QTL analysis of yield-related traits and their association with functional markers in Brassica napus L.
Yuanyuan Li A B , Jinxiong Shen A , Tonghua Wang A , Qingfang Chen A , Xingguo Zhang A , Tingdong Fu A , Jinling Meng A , Jinxing Tu A and Chaozhi Ma A CA National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China.
B Present address: Bioengineering Institute, Weifang University, Weifang 261061, China.
C Corresponding author. Email: yuanbeauty@mail.hzau.edu.cn
Australian Journal of Agricultural Research 58(8) 759-766 https://doi.org/10.1071/AR06350
Submitted: 5 November 2006 Accepted: 24 April 2007 Published: 30 August 2007
Abstract
Yield is one of the most important traits in Brassica napus breeding programs. Quantitative trait loci (QTLs) for yield-related traits based on genetic mapping would help breeders to develop high-yield cultivars. In this study, a genetic linkage map of B. napus, containing 142 sequence-related amplified polymorphism (SRAP) markers, 163 functional markers, 160 simple sequence repeat (SSR) markers, and 117 amplified fragment length polymorphism (AFLP) markers, was constructed in an F2 population of 184 individuals resulting from the cross SI-1300 × Eagle. This map covered 2054.51 cM with an average marker interval of 3.53 cM. Subsequently, QTLs were detected for 12 yield-related traits in Wuhan and Jingmen. In total, 133 QTLs were identified, including 14 consistent ones across the 2 locations. Fifteen of 20 linkage groups (LGs) were found to have QTLs for the 12 traits investigated, and most of the QTLs were clustered, especially on LGs N2 and N7, where similar QTL positions were identified for multiple traits. Eight of 10 QTLs for yield per plant (YP) were also associated with number of seeds per silique (SS), number of siliques per plant (SP), and/or 1000-seed weight (SW). In addition, 45 functional markers involved in 39 expressed sequence tags (ESTs) were linked to the QTLs of 12 traits. The present results may serve as a valuable basis for further molecular dissection of agronomic traits in B. napus, and the markers related to QTLs may offer promising possible makers for marker assisted selection.
Acknowledgments
This work was financially supported by the State Key Basic Research and Development Plan of China (2007CB1090) and by the Program for Changjiang Scholars and the Innovative Research Team in University (IRT0442).
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