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A miRNA-Encoded Small Peptide, vvi-miPEP171d1, Regulates Adventitious Root Formation
Qiu-Ju Chen1, Bo-Han Deng1, Jie Gao1
1Department of Plant Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
Plant Physiology
|April 4, 2020
Summary
A novel peptide, vvi-miPEP171d1, significantly enhances adventitious root formation in grapevine by boosting primary miRNA transcription. This discovery offers new insights into grapevine propagation and microRNA-encoded peptide functions.
Area of Science:
- Plant Molecular Biology
- Agricultural Science
- Biotechnology
Background:
- Clonal propagation of grapevine (Vitis vinifera) is hindered by rooting difficulties.
- The molecular mechanisms governing adventitious root initiation and development in grapevine are not well understood.
- MicroRNA-encoded peptides (miPEPs) are known to influence plant root development by regulating primary miRNA transcription.
Purpose of the Study:
- To investigate the role of miPEPs in promoting adventitious root formation in grapevine.
- To characterize the function of vvi-miPEP171d1, a peptide encoded by primary-miR171d.
- To explore the species-specific effects of miPEPs on root development.
Main Methods:
- Global analysis of miPEPs in grapevine.
- Identification and characterization of vvi-miPEP171d1 from the pre-miR171d sequence.
- Exogenous application of vvi-miPEP171d1 to grapevine plantlets.
- Phenotypic analysis in grapevine and Arabidopsis thaliana, including overexpression studies.
Main Results:
- vvi-miPEP171d1 was identified as a functional peptide encoded by pre-miR171d.
- Exogenous application of vvi-miPEP171d1 promoted adventitious root development in grapevine by activating vvi-MIR171d expression.
- vvi-miPEP171d1 and its Arabidopsis ortholog ath-miPEP171c exhibited species-specific effects on root development, with no phenotypic changes observed in Arabidopsis for vvi-miPEP171d1.
Conclusions:
- vvi-miPEP171d1 plays a crucial role in enhancing adventitious root formation in grapevine.
- The regulatory mechanism involves the activation of vvi-MIR171d expression.
- miPEP171d1's function in root development is species-specific, highlighting the complexity of miPEP signaling pathways.
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