Analysis of QTL for seed oil content in Brassica napus by association mapping and QTL mapping

Increasing seed oil content is one of the most important breeding targets for rapeseed ( Brassica napus ). In this study, we combined quantitative trait loci (QTL) mapping and marker-trait association analysis to dissect the genetic basis of seed oil content in rapeseed. A doubled haploid (DH) popul...

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Bibliographic Details
Published in:Euphytica 2017, Vol.213 (1), p.1, Article 17
Main Authors: Fu, Ying, Zhang, Dongqing, Gleeson, Madeleine, Zhang, Yaofeng, Lin, Baogang, Hua, Shuijin, Ding, Houdong, Frauen, Martin, Li, Jiana, Qian, Wei, Yu, Huasheng
Format: Article
Language:English
Subjects:
Analysis
Biomedical and Life Sciences
Biotechnology
Chromosomes
Environmental effects
Gene mapping
Genetic aspects
Genetic markers
Genomics
Genotype & phenotype
Life Sciences
Oils & fats
Plant breeding
Plant Genetics and Genomics
Plant Pathology
Plant Physiology
Plant Sciences
Population genetics
Quantitative genetics
Rape plants
Seeds
Selective breeding
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Summary:Increasing seed oil content is one of the most important breeding targets for rapeseed ( Brassica napus ). In this study, we combined quantitative trait loci (QTL) mapping and marker-trait association analysis to dissect the genetic basis of seed oil content in rapeseed. A doubled haploid (DH) population with 261 lines was grown in two highly contrasting macro-environments, Germany with winter ecotype environment and China with semi-winter ecotype environment, to explore the effect of environment effect of on seed oil content. Notable macro-environment effect was found for seed oil content. 19 QTL for seed oil content were identified across the two macro-environments. For association analysis, a total of 142 rapeseed breeding lines with diverse oil contents were grow in China macro-environment. We identified 23 simple sequence repeat (SSR) markers that were significantly associated with the seed oil content. Comparative analysis revealed that five QTL identified in the DH population, located on chromosomes A03, A09, A10 and C09, were co-localized with 11 significantly associated SSR markers that were identified from the association mapping population. Of which, the QTL on chromosome A10 was found to be homeologous with the QTL on chromosome C09 by aligning QTL confidence intervals with the reference genomes B. napus . Those QTL associated with specific macro-environments provides valuable insight into the genetic regulation of seed oil content and will facilitate marker-assisted breeding of B. napus .
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-016-1817-9