高丹草(高粱×苏丹草)产量及其构成因素的QTL定位与分析

被引：18

作者：

逯晓萍 ^{[1
]}

云锦凤 ^{[2
]}

肖宇红 ^{[3
]}

米福贵 ^{[2
]}

李美娜 ^{[1
]}

尹利 ^{[1
]}

机构：

[1] 内蒙古农业大学农学院

[2] 内蒙古农业大学生态环境学院

[3] 中国科学院北京基因组研究所

来源：

华北农学报 | 2007年 / 04期

关键词：

高丹草; 遗传图谱; 产量性状; 分子标记; QTL定位;

D O I：

暂无

中图分类号：

S544 [一年生禾本科牧草];

学科分类号：

090503 ; 0909 ;

摘要：

利用分子标记技术,在许多作物上已获得了高密度的分子遗传图谱,并定位了许多主要农艺性状的QTL,而在牧草上这方面的研究尚属空白。为提高育种中对牧草产量性状优良基因型选择的效率,对高丹草的单株产量及其构成因素(株高、分蘖数、叶片数)进行QTL定位,确定其在染色体的位置及其遗传效应,探讨其杂种优势产生原因。在以高粱413A和棕壳苏丹草杂交获得的248个F2:3家系构建的作图群体中,应用AFLP和RAPD两种标记技术构建了高丹草(Sorghum×Sudan grass)的遗传连锁图谱。共包含168个标记,分布于10个连锁群,图谱总长度为836 cM,标记间平均图距为4.98 cM。采用Joinmap/QTL4.0对高丹草单株产量及其三大构成因素进行QTL定位。共检测到QTLs19个,分布在8个连锁群上,其中,第1和3连锁群最多,各为4个和3个。单个QTL解释性状表型变异的5.20%～51.50%。检测到的19个QTL中,表现加性效应的有1个,占5.26%,部分显性效应的有3个,占15.79%,显性效应的有6个,占31.58%,超显性效应的有9个,占47.36%。超显性效应和显性效应在高丹草杂种优势的遗传基础中占主导地位。

引用

页码：80 / 85

页数：6

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