Abstract
Key message
A genome-wide investigation identified five B. distachyon ASR genes. BdASR1 may be a transcription factor that confers drought resistance by activating antioxidant systems involving ROS-scavenging enzymes and non-enzymatic antioxidants.
Abstract
Abscisic acid-, stress-, and ripening-induced (ASR) proteins belong to a family of plant-specific, small, and hydrophilic proteins with important roles in responses to abiotic stresses. Although several ASR genes involved in drought tolerance have been characterized in various plant species, the mechanisms regulating ASR activities are still uncharacterized. Additionally, no research on Brachypodium distachyon ASR proteins have been completed. In this study, five B. distachyon BdASR genes were identified through genome-wide analyses. Phylogenetic analyses revealed that BdASR genes originated from tandem and whole genome duplications. Expression analyses revealed the BdASR genes responded to various abiotic stresses, including cold, drought, and salinity, as well as signaling molecules such as abscisic acid, ethylene, and H2O2. BdASR1, which localizes to the nucleus and is transcriptionally active, was functionally characterized. BdASR1 overexpression considerably enhanced drought tolerance in transgenic tobacco plants, which was accompanied by increased superoxide dismutase, catalase, and peroxidase activities, as well as an increased abundance of antioxidants such as ascorbate, tocopherols, and glutathione. BdASR1 may function as a transcription factor that provides drought stress resistance by inducing the production of reactive oxygen species-scavenging enzymes and non-enzymatic antioxidants.
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Acknowledgments
This work was supported by National Genetically Modified New Varieties of Major Projects of China (Grant no. 2016ZX08010004-004, International S & T Cooperation Key Projects of MoST (Grant no. 2009DFB30340), Research Fund for the Doctoral Program of Higher Education of China (Grant no. 2012014211075) and Open Research Fund of State Key Laboratory of Hybrid Rice in Wuhan University (Grant no. KF201302).
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Communicated by H. S. Judelson.
Lianzhe Wang, Wei Hu, Jialu Feng contributed equally to this work.
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299_2016_1954_MOESM2_ESM.jpg
Organ-specific expression patterns of BdASR genes. Relative expressions of BdASR genes were analyzed in roots, stems, leaves and spikelets by RT-qPCR. BdUBC18 was used as an internal control. Normalized mRNA levels in roots were set to 1, and fold changes were used to indicate the transcript level. In addition, as BdASR5 had almost no detectable expression in roots, the expression in spikelets was set to 1. Data are means ± SD calculated from three replicates. (JPEG 110 kb)
299_2016_1954_MOESM3_ESM.tif
Expression of BdASR1 in transgenic tobacco lines. Expression of BdASR1 in WT, VC and three independent transgenic lines (OE8, OE9 and OE12) with RT-PCR. NtActin was used as an internal control. (TIFF 128 kb)
299_2016_1954_MOESM4_ESM.jpg
Data of unchanged antioxidant enzyme activity and antioxidants levels under drought and oxidative stresses. (A) CAT activity under drought stress. (B) SOD activity under oxidative stress. (C) V E content under oxidative stress. The indices were measured in controls and transgenic lines under normal, drought and oxidative stresses. Data are means ± SD calculated from three replicates. Significant differences between the OE and control lines are indicated as *P < 0.05; **P < 0.01. (JPEG 266 kb)
299_2016_1954_MOESM5_ESM.jpg
Expression levels of NtLEA5, NtGMP and NtGSH2 genes of transgenic lines under normal, hyperosmotic and MV treatments. One-week-old seedlings were subjected to normal, hyperosmotic and MV treatments for one week and then used for RT-qPCR. NtActin was used as an internal control. Fold changes were used to indicate relative expression levels between WT and transgenic lines. Data are means ± SD calculated from three replicates. Significant differences between the OE and control lines are indicated as *P < 0.05; **P < 0.01. (JPEG 172 kb)
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Wang, L., Hu, W., Feng, J. et al. Identification of the ASR gene family from Brachypodium distachyon and functional characterization of BdASR1 in response to drought stress. Plant Cell Rep 35, 1221–1234 (2016). https://doi.org/10.1007/s00299-016-1954-6
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DOI: https://doi.org/10.1007/s00299-016-1954-6