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Transcriptome Analysis Identifies Two Ethylene Response Factors That Regulate Proanthocyanidin Biosynthesis During
Hua Li1,2, Mingzheng Han1,2, Lujia Yu1,2
1Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing, China.
Frontiers in Plant Science
|March 13, 2020
Summary
This study identifies two key transcription factors, RAP2-4 and RAV1, that regulate proanthocyanidin (PA) biosynthesis in crabapple. RAP2-4 promotes PA production, while RAV1 represses it, revealing insights into the ethylene-PA regulatory network.
Area of Science:
- Plant Molecular Biology
- Biochemistry
- Genetics
Background:
- Proanthocyanidins (PAs) are vital plant compounds involved in defense and human health.
- Understanding PA biosynthesis regulation is crucial for improving plant traits.
- Crabapple (Malus) serves as a model for studying PA metabolism.
Purpose of the Study:
- To elucidate the regulatory network of proanthocyanidin (PA) biosynthesis in Malus plants.
- To identify key transcription factors involved in PA accumulation during fruit development.
- To investigate the role of ethylene signaling in PA regulation.
Main Methods:
- RNA-sequencing (RNA-seq) profiling of crabapple fruits at five developmental stages.
- KEGG enrichment analysis to identify enriched functional categories.
- Weighted Gene Co-expression Network Analysis (WGCNA) to identify co-expressed genes.
- Quantitative Real-Time PCR (qRT-PCR) for gene expression validation.
- Agrobacterium-mediated transient overexpression assays.
- Yeast one-hybrid assays for promoter binding analysis.
Main Results:
- Plant hormone signal transduction pathways, particularly ethylene signaling (ERS, EIN3, ERFs), were significantly enriched.
- Twelve differentially expressed genes (DEGs) associated with PA biosynthesis were identified, including 10 ERFs, 1 MYB, and 1 bHLH.
- RAP2-4 (an inducer) and RAV1 (a repressor) showed strong correlations with PA accumulation.
- Overexpression of RAP2-4 increased PA levels, while RAV1 overexpression decreased them.
- RAP2-4 and RAV1 directly bound the promoters of PA biosynthetic genes McLAR1 and McANR2, respectively.
Conclusions:
- RAP2-4 and RAV1 are identified as key regulators of PA biosynthesis in Malus.
- RAP2-4 acts as an inducer, and RAV1 acts as a repressor of PA production.
- This study provides novel insights into the ethylene-mediated regulatory network controlling PA biosynthesis.
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