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2016年全国植物生物学大会

作者： Nannan Liu Yingjie Xiao Jianxiao Liu Qingchun Pan Hong Wang Wei Zhan Jie Liu Xiaohong Yang Jianbing Yan National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University College of Informatics Huazhong Agricultural University National Maize Improvement Center of ChinaBeijing Key Laboratory of Crop Genetic Improvement China Agricultural University

residual heterozygosity(RH) in advanced inbred progenies of plants benefits quantitative trait locus(QTL) mapping studies. However,knowledge of factors affecting its genome-wide distribution remains limited. In this study,a collection of maize heterogeneous inbred family(HIF) lines was assembled,comprising a set of 12 recombinant inbred line(RIL) populations with 2,196 lines that were genotyped using a Maize50 K commercial SNP chip. Each population revealed 505 to 2095 RH intervals which collapsed to 18,615 unique RH intervals across 12 populations,covering 94.8% of the maize genome. On average,a given RH region was present in 5 different individuals. We found that some genomic regions were enriched in RH segments and seven RH hotspots were identified in the genome. The RH patterns varied significantly across populations,presumably reflecting differences in genetic backgrounds and 8 QTLs were identified for the RH hotspots in and of themselves. QTL fine mapping of kernel tocopherol content demonstrated a potential of the HIF library to efficiently map QTL locations,down to approximately ≤ 1Mb-resolution based on publicly available information for the 12 populations. The library of HIF lines gave us new insights into the RH landscape and its intraspecific variation and provides a useful resource for QTL cloning of agronomic important traits in maize.

关键词： maize residual heterozygosity heterogeneous inbred family QTL mapping recombinant inbred lines

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Minor-effect QTL for heading date detected in crosses between indica rice cultivar Teqing and near isogenic lines of IR24

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The Crop Journal 2018年第3期6卷 291-298页

作者： Zhichao Sun Yujun Zhu Junyu Chen Hui Zhang Zhenhua Zhang Xiaojun Niu Yeyang Fan Jieyun Zhuang State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement China National Rice Research Institute College of Crop Science Fujian Agriculture and Forestry University Rice Research Institute Fujian Academy of Agricultural Sciences

Identification of quantitative trait loci(QTL) having small effects on heading date(HD) is important for fine-tuning flowering time in rice(Oryza sativa L.). In this study, minor-effect QTL for HD were identified using five segregating rice populations, including a recombinant inbred line population derived from crosses between indica cultivar Teqing and near isogenic lines of IR24,and four populations derived from residual heterozygotes identified in the original *** data from these populations were obtained in multiple years or at two locations with different photoperiods. A total of 11 QTL were detected; they had small additive effects ranging from 0.21 to1.63 days. The QTL were all detected in different populations, locations and/or years, having consistent allelic effects across experiments and a stable magnitude across years at the same location. These QTL, and other minor-effect QTL that have been cloned or fine-mapped, generally do not have strong photoperiod sensitivity, and thus can be used in a wide range of ecogeographical conditions. Seven of the 11 QTL were different from those that have been cloned or fine-mapped, providing new candidates for gene cloning and marker-assisted breeding. Allelic effects of QTL corresponding to those that had been cloned or fine-mapped, were much smaller in this study than previously reported. The results supported the assumption that qualitative and quantitative genes may be different alleles at the same loci, suggesting that it may be promising to identify minor-effect QTL from major heading date genes/QTL that have been cloned.

关键词： Growth rate Oryza sativa Quantitative trait locus residual heterozygosity

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