Abstract
With the increasing public attention to the health benefit of polyunsaturated fatty acids (PUFAs) and demand for linolenic acid (C18:3), it is of great significance to increase the C18:3 content in our meal. As an oil crop with high content of C18:3, Camelina sativa has three homologous copies of FAD2 and three homologous copies FAD3. In this study, we seed-specifically overexpressed two Camelina sativa fatty acid desaturase genes, CsFAD2 and CsFAD3, in rapeseed cultivar Zhongshuang 9. The results show that C18:3 content in CsFAD2 and CsFAD3 overexpressed seeds is increased from 8.62% in wild-type (WT) to 10.62–12.95% and 14.54–26.16%, respectively. We crossed CsFAD2 and CsFAD3 overexpression lines, and stable homozygous digenic crossed lines were obtained. The C18:3 content was increased from 8.62% in WT to 28.46–53.57% in crossed overexpression lines. In addition, we found that the overexpression of CsFAD2 and CsFAD3 had no effect on rapeseed growth, development, and other agronomic traits. In conclusion, we successfully generated rapeseed germplasms with high C18:3 content by simultaneously overexpressing CsFAD2 and CsFAD3, which provides a feasible way for breeding high C18:3 rapeseed cultivars.
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Funding
This work was supported by grants from the National Science Fund for Distinguished Young Scholars (32225037), the Fundamental Research Funds for the Central Universities (2662022ZKPY001), the Hubei Hongshan Laboratory (2021HSZD004), the HZAU-AGIS Cooperation Fund (SZYJY2022008), and the Higher Education Discipline Innovation Project (B20051).
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L.G. and S.T. designed and supervised this study. Y.L., Z.D., and Y.L. performed the experiments. Y.L. and Y.L. analyzed the data. Y.L. wrote the manuscript. L.G., S.T., and S.L. revised the manuscript. All authors read and approved the manuscript.
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Liu, Y., Du, Z., Li, Y. et al. Improving linolenic acid content in rapeseed oil by overexpression of CsFAD2 and CsFAD3 genes. Mol Breeding 44, 9 (2024). https://doi.org/10.1007/s11032-024-01445-0
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DOI: https://doi.org/10.1007/s11032-024-01445-0