Abstract
Drought tolerance varies considerably in different species of Populus, and is a complex trait, involving the interplay of a vast array of genes. Although Populus simonii is one of the most important commercial plantation tree species in China, genes controlling drought-stress tolerance in this organism have not yet been identified. Here, transcriptomic changes during drought stress in P. simonii were detected using an Affymetrix GeneChip. In total, 1,028 transcripts were identified as differentially expressed under drought stress, of which 496 transcripts increased and 532 decreased in abundance (two-way ANOVA, fold change >4 and P < 0.01). Expression changes of 20 candidate genes were validated by real-time PCR, indicating significant differences between the controls and water-deficit treatments. Gene annotation demonstrated that the majority of these P. simonii genes encode products involved in phytohormone metabolism, osmoregulation, and oxidative stress. Based on gene ontology (GO) classification, the increased genes were classified into six significantly enriched GO terms involved in 64 pathways, and the decreased genes were classified into 39 significantly enriched GO terms representing 42 pathways. Bioinformatics analysis showed that the differential expression of plant hormone-related, transcription factor, cytochrome P450 gene superfamily, carbohydrate metabolism, and amino acid transporter genes may contribute to drought-stress tolerance in P. simonii. Our study provides global gene expression patterns during drought stress and will be valuable for further study of the molecular mechanisms of drought tolerance in P. simonii.
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Abbreviations
- ABA:
-
Abscisic acid
- IAA:
-
Indole-3-acetic acid
- JGI:
-
Joint Genome Institute
- TAIR:
-
The Arabidopsis information resource
- qRT-PCR:
-
Real-time quantitative reverse transcription PCR
- GO:
-
Gene Ontology
- HSP:
-
Heat shock protein
- TF:
-
Transcription factor
- EL:
-
Electrolyte leakage
- POD:
-
Peroxidase
- MDA:
-
Malondialdehyde
- PAL:
-
Phenylalanine ammonia lyase
- FC:
-
Fold change
- D:
-
Water-deficit treatment
- CK:
-
Control
- DEGs:
-
Differentially expressed genes
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Acknowledgments
This work was supported by grants from the following sources: the Forestry Public Benefic Research Program (No. 201204306), Project of the National Natural Science Foundation of China (No. 30600479, 30872042), Program for New Century Excellent Talents in University (No. NCET-07-0084).
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All samples were uploaded to Gene Expression Omnibus (http://www.ncbi.nlm.nih.ov/geo/) accession number GSE37608.
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Chen, J., Song, Y., Zhang, H. et al. Genome-Wide Analysis of Gene Expression in Response to Drought Stress in Populus simonii . Plant Mol Biol Rep 31, 946–962 (2013). https://doi.org/10.1007/s11105-013-0563-6
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DOI: https://doi.org/10.1007/s11105-013-0563-6