Genetic and physical mapping of photoperiod insensitive gene Ppd-B1 in common wheat
Genetic and physical mapping of photoperiod insensitive gene Ppd-B1 in common wheat
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DOI：
10.1023/b:euph.0000047056.58938.76
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发表时间：
2004-01-01
期刊：
影响因子：
1.9
通讯作者：
William, M
中科院分区：
文献类型：
--
作者：
Mohler, V;Lukman, R;William, M
光周期响应是小麦生长阶段持续时间的主要决定因素。在植物育种计划中有意识地选择这些光周期响应基因将产生更好地适应不同环境的基因型。为了为开发用于选择过程的分子标记提供起点，利用三个分离群体构建了光周期不敏感基因 Ppd-B1 周围的遗传图谱。在为 Ppd-B1 区域选择的 25 个标记中，只有两个可以在所有三个群体中进行定位。在成对比较中，可转移标记的范围从三到八个不等。 Ppd-B1 远端标记物的重组频率比近端标记物的重组频率更均匀。这一发现表明 Ppd-B1 与 2BS 染色体物理图谱中断点 0.83 远端定位的标记更接近。
Photoperiod response is a major determinant of duration of growing stages in wheat. Conscious selection for these photoperiod response genes in plant breeding programs will yield genotypes with better adaptation to diverse environments. To provide a starting point for the development of molecular markers useful for the selection process, genetic maps around the photoperiod insensitive gene Ppd-B1 were built employing three segregating populations. Of 25 markers that were selected for the Ppd-B1 region, only two could be mapped across all three populations. In pairwise comparisons, the extent of transferable markers ranged from three to eight. Recombination frequencies of markers distal to Ppd-B1 were more homogeneous than those of proximal markers. This finding suggested a closer proximity of Ppd-B1 to the markers that were mapped distal to breakpoint 0.83 in the physical map of chromosome 2BS.