Abstract
Key message
QTL map** for fiber-related traits and elucidation of a stable and novel QTL affecting seed lignin content, cellulose content and seed oil content.
Abstract
Dissection of the genetic networks for fiber biosynthesis is important for improving the seed oil content and meal value of Brassica napus. In this study, the genetic basis of seed fiber biosynthesis in B. napus was investigated via quantitative trait locus (QTL) analysis using a doubled haploid population derived from ‘KenC-8’ crossed with ‘N53-2.’ Seed lignin content (LC), cellulose content (CC) and hemicellulose content (HC) were significantly negatively correlated with seed oil content (OC). Co-localization QTLs among LC, CC, HC and OC on A09 were found with contributions ranging from 9.87 to 48.50%. Seven co-localization QTLs involved in the fiber component and OC were further verified by bulked segregant analysis (BSA). The unique QTL uqA9-12 might be a real and new QTL that was commonly identified by QTL map** and BSA and simultaneously affected LC, CC and OC with opposite additive effects. A potential regulatory network controlling seed fiber biosynthesis was constructed to dissect the complex mechanism of seed fiber and oil accumulation, and numerous candidate genes were identified in the fiber-related QTL regions. These results provided an enrichment of QTLs and potential candidates for fiber biosynthesis, as well as useful new information for understanding the complex genetic mechanism underlying rapeseed seed fiber accumulation.
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Acknowledgements
This work was supported by the National Basic Research Program of China (2015CB150205), National Natural Science Foundation of China (31671721) and New Century Talents Support Program of the Ministry of Education of China (NCET110172).
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LM carried out the QTL analysis and wrote the manuscript. HC and HL analyzed the data. LC, WZ and BL participated in the field experiment. HW, LZ and BW provided helpful suggestions for the manuscript. ML designed, led and coordinated the overall study.
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Miao, L., Chao, H., Chen, L. et al. Stable and novel QTL identification and new insights into the genetic networks affecting seed fiber traits in Brassica napus. Theor Appl Genet 132, 1761–1775 (2019). https://doi.org/10.1007/s00122-019-03313-4
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DOI: https://doi.org/10.1007/s00122-019-03313-4