Wang C L, Cheng F F, Sun Z H, Tang J H, Wu L C, Ku L X, Chen Y H
College of Agronomy, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China.
Theor Appl Genet. 2008 Nov;117(7):1129-39. doi: 10.1007/s00122-008-0851-y. Epub 2008 Aug 2.
Photoperiod sensitivity is an important consideration in maize cultivation. Flowering time is affected by photoperiod and sensitivity to it limits the potential for successful exchange of germplasm across different latitudes. For resolving the genetic basis of photoperiod sensitivity in maize, a set of 207 recombinant inbred lines derived from a temperate and tropical inbred line cross was evaluated for 2 years in a long-day and short-day environment. Genetic linkage maps were constructed using 237 SSR markers with a total length 1,974.3 cM, and an average space between two makers of 8.33 cM. Twenty-nine QTL were detected for the five measured photoperiod sensitivity traits using composite interval mapping and multiple interval mapping. QTL for flowering time, plant height and leaf number, under long-day conditions, were found clustered on chromosome 10, while QTL for short-day conditions resided on chromosome 3. The QTL in the bin 10.04 region of chromosome 10 were detected associated with photoperiod sensitivity and related traits during long days. These results indicated that this region might contain an important photoperiod sensitivity element.
光周期敏感性是玉米种植中的一个重要考量因素。开花时间受光周期影响，对光周期的敏感性限制了不同纬度间成功进行种质交换的可能性。为解析玉米光周期敏感性的遗传基础，对一组由一个温带自交系和一个热带自交系杂交产生的207个重组自交系在长日照和短日照环境下进行了两年评估。利用237个SSR标记构建了遗传连锁图谱，图谱总长1974.3 cM，两个标记间的平均间距为8.33 cM。使用复合区间作图法和多区间作图法，对所测的五个光周期敏感性性状检测到了29个QTL。在长日照条件下，开花时间、株高和叶片数的QTL在第10号染色体上成簇分布，而短日照条件下的QTL位于第3号染色体上。在第10号染色体10.04区间检测到的QTL与长日照期间的光周期敏感性及相关性状有关。这些结果表明该区域可能包含一个重要的光周期敏感性元件。
