Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes
Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes
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DOI：
10.4238/2011.december.22.5
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发表时间：
2011-01-01
影响因子：
0.4
通讯作者：
He, C.
中科院分区：
文献类型：
--
作者：
Liu, X. H.;He, S. L.;He, C.
穗粒数是玉米最重要的产量相关农艺性状之一。为明确其遗传基础，对Mo17和黄早4系重组自交系群体在两种氮素处理下的KNE进行了数量性状位点（QTL）分析。在高氮条件下，4、6和9号染色体上的7个qtl被定位，解释了表型变异范围为5.03 ~ 15.49%。低氮条件下，6、9号染色体上有3个qtl，占表型变异的8.54% ~ 12.21%。这些qtl与最近的标记具有不同的定位间隔，范围为0 ~ 16.5 cM。根据这些qtl的染色体位置和遗传效应，本实验仅鉴定出7个与KNE相关的qtl，其中3个在两种N条件下均被发现，分别位于染色体6(1)和9(2)上；另外4个基因仅在高氮条件下被定位在染色体4(3)和6(1)上。这些信息可用于玉米育种项目中标记辅助选择的开发。
Kernel number per ear (KNE) is one of the most important yield-related agronomic traits in maize (Zea mays). To clarify its genetic basis, we made a quantitative trait locus (QTL) analysis of KNE in a recombinant inbred line population derived from lines Mo17 and Huangzao4, under two nitrogen (N) regimes. Seven QTLs, on chromosomes 4, 6 and 9, were mapped under the high N regime, which explained phenotypic variation ranging from 5.03 to 15.49%. Under the low N regime, three QTLs were located on chromosomes 6 and 9, which accounted for phenotypic variation ranging from 8.54 to 12.21%. These QTLs had different mapping intervals to their nearest markers, ranging from 0 to 16.5 cM. According to the chromosome positions and genetic effects of these QTLs, only seven QTLs for KNE were identified in our experiment, out of which three were found under both N regimes, on chromosomes 6 (one) and 9 (two); the other four were mapped only under the high N regime, on chromosomes 4 (three) and 6 (one). This information could be useful for developing marker-assisted selection in maize-breeding projects.