QTL detected for grain-filling rate in maize using a RIL population
QTL detected for grain-filling rate in maize using a RIL population
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使用 RIL 群体检测玉米灌浆率 QTL
DOI：
10.1007/s11032-010-9410-8
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发表时间：
2011-01-01
影响因子：
3.1
通讯作者：
Tang, J. H.
中科院分区：
文献类型：
--
作者：
Liu, Z. H.;Ji, H. Q.;Tang, J. H.
籽粒灌浆速率是决定籽粒产量的重要因素。为了阐明籽粒灌浆速率的遗传基础，在两年多的时间里，在两个地点对203个重组自交系进行了评估。对217个SSR标记组成的遗传连锁图谱进行条件性和非条件性QTL分析，检测到控制灌浆速率的QTL。结果表明，授粉后15~35d，籽粒灌浆速率增加，后两次取样时灌浆速率下降；籽粒灌浆速率高的杂交种决定了玉米生长季节较短地区的粮食产量。以百粒重为输入数据，在不同取样阶段共检测到23个影响灌浆速率的非条件QTL。它们分布在10条染色体上(9号染色体除外)，并在不同的取样阶段检测到一些QTL。此外，利用两个取样时间之间的平均百粒重日增加值定位了9个条件QTL，采用非条件QTL作图策略同时检测到6个条件QTL。QTL定位结果表明，玉米籽粒灌浆速率受复杂的遗传机制控制，不同取样阶段检测到的QTL可能是影响玉米籽粒产量的重要因素。
The grain-filling rate plays an important role in determining grain yield. To elucidate the genetic basis of the grain-filling rate, a set of 203 recombinant inbred lines was evaluated at two locations over 2 years. Quantitative trait loci (QTL) for grain-filling rate were detected using conditional and unconditional QTL analysis of genetic linkage maps comprising 217 SSR markers. The results showed that the grain-filling rate increased between 15 and 35 days after pollination, then decreased at the last two sampling times. Hybrids with high grain-filling rates determined the grain yield in those areas with a short growth season for maize. A total of 23 unconditional QTL for grain-filling rate were detected using the 100-kernel weight as the input data at different sampling stages. They were distributed on 10 chromosomes (except chromosome 9), and some QTL were detected at different sampling stages. In addition, nine conditional QTL were identified using the average increase in 100-kernel weight of per day between two sampling times, and six conditional QTL were detected simultaneously using the unconditional QTL mapping strategy. The QTL mapping results demonstrated that the grain-filling rate is controlled by a complex genetic mechanism, and the QTL detected at different sampling stages might be important contributors to grain yield in maize.