Prediction of heterosis using QTLs for yield traits in rapeseed (Brassica napus L.)

文献类型： 外文期刊

第一作者： Shen, Jin-Xiong

作者： Shen, Jin-Xiong;Fu, Ting-Dong;Yang, Guang-Sheng;Tu, Jin-Xing;Ma, Chao-Zhi

作者机构：

关键词： Brassica napus;heterosis;heterozygosity;prediction;quantitative trait locus (QTL)

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

ISSN： 0014-2336

年卷期： 2006 年 151 卷 2 期

页码：

收录情况： SCI

摘要： Three double low (erucic acid and glucosinolates) self-incompatible lines and 22 varieties from different origins were selected to produce 66 hybrids according to a NC II mating design. Field experiments for identification of hybrid performance and heterosis were conducted in two successive rapeseed growing seasons in Wuhan, China. After heterosis identifications, SI-1300 and Eagle were chosen to construct an F-2 segregating population. One hundred and eighty four F-2:3 lines were planted at Wuhan and Jingmen to test yield traits. F-2 plants and the 25 parents were analyzed using simultaneously AFLP (amplified fragment length polymorphism) and SSR (simple sequence repeat) markers. A total of 270 and 718 polymorphic loci were detected in the F-2 population and among the 25 parental lines, respectively. Of the 718 polymorphic loci, 178 were significantly correlated to yield traits. With the use of one-way ANOVA, 84 common QTLs were detected for 12 traits at two trial locations. Although the genetic distances based on general/specific heterozygosities and single-locus QTLs showed significant correlations with hybrid performance and heterosis for some yield traits, the determination coefficients were low. The results suggested that neither heterozygosities nor QTLs for yield traits were suitable to predict hybrid performance and heterosis in Brassica napus.

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