Transcriptome profiling reveals regulatory mechanisms underlying corolla senescence in petunia
Hong Wang1,2, XiaoXiao Chang3, Jing Lin1
11Institute of Pomology/Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Jiangsu Academy of Agricultural Sciences, 210014 Nanjing, China.
Horticulture Research
|April 6, 2018
Summary
Petunia flower senescence involves complex genetic regulation. Key plant hormones, auxin and ethylene, interact to control corolla aging, influencing flower longevity.
Area of Science:
- Plant Biology
- Molecular Genetics
- Biochemistry
Background:
- Natural corolla senescence in petunia, a key ornamental plant, is poorly understood at the genetic level.
- Identifying the regulatory mechanisms is crucial for understanding flower development and improving crop longevity.
Purpose of the Study:
- To elucidate the genetic and molecular pathways governing natural corolla senescence in petunia.
- To identify key genes and hormone signaling pathways involved in flower aging.
Main Methods:
- Transcriptome analysis of petunia corolla across four developmental stages (D0, D2, D4, D7).
- KEGG pathway analysis to identify enriched biological pathways.
- Ethylene emission measurements.
- Virus-induced gene silencing (VIGS) for functional gene analysis.
Main Results:
- Identified thousands of differentially expressed genes (DEGs) during senescence.
- Auxin and ethylene biosynthesis and signaling pathways were significantly activated, particularly at the onset of senescence.
- Ethylene emission increased significantly during later stages of senescence.
- Key transcription factors (TFs) including ERF, ARF, bHLH, HB, and MADS-box were activated and their silencing affected flower longevity.
Conclusions:
- Hormonal interactions between auxin and ethylene are critical regulators of natural corolla senescence in petunia.
- Specific transcription factors play significant roles in modulating flower longevity during senescence.
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