Abstract
In this study, we successfully expressed the active 1Ay subunit of Triticum urartu in barley by Agrobacterium-mediated transformation with a transformation efficiency of 19.9%. The results of SDS–PAGE revealed that the expressed proteins of 1Ay subunit were present at some grains of each of 46 original T0 plants, showing identical mobility to those of positive standards of T. urartu grain protein and bacteria expressional proteins. In the T2 generation, three homozygous lines, 2–28, 3–11, and 5–6, were identified. The results of scanning electron microscopy showed an increased amount of protein bodies in these transgenic lines. The main effects in the expression of the 1Ay subunits was a considerable increase in the glutenin content, but a decrease in the contents of gliadins while there were no effects in the contents of albumin, globulin and the total protein. We found that the gluten could not be washed out from the flour obtained from transgenic barley lines when using a Gluten index analyzer and a Farinograph indicating that the transgenic barley lines could not form dough. The lack of x-type HMW-GS and the reduction in number of subunit were inferred as the possible reasons for the inability to form gluten polymer.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2016YFD0100100), the Key Research and Development Program of Sichuan Province (2018NZDZX0002), the International Science and Technology Cooperation project of Sichuan Province, China (2016HH0057).
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YQ carried out the experiments and wrote the draft; LSY did the barley transformation; LXY and MJ finished the SDS–PAGE detection; WJR and QPF designed the plant expression vector; CGY, PZE and LW extracted DNA for the experiment and finished the PCR detection; Wendy Harwood guided the barley transformation; LZY conducted data analysis; DM did the qRT-PCR; LXJ and LZX contributed to Southern blotting; WYM reviewed the manuscript; ZYL contributed to the improvement of the research program; JQT revised the manuscript and conducted data analysis. All authors read and approved the final manuscript.
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Supplementary Fig.
1. Barley transformation. a The immature grains for embryo isolation. b Isolated immature embryo. c Induction of embryogenic callus. d Regeneration of transgenic shoots. e Rooting of transgenic plants. f A T0 plant in soil. g Transgenic barley growing in greenhouse. h Gus staining of transgenic lines (right) compared to non-transgenic controls (left). (TIFF 879 kb)
Supplementary Fig.
2. PCR analysis of the transgenic barley T0 plants. Lanes 1 to 9 represent some of the transgenic barley lines; the CK- indicates the genomic DNA of non-transgenic barley ‘Golden promise’, and the CK + indicates the plasmid DNA of pCAMBIA1302-Glu-D1-1Ay. (TIFF 213 kb)
Supplementary Fig.
3. Scanning electron microscopy images of dried barley grains. a donor barley ‘Golden promise’; b transgenic barley line 2-28; c transgenic barley line 3-11; d transgenic barley line 5-6. Yellow arrows: large starch granule A type. Blue arrows: B type starch granule. Red arrows: protein matrices. Bars indicating 20 um are shown on each micrograph. (TIFF 758 kb)
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Yang, Q., Li, S., Li, X. et al. Expression of the high molecular weight glutenin 1Ay gene from Triticum urartu in barley. Transgenic Res 28, 225–235 (2019). https://doi.org/10.1007/s11248-019-00117-6
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DOI: https://doi.org/10.1007/s11248-019-00117-6