【摘要】 为探讨粳稻遗传多样性,为粳稻不育系的改良提供依据,对我国杂交粳稻中的40个不育系进行亲缘系数分析。结果表明,约60%不育系间的亲缘系数(COP)值为0,COP值变异范围为0.00~0.75,平均值仅为0.03,大多数不育系在系谱上的遗传关系很小或无遗传关系。通过COP聚类分析,供试不育系聚为6个类群,第1个类群共有10个不育系,核心亲本为农垦58;第2个类群共有20个不育系,初步系谱分析表明,他们都是藤板5号的衍生系;第3个类群共有7个不育系,均为农垦57的后代;第4、5、6类群均仅有1个不育系,这些不育系之间以及与其他类群之间的不育系没有共同的祖先亲本。认为,粳稻不育系间系谱上的遗传差异较大,遗传多样性较高。更多还原

【Abstract】 The coefficients of parentage(COP) among forty hybrid Japonica rice sterilize lines were analyzed to explore the genetic diversity and provide a reference for improvement of Japonica rice sterilize lines.The results showed that the COP values varied from 0 to 0.75,with an average of 0.03.About sixty percent of the COP values were 0.It indicated that there was little genetic relationship between those pairs of lines.Clustering of lines based on COP matrix resulted in a total of six groups.GroupⅠconsisted of ten sterilize lines,which all derived from Nongken 58.Group Ⅱ was composed of twenty sterilize lines,they are all offsprings of Tengban 5.Group Ⅲ,composed of seven sterilize lines,these lines derived from Nongken 57.Group Ⅳ,GroupⅤ and GroupⅥ included only one line respectively,the three lines had no relationship with other lines,which indicated that the genetic differences among Japonica rice sterilize lines were great and the genetic diversity was high.更多还原