摘要
根据稻种的抗瘟信息流强度,选择长年代种植和经过病区协同进化稳定性选择的稻种,作为筛选持久抗瘟性稻种的供试材料。这些材料经多年在稻瘟病菌毒性小种(生态毒性型毒株)类群复杂、选择压力强等一组有生态稻作区代表类型的纬度性病区病圃鉴定和主要抗性组分测定所优选,再进行纬度性分离菌抗谱测定,将经受时空动态综合效应有效检验的稻种作为中选目标稻种。抗瘟信息追踪考证和系统综合分析(含基因分析)等方法,是持久抗瘟性稻种鉴定与评价的有效方法。选用苗期病斑孢子层级指数、产孢量、成株期或苗期叶瘟严重度和穗颈瘟严重率4个组分,作为持久抗瘟性稻种病区病圃鉴定评价的有效组分和定量指标。
Experiments indicated the effective way for evaluating rice germplasm with durable resistance to rice blast includes: to collect rice materials which well grow in the disease- attacked areas, screen them in typical blast nurseries at different latitudes and detemine their major resistant factors and resistance spectrum. Those varieties (lines) passing this series of time - space tests will be evaluated as certificated rice materials with durable blast resistance. The results indicate spore layer grade index in seedling's lesions, spore amount, severity of leaf blast and neck blast in adult plants or seedlings are the four major indices for the durable blast resistance evaluation.
出处
《湖南农业科学》
2003年第2期38-41,共4页
Hunan Agricultural Sciences
关键词
稻种
持久抗瘟性
鉴定
评价方法
rice variety
durable blast resistance
identification
evaluation method
