水稻籽粒硒含量的QTL定位及遗传分析

Selenium (Se) has been recognized as an essential trace element for human beings and plays a number of functions important to human health. Understanding the genetic of Selenium contents in rice and QTL mapping are the basis for effective selection in Selenium breeding program. In the present study, a set of 145 F2 lines derived from the cross between Fengxin red rice and Minghui 100 were used to detect QTLs associated with Selenium contents with 92 SSR markers covering the whole rice genome. A total of 6 QTLs were detected for Selenium contents on chromosome 2,3,5,6,7, respectively. Accounting for general contributions range of 4.97%～12.75% to Selenium contents. qSe3 was located between rm7 and rm251on chromosome3 with the largest general contributions 12.74% to phenotypic variation. The favorable allele of qSe3 for Selenium contents originated from Fengxin red rice and was controlled by dominant effect. And the total general contributions of 6 QTLs was 42.19% with cumulative effect .This helps to further understand the genetic basis for Selenium contents and will provide the basis for gene mapping of Selenium contents and molecular marker–assisted selection in breeding for Selenium traits in rice.