基于遗传位置的水稻与玉米重要农艺性状QTL比较研究

 收集整理了水稻与玉米15个共有性状已发表的QTL定位信息，依据QTL遗传位置信息整合遗传图谱，开展了水稻与玉米基因组QTL水平的比较研究工作。结果表明：1）任一性状QTL的定位频率在染色体上的不同区域内是不同的，存在着若干“热点区域”。QTL定位频率较高的区域，往往能够反映不同遗传背景、不同环境条件下这一区域对特定性状的强表达。在这些区段内，有较高的概率找到控制这一性状遗传率较高的QTL。2）几个不同性状QTL的热点区域常常发生重合，这可能是控制不同性状的基因在染色体上密集排列紧密连锁成一个基因簇造成的；也可能是一个基因影响了多个性状，即一因多效的结果。这些同时对几个性状产生影响的活跃区域，对作物的遗传改良有较大利用价值。

Genetic Position-Based Comparative Study of Quantitative Trait Loci for Major Traits Between Rice and Maize

Fifteen common traits of rice and maize among almost all the published QTL mapping information, such as plant height, were collected and arranged, which were integrated into common genetic map according to the QTL genetic position. Comparative study was implemented at the genome QTL level between rice and maize. The results indicated that the QTL mapping frequencies for any trait on different chromosome regions were different, and there were several hot spot regions. The region with high frequency might mean high expression of the specific traits under various genetic background and environmental conditions. In these regions, there was higher probability to detect the high heritability QTL. QTL hot spot regions often overlaped for different traits. It may result from genes underlying different traits, which were condensed on the chromosome and close linked to form a gene cluster. It can also be the result of pleiotropy, that is, one gene influences several traits. These active regions simultaneously controlling different traits are vital to the crop genetic improvement.