Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (8): 1471-1480.doi: 10.3864/j.issn.0578-1752.2014.08.003

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

QTL Mapping Based on Embryo and Maternal Genetic Systems for Oil and Protein Contents in Rapeseed (Brassica napus L.)

 XU  Jian-Feng-1, LONG  Yan-2, WU  Jian-Guo-3, ZHAO  Zhi-Gang-4, XU  Hai-Ming-1, WEN  Juan-1, MENG  Jin-Ling-2, SHI  Chun-Hai-1   

  1. 1、College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058;
    2、College of Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070;
    3、School of Agricultural and Food Science, Zhejiang A&F University,Lin’an 311300, Zhejiang;
    4、Qinghai Academy of Agricultural and Forestry Sciences, Xining 810016
  • Received:2013-11-05 Online:2014-04-15 Published:2013-12-23

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Abstract: 【Objective】 In present study, BC1F1 1 and BC1F1 2 populations constructed from Brassica napus genetic population TN DH and parents Tapidor and Ningyou7 were used to analyze the distribution and linkage markers of QTLs with embryo genetic effects, maternal genetic main effects, and their QTL × environment interaction effects on oil and protein contents in rapeseed, as well as to study the influence of environmental interaction on QTL mapped on different genetic systems and explore the optimal strategies and methods for improvement of these two quality traits in marker-assisted selection. 【Method】 A total of 202 TN DH lines and parents were planted in accordance with the general method for field experiments, based on randomized block design with two replications for two years. At flowering stage, BC1F1 1 and BC1F1 2 populations were constructed by double cross between 202 TN DH lines and parents, and the mature seeds of backcross population and parents were harvested for determining the oil and protein contents in rapeseed. Near infrared reflectance calibration models and methods were used for the measurement of oil and protein contents. A genetic map and a newly developed QTL mapping software and methods considering two different genetic systems for quality traits of dicotyledonous crop seeds were used to detect QTLs for oil and protein contents with the data from BC1F1 1 and BC1F1 2 populations in different years. 【Result】 A total of seven QTLs relevant to oil and protein contents in rapeseed were distributed in A1, A4, A6, A7, C2 and C5 linkage groups, in which four QTLs associated with oil content were detected as well as three QTLs for protein content, with total phenotypic contributions of 49.1% and 59.6%, respectively. All QTLs showed extremely significant embryo additive main effects and maternal additive main effects, in which four QTLs were found to have significant or extremely significant embryo dominant main effects, and two QTLs for oil content had significant environmental interaction effects. qOC-6-3 and qPC-4-1 were detected as the important QTLs with larger genetic effects, which could explain 36.3% and 37.9% of the phenotypic variation in oil content and protein content, respectively. qOC-4-2 and qPC-4-1 were co-localized in the A4 linkage group between molecular markers HS-K02-2 and HBR094 with the confidence interval of 17.5-19.4 cM. 【Conclusion】 The results showed that oil content and protein content in rapeseed could be controlled by the expression of QTLs located in different genetic systems of seed embryo and maternal plant, and environment interaction effects play more significant roles on the performance of oil content while the QTL expression of protein content was relatively stable in different environmental conditions. In addition, qOC-6-3 detected on A6 linkage group and qPC-4-1 on A4 linkage group are major QTLs for oil and protein contents，respectively, and three QTLs for protein content in present experiment have not been reported ever since.

Key words: Brassica napus L. , oil content , protein content , quantitative trait locus (QTL) , genetic main effect , QTL ×, environment interaction effect

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