Production of arachidonic and eicosapentaenoic acids in plants using bryophyte fatty acid Delta6-desaturase, Delta6-elongase, and Delta5-desaturase genes |
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Authors: | Kajikawa Masataka Matsui Keisuke Ochiai Misa Tanaka Yoshikazu Kita Yoichi Ishimoto Masao Kohzu Yoshito Shoji Shin-ichiro Yamato Katsuyuki T Ohyama Kanji Fukuzawa Hideya Kohchi Takayuki |
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Institution: | Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Japan. |
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Abstract: | The liverwort Marchantia polymorpha L. synthesizes arachidonic (ARA) and eicosapentaenoic acids (EPA) from linoleic and alpha-linolenic acids respectively by a series of reactions catalyzed by Delta6-desaturase, Delta6-elongase, and Delta5-desaturase. Overexpression of the M. polymorpha genes encoding these enzymes in transgenic M. polymorpha plants resulted in 3- and 2-fold accumulation of ARA and EPA respectively, as compared to those in the wild type. When these three genes were introduced and co-expressed in tobacco plants, in which long-chain polyunsaturated fatty acids (LCPUFAs) are not native cellular components, ARA and EPA represented up to 15.5% and 4.9% respectively of the total fatty acid in the leaves. Similarly in soybean, C20-LCPUFAs represented up to 19.5% of the total fatty acids in the seeds. These results suggest that M. polymorpha can provide genes crucial to the production of C20-LCPUFAs in transgenic plants. |
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