Abstract
Drought is an important factor limiting plant development and crop production. Dissecting the factors involved in this process is the key for enhancement of plant tolerance to drought stress by genetic approach. Here, we evaluated the regulatory function of a novel rice ethylene response factor (ERF) OsERF109 in drought stress. Expression of OsERF109 was rapidly induced by stress and phytohormones. Subcellular localization and transactivation assay demonstrated that OsERF109 was localized in nucleus and possessed transactivation activity. Transgenic plants overexpressing (OE) and knockdown with RNA interfering (RI) OsERF109 exhibited significantly reduced and improved drought resistance, respectively, indicating that OsERF109 negatively regulates drought resistance in rice. Furthermore, measurement by gas chromatography showed that ethylene contents were less in OE while more in RI lines than these in wild types, supporting the data of drought tolerance and water loss in transgenic lines. Quantitative real-time PCR analysis also proved the regulation of OsERF109 in the expression of OSACS6, OSACO2, and OsERF3, which have been identified to play important roles in ethylene biosynthesis. Based on these results, our data evidence that OsERF109 regulates drought resistance by affecting the ethylene biosynthesis in rice. Overall, our study reveals the negative role of OsERF109 in ethylene biosynthesis and drought tolerance in rice.
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Abbreviations
- ABA:
-
Abscisic acid
- ABRE:
-
ABA-responsive elements
- ACC:
-
1-Aminocyclopropane-1-carboxylic acid
- AP2:
-
APETALA2
- CaMV:
-
Cauliflower mosaic virus
- cDNA:
-
DNA complementary to RNA
- CRT:
-
C-repeat
- DRE:
-
Dehydration responsive element
- DREB:
-
Dehydration responsive element binding factor
- ERF:
-
Ethylene response factor
- GA:
-
Gibberellic acid
- GFP:
-
Green fluorescent protein
- GUS:
-
β-Glucuronidase
- MS:
-
Murashige and Skoog
- MYBRS:
-
MYC recognition site
- MYCRS:
-
MYC recognition site
- qPCR:
-
Quantitative real-time polymerase chain reaction
- Trp:
-
Tryptophan
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Acknowledgments
This research was supported by the Major Special Foundation of Transgenic Plants in China (2014ZX08009-15B and 2013ZX08001003) and by National Natural Science Foundation of China (31171465).
Author Contribution
RH, JD, and DY conceived and designed the research. YY and DY conducted the experiments. RH, JD, JG, SZ and FW analyzed and discussed the data. YY wrote the manuscript. All authors read and approved the manuscript.
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Handling Editor: Bhumi Nath Tripathi
Yanwen Yu and Dexin Yang contributed equally to this work.
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Fig. S1
The knockdown of OsERF109 in RI lines did not interfere the expression of its homologous genes. (a) The comparison of the C terminus with its homologous genes by DNAMAN software, which was used to the interference of OsERF109 transcription. (b) The expression of OsERF109 and homologous genes in RI transgenic lines. Transcripts are indicated relative to the expression level of the wild type Nip and error bars (± SD) are according to three independent biological experiments. (PDF 414 kb)
Fig. S2
Transgenic lines overexpression or knockdown of OsERF109 did not affect the growth at mature stage. Transgenic lines of 4-month-old rice grew in paddy field did not show obvious different phenotypes with the corresponding wild types. The OE-95 and RI-20 were selected from the paddy field to take photos with the corresponding wild type Zh17 and Nip, respectively. (PDF 165 kb)
Table S1
The primers used in this study. (PDF 173 kb)
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Yu, Y., Yang, D., Zhou, S. et al. The ethylene response factor OsERF109 negatively affects ethylene biosynthesis and drought tolerance in rice. Protoplasma 254, 401–408 (2017). https://doi.org/10.1007/s00709-016-0960-4
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DOI: https://doi.org/10.1007/s00709-016-0960-4