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Identification of major QTL for silique traits in Brassica napus
Qi Liping,Mao Long,Sun Chengming,Fu Tingdong,Shen Jinxing,Tu Jinxing,Ma Chaozhi,Wen Jing * #,Yi Bin
Plant Science and technology college, Huazhong Agricultural university, Wuhan, 430070
*Correspondence author
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Funding: This research was funded by theSpecialized Research Fund for the Doctoral Program of Higher Education (No.20090146120014)
Opened online:20 December 2012
Accepted by: none
Citation: Qi Liping,Mao Long,Sun Chengming.Identification of major QTL for silique traits in Brassica napus[OL]. [20 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4500697
 
 
Silique is the most important photosynthetic organ in the later period of rapeseed growth. Silique length (SL), number of seeds per silique (SN) and thousand seed weight (TSW) are known as direct or indirect factors influencing seed yield in Brassica napus. One hundred and eighty-one double haploid (DH) lines derived from two lines with distinct silique traits were employed to map quantitative trait loci (QTL) for SL, SN and TSW in B. napus. Field data from three environments were collected for correlation analysis and QTL mapping for SL, SN and TSW. The broad-sense heritability of SL, SN and TSW was 95.24%, 67.24% and 91.01%, respectively, suggesting that genetic variance played a leading role in total variations for SL and TSW. 37 consensus QTL and 31 unique QTL were identified by two-round meta-analysis. Among the 37 consensus QTL, two, two, four QTL detected on A9, A9 and A1 linkage group had effects on SL, TSW and SN. It could explain more than16.22-64.36% of trait variation. In addition, two, two, and three pairs of additive by additive (AA) interactions with small effects were detected for SL, SN and TSW, respectively. Our results will provide a basis for map-based cloning of QTL affecting silique traits and marker-assistant selection (MAS) in breeding of new rapeseed variety exhibiting higher seed yield.
Keywords:Crop genetics and breeding; Brassica napus; Quantitative trait loci (QTL) mapping; Silique traits
 
 
 

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