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Short Communication | Open Access

Overexpression of a BRASSINAZOLE RESISTANT 1 homolog attenuates drought tolerance by suppressing the expression of PLETHORA-LIKE 1 in Setaria italica

Zhiying Zhaoa, Sha Tangb, Wei Lic, Xiaorui Yangd, Ruiju Wanga, Xianmin Diaob,c( ), Wenqiang Tanga( )
Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaboration Innovation Center for Cell Signaling, Hebei Key Laboratory of Molecular and Cellular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050024, Hebei, China
Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Foxtail Millet Improvement Center of China, Institute of Millet Crops, Hebei Academy of Agricultural and Forestry Science, Shijiazhuang 050031, Hebei, China
College of Bioscience & Bioengineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
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Abstract

Two potential BRASSINAZOLE RESISTANT 1 (BZR1) homologs were downregulated by brassinosteroids (BRs) in Setaria italica roots. Functional analysis showed that BR regulates the dephosphorylation and nuclear localization of SiBZR1 and that SiBZR1 binds conserved BZR1-recognizing cis elements. In comparison with the wild type, SiBZR1-overexpressing S. italica seedlings were more sensitive to BR-inhibited primary root growth and drought stress, indicating that SiBZR1 is a positive regulator of BR signaling and a negative regulator of drought tolerance in S. italica. PLETHORA-LIKE 1 (SiPLT-L1) was found to be a direct target gene of SiBZR1 in S. italica roots. The expression of SiPLT-L1 was downregulated by SiBZR1. SiPLT-L1-overexpressing S. italica was less sensitive to BR-inhibited root growth and more tolerant to drought stress, possibly owing to the upregulation of drought-inducible Dehydrin-family genes.

Keywords

Foxtail milletDrought toleranceBrassinosteroidsSiBZR1SiPLT-L1

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The Crop Journal
Volume 9 Issue 5,
October 2021
Pages 1208-1213
DOI: 10.1016/j.cj.2021.02.006
Cite this article:
Zhao Z, Tang S, Li W, et al. Overexpression of a BRASSINAZOLE RESISTANT 1 homolog attenuates drought tolerance by suppressing the expression of PLETHORA-LIKE 1 in Setaria italica. The Crop Journal, 2021, 9(5): 1208-1213. https://doi.org/10.1016/j.cj.2021.02.006

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Received: 29 November 2020
Revised: 21 January 2021
Accepted: 17 March 2021
Published: 26 March 2021
© 2021 Crop Science Society of China and Institute of Crop Science, CAAS

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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