Abstract
Key message
A novel rice constitutive promoter (P OsCon1 ) was isolated. The molecular mechanism of the promoter activity was investigated. P OsCon1 could be used as an alternative constitutive promoter for crop transgenic engineering.
Abstract
Monocot constitutive promoter is an important resource for crop transgenic engineering. In this report, we isolated a novel promoter, Oscon1 promoter (P OsCon1 ), from the 5′ upstream region of a constitutively expressed rice gene OsDHAR1. In P OsCon1 ::GUS transgenic rice, we showed that P OsCon1 had a broad expression spectrum in all tested tissues. The expression of the promoter was further analyzed in comparison with the previously characterized strong constitutive promoters. P OsCon1 exhibited comparable activity to OsCc1, OsAct1 or ZmUbi promoters in most tissues, and more active than 35S promoter in roots, seeds, and calli. Further quantitative assays indicated that P OsCon1 activity was not affected by developmental stages or by environmental factors. Further, 5′-deletions analysis indicated that the distinct regions might contribute to the strong expression of P OsCon1 in different tissues. Overall, our results suggest that P OsCon1 is a novel constitutive promoter, which could potentially use in transgenic crop development.
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Abbreviations
- P OsCon1 :
-
Rice constitutive promoter 1
- P OsAct1 :
-
Rice Actin1 promoter
- P 35S :
-
Cauliflower mosaic virus 35S promoter
- P ZmUbi :
-
Maize ubiquitin promoter
- P OsCc1 :
-
Rice OsCc1 promoter
- DHAR:
-
Dehydroascorbate reductase
- GUS:
-
β-Glucuronidase
- qRT-PCR:
-
Quantitative reverse transcription polymerase chain reaction
- MS:
-
Murashige and Skoog
- X-Gluc:
-
5-Bromo-4-chloro-3-indolyl-beta-glucuronide
- 4-MU:
-
4-Methylumbelliferone
- DAG:
-
Days after germination
- ASF1:
-
Activating sequence factor 1
- ASF2:
-
Activating sequence factor 2
- EEC:
-
Enhancer element consensus
- CGF1:
-
Chlorophyll a/b-binding protein gene GATA-box factor 1
- DHA:
-
Dehydroascorbate
- cytDHAR:
-
Cytosolic DHAR
- AsA:
-
Ascorbate acid
- ROS:
-
Reactive oxygen species
- SD:
-
Standard deviation
- GAP:
-
Glyceraldydyde-3-phosphate dehydrogenase
- CAB:
-
Chlorophyll A/B binding protein
- RBCS:
-
Ribulose bisphosphate carboxylase
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Acknowledgments
We thank Dr. Changlin Wang (Washington State University) for help with the manuscript. This research was supported by the National Natural Science Foundation of China (NSFC Grant No. 31100216) and by the Creative Foundation of the Anhui Agricultural Academy of Sciences (13C0101 & 14B0113).
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The authors declare that they have no conflict of interest.
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Communicated by Huw D. Jones.
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Li, J., Xu, RF., Qin, RY. et al. Isolation and functional characterization of a novel rice constitutive promoter. Plant Cell Rep 33, 1651–1660 (2014). https://doi.org/10.1007/s00299-014-1644-1
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DOI: https://doi.org/10.1007/s00299-014-1644-1