Abstract
Arsenic (As) is considered the most common toxic metalloid, but its molecular mode of action is not well understood. We investigated whether arsenate [As(V)] can induce intracellular reactive oxygen species production and calcium oscillation in rice roots. To better understand the molecular basis of plant cell responses to As, we performed a large-scale analysis of the rice transcriptome during As(V) stress. As(V) induced genes involved in abiotic stress, detoxification pathways and secondary metabolic process. Genes involved in secondary cell wall biogenesis, cell cycle and oligopeptide transport were mainly downregulated. Genes encoding signalling components such as receptor-like cytoplasmic kinases protein kinase, APETALA2/ethylene response factor, heat shock factor, MYB and zinc-finger protein expressed in inflorescence meristem transcription factors were increased in expression. The expression of GARP-G2-like and C3H transcription factors was specifically modulated by As(V) stress. The predominant families of As(V)-regulated transporters belonged to the ATP-binding cassette superfamily and telurite-resistance/dicarboxylate transporters. Several factors involved in signaling, such as mitogen-activated protein kinase (MAPK), MAPK kinase kinase and calcium-dependent protein kinase (CDPK), were also upregulated. Moreover, As(V) markedly increased the activity of MAPKs and CDPK-like kinases, and CDPK and NADPH oxidases were involved in As-induced MAPK activation. Further characterization of these As(V)-responsive genes and signalling pathways may help better understand the mechanisms of metalloid uptake, tolerance and detoxification in plants.
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Abbreviations
- ABA:
-
Abscissic acid
- ABC superfamily:
-
ATP-binding cassette superfamily
- AOX:
-
Alterative oxidase
- AP2/ERF:
-
APETALA2/ethylene response factor
- As:
-
Arsenic
- As(III):
-
Arsenite
- As(V):
-
Arsenate
- BGAL:
-
Beta-galactosidases
- Ca2+ :
-
Calcium
- CDK:
-
Cyclin-dependent kinase
- CDPK:
-
Ca2+-dependent protein kinase
- CK:
-
Cytokinin
- CM-H2DCF-DA:
-
5-(and-6)-Chloromethyl-2′,7′-dichlorodihydrofluorescein diacetate, acetyl ester
- CSL:
-
Beta-mannan synthase-like
- DHAR:
-
Dehydroascorbate reductase
- DPI:
-
Diphenylene iodonium
- EF1G:
-
Elongation factor 1 gamma
- FDR:
-
False discovery rate
- GA:
-
Gibberellin
- GH9:
-
Glycoside hydrolases 9
- GH28:
-
Polygalacturonases
- GO:
-
Gene ontology
- GR:
-
Glutathione reductase
- GT8:
-
Glycosyl transferases (pectin bios.)
- Grx:
-
Glutaredoxin
- GST:
-
Glutathione S-transferase
- HSF:
-
Heat shock factor
- ICP-AES:
-
Inductively coupled plasma-atmoic emission spectrometry
- JA:
-
Jasmonic acid
- MAPK:
-
Mitogen-activated protein kinase
- MAPKKK:
-
MAPK kinase kinase
- MBP:
-
Myelin basic protein
- MC family transporter:
-
Mitochondrial carrier family transporter
- MVA pathway:
-
Mevalonic acid pathway
- PCs:
-
Phytochelatins
- POT-family:
-
Proton-dependent oligopeptide transporter family
- Prx:
-
Class III peroxidase
- qRT-PCR:
-
Quantitative RT-PCR
- RLCK subfamily:
-
Receptor-like cytoplasmic kinases subfamily
- RLK family:
-
Receptor-like kinase family
- ROS:
-
Reactive oxygen species
- TCHQD:
-
Tetrachlorohydroquinone dehalogenase
- TDT:
-
Telurite-resistance/dicarboxylate
- TFs:
-
Transcription factors
- Trx:
-
Thioredoxin
- XGT:
-
Xyloglucan galactosyltransferases
- XTH:
-
Xyloglucan endotransglycosylases/hydrolases
- XXT:
-
Xyloglucan xylosyltransferases and galactomannan galactosyltransferases
- ZIM transcription factor:
-
Zinc-finger protein expressed in inflorescence meristem transcription factor
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Acknowledgments
This work was supported by research grants from NSC and Ministry of Eudcation. Microarray assays were performed by the DNA Microarray Core Laboratory at the Institute of Plant and Microbial Biology, Academia Sinica. Data mining performed at the Bioinformatics Core for Genomic Medicine and Biotechnology Development at NCKU, supported by NSC (97-3112-B-006-011). Furthermore, we thank Ms. Laura Smales (Canada) for English editing.
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Tsai-Lien Huang, Quynh Thi Thuy Nguyen contributed equally to this article.
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Huang, TL., Nguyen, Q.T.T., Fu, SF. et al. Transcriptomic changes and signalling pathways induced by arsenic stress in rice roots. Plant Mol Biol 80, 587–608 (2012). https://doi.org/10.1007/s11103-012-9969-z
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DOI: https://doi.org/10.1007/s11103-012-9969-z