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Linum usitatissimum FAD2A and FAD3A enhance seed polyunsaturated fatty acid accumulation and seedling cold tolerance in Arabidopsis thaliana

文献类型： 外文期刊

作者： Wang, Jianjun 1 ; Liu, Zijin 1 ; Liu, Hua 1 ; Peng, Danshuai 1 ; Zhang, Jianping 3 ; Chen, Mingxun 1 ;

作者机构： 1.Northwest A&F Univ, State Key Lab Crop Stress Biol Arid Areas, 3 Taicheng Rd, Yangling 712100, Shaanxi, Peoples R China

2.Northwest A&F Univ, Coll Agron, 3 Taicheng Rd, Yangling 712100, Shaanxi, Peoples R China

3.Gansu Acad Agr Sci, Crop Res Inst, Lanzhou 730070, Peoples R China

关键词： LuFAD2; LuFAD3; Fatty acid; Low temperature; Jasmonic acid; Anthocyanins

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2021 年 311 卷

页码：

收录情况： SCI

摘要： Flax (Linum usitatissimum) seed oil is rich in polyunsaturated fatty acids (PUFAs), particularly linolenic acid, which is converted from linoleic acid. Studies have indicated that the biosynthesis of linoleic acid and linolenic acid is controlled by FAD2 and FAD3, respectively. However, the functional distinctions of different LuFAD2 and LuFAD3 copies from L. usitatissimum in governing the biosynthesis of linoleic acid or linolenic acid, respectively, remain unclear. In this study, five LuFAD2 and three LuFAD3 cDNAs were cloned from the L. usitatissimum cultivar 'Longya 10', and GC-MS results demonstrated that LuFAD2A and LuFAD3A play predominant roles in the accumulation of linoleic acid and linolenic acid, respectively. Their simultaneous overexpression in Arabidopsis thaliana seeds led to a significant increase in fatty acid contents, especially PUFAs. Additionally, LuFAD2A and LuFAD3A promoted the biosynthesis of jasmonic acid by increasing the levels of linolenic acid, which, in turn, enhanced plant cold tolerance. When the amount of linolenic acid is not sufficient, plants adapt to low temperature via the accumulation of anthocyanins. These findings provide insights into the higher accumulation of PUFAs in L. usitatissimum seeds, and provide potential targets for improving oil quality of other oil-producing crops through molecular manipulation.

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