Deletion polymorphism in wheat chromosome regions with contrasting recombination rates
Deletion polymorphism in wheat chromosome regions with contrasting recombination rates
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DOI：
10.1534/genetics.103.024927
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发表时间：
2004-11-01
期刊：
影响因子：
3.3
通讯作者：
Luo, MC
中科院分区：
文献类型：
--
作者：
Dvorak, J;Yang, ZL;Luo, MC
对1027份四倍体和六倍体小麦材料以及420份小麦二倍体祖先材料进行了缺失多态性分析。在155个位点中，共发现了26个起源于多倍体小麦进化过程中的缺失。小麦染色体分为近端低重组区间和远端高重组区间，近端低重组区间包含69个位点，远端高重组区间包含86个位点。共有23个缺失涉及位点在远端，高重组区间，只有3个涉及位点在近端，低重组区间。在这两个时间段内，DNA丢失率相差几个数量级。多倍体小麦的二倍体化率的缺失进行了估计，并被证明进行得更快，在远端，高重组间隔比近端，低重组间隔。
Polymorphism for deletions was investigated in 1027 lines of tetraploid and hexaploid wheat and 420 lines of wheat diploid ancestors. A total of 26 deletions originating during the evolution of polyploid wheat were discovered among 155 investigated loci. Wheat chromosomes were divided into a proximal, low-recombination interval containing 69 loci and a distal, high-recombination interval containing 86 loci. A total of 23 deletions involved loci in the distal, high-recombination interval and only 3 involved loci in the proximal, low-recombination interval. The rates of DNA loss differed by several orders of magnitude in the two intervals. The rate of diploidization of polyploid wheat by deletions was estimated and was shown to have proceeded faster in the distal, high-recombination interval than in the proximal, low-recombination interval.