【摘要】 以 Tetep、Moroberekan、B40为抗、感对照 ,用 8个抗性组分 ,对 47个云南地方稻种资源的抗瘟性进行了系统聚类分析。结果表明 ,可以较好地将 1996～ 1999年的 5 0、2 7、16、11个品种分别分成 6、6、4、3类。持久抗病对照品种 Tetep(感～抗 )分布于 1、2、4类内 ,但较集中于第 2类内 ;持久抗性品种 Moroberekan(感～中抗 )集中于第 2类内 ;云南地方品种大白谷、毫弄早、毫玉浪每年同聚于第 1类品种中 ,经连续几年试验 ,均表现出比 Tetep和 Moroberekan较稳定和较强的抗瘟性。第 3、5、6类为感病品种 ,其中第 3类感病对照品种 B40历年与其他品种间的距离较其他品种相互间聚类距离大 ,属高度感病。连续4年的试验结果表明 ,系统聚类分析可作为水稻持久抗瘟性品种筛选的方法。更多还原

【Abstract】 Eight resistant indexes being used as appraisal standards to rice blast,cluster analysis were conducted on 47 Yunnan local rice varieties and Tetep (a rice variety with durable resistance to rice blast) , Moroberekan (a rice variety which is conceived as durable resistance to rice blast) and B40 (a rice variety with high susceptibility to rice blast). The results showed that all rice varieties examined each year from 1996 to 1999 could be divided into six, six, four and three groups respectively. Two resistant control varieties, Tetep and Moroberekan, were divided into the groups moderately resistant to susceptible to rice blast. However, three Yunan local rice varieties, Dabaigu, Haolongzao, and Haoyulang had higher resistance to rice blast than that of the two resistant control varieties. The results from four years also showed that cluster analysis could be an objective and practical method for screening rice varieties which are resistant to rice blast.更多还原