用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A...用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A两个籼型不育系为母本配制杂交组合,测定了两个群体与产量相关的5个性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIciMapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,在两套测交群体中共检测到100个杂种优(劣)势位点;在所有检测到的影响单株有效穗数、平均穗长、着粒密度、千粒重等性状的杂种优(劣)势位点中,分别位于第3、7和11染色体上的与杂种优势紧密连锁的分子标记RM5474、RM336、RM287能够在两套测交群体中检测到;还有其它一些微效QTL位点也表现出一因多效现象。展开更多
This paper deals with the following isoperimetric problem in the plane:Among all regions with prescribed perimeter and covering a given line segment,what is the region that has the greatest area?
文摘用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A两个籼型不育系为母本配制杂交组合,测定了两个群体与产量相关的5个性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIciMapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,在两套测交群体中共检测到100个杂种优(劣)势位点;在所有检测到的影响单株有效穗数、平均穗长、着粒密度、千粒重等性状的杂种优(劣)势位点中,分别位于第3、7和11染色体上的与杂种优势紧密连锁的分子标记RM5474、RM336、RM287能够在两套测交群体中检测到;还有其它一些微效QTL位点也表现出一因多效现象。
基金the National Natural Science Foundation of China(Grant No.10671066)the Shanghai Leading Academic Discipline Project(Project No.B407)partially supported by the National Key Basic Research Project of China(Grant No.2006CB805902)
文摘This paper deals with the following isoperimetric problem in the plane:Among all regions with prescribed perimeter and covering a given line segment,what is the region that has the greatest area?
