水稻品种在不同纬度下持久抗瘟性的研究

 1990～1994年，经在不同纬度、不同海拔高度和不同稻作生态类型的重病区设立6个持久抗性稻瘟病鉴定圃。从38000份国内外稻种资源中筛选出140份材料，通过多个抗性组分进行了系统研究。初步表明，Tetep、小粒野生稻（Oryza minuta J.S.Presl ex C.B.Presl）湘资3150、天津野生稻、谷梅2号、魔王谷等被认为具有持久抗性品种的特征和性能，其中小粒野生稻为兼具抗稻褐飞虱（Nilaparvata lugens Stal）的多抗性品种；研究还表明从古老的地方品种及野生稻中发掘持久抗瘟性抗源获得率高。通过对品种多抗性组分主成分分析和品种抗性系统聚类分析，提出了持久抗瘟性鉴定的4个有效组分和品种抗性分类的方法。

Studies on Durable Resistance to Blast Disease in Different Latitudes for Rice

6 rice blast nurseries used for evaluation of durable blast resistance wereset up in high blast pressure areas of different latitudes, elevations and distribution of rice cropping during 1990-1994. 140 rice materials screened from 38 000 rice materials from home and abroad have been analyzed in those nurseries by several resistant components. The resulte primarily indicated that Tetep, Oryza minuta J. S. Presl ex C. B. Presl, Xi-angzi 3150, Tianjin yeshendao, Gumei 2, and Mowanggu were durable resistance to rice blast, among which O. minuta was also durable resistance to Nilaparvata lugens Stal. Meanwhile the research suggests that restistant sources of durability from the old traditional varieties and wild rice are easily obtained. 4 efficient components and classification method of varietal resistance have been put forward by principal components and cluster analyses.