低34.1%。适宜在海拔1 800～2 300 m、年降水量400～550 mm有灌溉条件或者降水充足的地区种植。

To enrich varieties of Radix isatidis and to promote the improvement of quality and efficiency in the Radix isatidis industry development, by using the method of single plant selection, a new Radix isatidis variety Dinglan 2 was bred. From 2017 to 2019, yield data in the regional experiment conducted in different ecological areas showed an average yield of 12 787.5 kg/ha, which showed an increase of 5.8% over the control variety Dinglan 1. From 2018 to 2019, the average fresh yield in the demonstration of field production was 12 232.5 kg/ha, which was 6.9% higher than that of the control variety Dinglan 1. The average rate of premium grade product in Dinglan 2 was 22.9% which was 4.0 percent higher than that of the control variety Dinglan 1, the average rate of the first-grade product in Dinglan 2 was 23.5% which was 7.5 percent higher than that of the control variety Dinglan 1. The results of internal mass determination of Dinglan 2 showed that it was better than the standard of Chinese Pharmacopoeia in 2020. The average incidence rate of downy mildew in Dinglan 2 was 15.7% which was 55.0% lower than that in the control variety Dinglan 1. The disease index was 16.8 which was 34.1% lower than that of the control variety Dinglan 1. It is suitable for application and popularization in ecological areas with irrigation conditions or sufficient precipitation at the altitude of 1 800 to 2 300 m asl and annual precipitation of 400 to 550 mm.

S567.2

甘肃省重点研发计划项目(20YF8NJ166)；甘肃省重大专项(22ZD6FA021-1)。