Abstract
The plastidic thioredoxin F-type (TrxF) protein plays an important role in plant carbohydrate metabolism biosynthesis. In this study, a gene encoding the TrxF protein, named GmTrxF, was isolated from soybean. The open reading frame (ORF) contained 540 nucleotides encoding 179 amino acids. The coding region of GmTrxF was cloned into a binary vector under the control of 35S promoter and then transformed into Arabidopsis. The starch content in GmTrxF expressing plants was increased by 57–109% compared to that in wild-type (WT). Real-time quantitative PCR (qRT-PCR) analysis showed that constitutive expression of GmTrxF up-regulated the expression of phosphoglucomutase (AtPGM), ADP-glucose pyrophosphorylase (AGPase) small subunit (AtAGPase-S1 and AtAGPase-S2), AGPase large subunit (AtAGPase-L1 and AtAGPase-L2) and soluble starch synthases (AtSSS I, AtSSS II, AtSSS III and AtSSS IV) genes involved in starch biosynthesis in the transgenic Arabidopsis plants. Meanwhile, enzymatic analyses showed that the major enzymes (AGPase and SSS) involved in the starch biosynthesis exhibited higher activities in the transgenic plants compared to WT. These results suggest that GmTrxF may improve starch content of Arabidopsis by up-regulating the expression of the related genes and increasing the activities of the major enzymes invovled in starch biosynthesis. The manipulation of GmTrxF expression might be used for increasing starch accumulation of plants in the future.
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Acknowledgements
This work was supported by the Natural Science Research Project in Colleges of Jiangsu Province of China (17KJB210001), the Natural Science Foundation of Jiangsu Province of China (BK2013256), the Support Project of Jiangsu Provincial Department of Agriculture (BE2012445), the College Student Practice Innovation Program of Jiangsu Province of China (201711049009H and 201716021YJ) and the Talent Introduction Research Project of Huaiyin Institute of Technology (Z301B16534).
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Wang, F., Chen, X., Ye, Y. et al. Enhancement of starch content by constitutive expression of GmTrxF in transgenic Arabidopsis . Plant Growth Regul 84, 351–358 (2018). https://doi.org/10.1007/s10725-017-0346-4
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DOI: https://doi.org/10.1007/s10725-017-0346-4