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Improving seed germination and oil contents by regulating the GDSL transcriptional level in Brassica napus

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Seed germination rate and oil content can be regulated at theGDSL transcriptional level by eitherAtGDSL1 orBnGDSL1 inB. napus.

Abstract

Gly-Asp-Ser-Leu (GDSL)-motif lipases represent an important subfamily of lipolytic enzymes, which play important roles in lipid metabolism, seed development, abiotic stress, and pathogen defense. In the present study, two closely related GDSL-motif lipases, Brassica napus GDSL1 and Arabidopsis thaliana GDSL1, were characterized as functioning in regulating germination rate and seed oil content in B. napus. AtGDSL1 and BnGDSL1 overexpression lines showed an increased seed germination rate and improved seedling establishment compared with wild type. Meanwhile, the constitutive overexpression of AtGDSL1 and BnGDSL1 promoted lipid catabolism and decreased the seed oil content. While RNAi-mediated suppression of BnGDSL1 (Bngdsl1) in B. napus improved the seed oil content and decreased seed germination rate. Moreover, the Bngdsl1 transgenic seeds showed changes in the fatty acid (FA) composition, featuring an increase in C18:1 and a decrease in C18:2 and C18:3. The transcriptional levels of six related core enzymes involved in FA mobilization were all elevated in the AtGDSL1 and BnGDSL1 overexpression lines, but strongly suppressed in the Bngdsl1 transgenic line. These results suggest that improving the seed germination and seed oil content in B. napus could be achieved by regulating the GDSL transcriptional level.

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Acknowledgements

This work was supported by the National Key R&D Program of China (2016YFD0101904 and 2016YFD0100305) and the National Natural Science Foundation of China (31471527 and 31271760).

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  1. Li-Na Ding and Xiao-Juan Guo contributed equally to this work.

Authors and Affiliations

  1. Institute of Life Sciences, Jiangsu University, Zhenjiang, China

    Li-Na Ding, Xiao-Juan Guo, Ming Li, Zheng-Li Fu, Su-Zhen Yan, Ke-Ming Zhu, Zheng Wang & Xiao-Li Tan

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  1. Li-Na Ding
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Correspondence to Xiao-Li Tan.

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Communicated by Hiroyasu Ebinuma.

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Ding, LN., Guo, XJ., Li, M. et al. Improving seed germination and oil contents by regulating the GDSL transcriptional level in Brassica napus. Plant Cell Rep 38, 243–253 (2019). https://doi.org/10.1007/s00299-018-2365-7

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  • DOI: https://doi.org/10.1007/s00299-018-2365-7

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