Abstract
Transgenic plants of Artemisia annua L., a medicinal plant that produces the compound artemisinin which has an anti-malarial activity, were developed following Agrobacterium tumefaciens-mediated transformation of leaf explants. A. tumefaciens strain EHA105 carrying either pCAMBIA1301 or pCAMBIAFPS was used. Both plasmids harbored the hygromycin phosphotransferase II (hptII) gene as a selectable gene, but the latter plasmid also harbored the gene encoding for farnesyl pyrophosphate synthase (FPS), a key enzyme for artemisinin biosynthesis. Shoot regeneration was observed either directly from leaf sections or via intervening callus when explants were incubated on solidified Murashige and Skoog (MS) (1962) medium containing 0.1 mg l−1 α-naphthaleneacetic acid (NAA), 1 mg l−1 N6-benzyladenine (BA), 30 mg l−1 meropenem and 10 mg l−1 hygromycin. Applying vacuum infiltration dramatically increased transformation efficiency up to 7.3 and 19.7% when plasmids with and without FPS gene were used, respectively. All putative transgenic regenerants showed positive bands of hptII gene following Southern blot analysis. Expression of FPS was observed in all transgenic lines, and FPS over-expressed lines exhibited higher artemisinin content and yield, of 2.5- and 3.6-fold, respectively, than that detected in wild-type plants. A relatively high correlation (R 2 = 0.78) was observed between level of expression of FPS and artemisinin content. However, gene silencing was detected in some transgenic lines, especially for those lines containing two copies of the FPS transgene, and with some lines exhibiting reduced growth.
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Abbreviations
- FPS :
-
Farnesyl pyrophosphate synthase gene
- GUS:
-
β-glucuronidase
- hptII:
-
Hygromycin phosphotransferase gene
- NAA:
-
α-naphthaleneacetic acid
- BA:
-
N6-benzyladenine
- PGR:
-
Plant growth regulators
- FW:
-
Fresh weight
- DW:
-
Dry weight
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Acknowledgments
This research work was supported by a Mahidol University grant, Thailand. The authors would like to thanks the scholarship from The Royal Golden Jubilee PhD Program (RGJ) of the Thailand Research Fund and partial support from Graduate Institute of Science and Technology (TGIST). This work is under the collaboration of Mahidol University and Chiba University for double degree program.
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Banyai, W., Kirdmanee, C., Mii, M. et al. Overexpression of farnesyl pyrophosphate synthase (FPS) gene affected artemisinin content and growth of Artemisia annua L.. Plant Cell Tiss Organ Cult 103, 255–265 (2010). https://doi.org/10.1007/s11240-010-9775-8
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DOI: https://doi.org/10.1007/s11240-010-9775-8