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Functional analyses of Populus euphratica brassinosteroid biosynthesis enzyme genes DWF4 (PeDWF4) and CPD (PeCPD) in the regulation of growth and development of Arabidopsis thaliana

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Abstract

DWF4 and CPD are key brassinosteroids (BRs) biosynthesis enzyme genes. To explore the function of Populus euphratica DWF4 (PeDWF4) and CPD (PeCPD), Arabidopsis thaliana transgenic lines (TLs) expressing PeDWF4, PeCPD or PeDWF4 plus PeCPD, namely PeDWF4-TL, PeCPD-TL and PeCP/DW-TL, were characterized. Compared with wild type (WT), the changes of both PeDWF4-TL and PeCPD-TL in plant heights, silique and hypocotyls lengths and seed yields were similar, but in bolting time and stem diameters, they were opposite. PeCP/DW-TL was more in plant heights and the lengths of primary root, silique, and fruit stalk, but less in silique numbers and seed yields than either PeDWF4-TL or PeCPD-TL. PeDWF4 and PeCPD specially expressed in PeDWF4-TL or PeCPD-TL, and the transcription level of PeDWF4 was higher than that of PeCPD. In PeCP/DW-TL, their expressions were all relatively reduced. Additionally, the expression of PeDWF4 and PeCPD differentially made the expression levels of AtDWF4, AtCPD, AtBR6OX2, AtFLC, AtTCP1 and AtGA5 change in the TLs. The total BRs contents were PeDWF4-TL > PeCP/DW-TL > WT > PeCPD-TL. These results imply that PeDWF4 is functionally not exactly the same as PeCPD and there may be a synergistic and antagonistic effects in physiology between both of them in the regulation of plant growth and development.

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Acknowledgements

This study is supported by the National Natural Science Foundation of China (No. 30971549 and No. 31071178).

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  1. Key Laboratory of Plant Cell Activities and Stress Adaptation, Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China

    Jianping Si, Yan Sun, Lu Wang, Ying Qin, Chongying Wang & Xinyu Wang

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  1. Jianping Si
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Correspondence to Xinyu Wang.

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[Si J, Sun Y, Wang L, Qin Y, Wang C and Wang X 2016 Functional analyses of Populus euphratica brassinosteroid biosynthesis enzyme genes DWF4 (PeDWF4) and CPD (PeCPD) in the regulation of growth and development of Arabidopsis thaliana. J. Biosci.]

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Si, J., Sun, Y., Wang, L. et al. Functional analyses of Populus euphratica brassinosteroid biosynthesis enzyme genes DWF4 (PeDWF4) and CPD (PeCPD) in the regulation of growth and development of Arabidopsis thaliana . J Biosci 41, 727–742 (2016). https://doi.org/10.1007/s12038-016-9635-8

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