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Updated: Jul 11, 2025

Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

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Published on: July 23, 2014

Blocking miR528 function promotes tillering and regrowth in switchgrass.

Xiangyan Han^1,2, Shanjie Tang^2,3, Xuan Ma⁴

¹Department of Plant Biology and Ecology, Tianjin Key Laboratory of Protein Sciences, College of Life Sciences, Nankai University, Tianjin, China.

Plant Biotechnology Journal

|November 6, 2023

Summary

This summary is machine-generated.

MicroRNAs (miRNAs) regulate plant growth. In switchgrass, miR528 controls biomass by affecting tillering and regrowth, offering a new target for crop improvement.

Keywords:

ROS Switchgrass (Panicum virgatum L.)biomass miR528

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Area of Science:

Plant molecular biology
Genetics
Biotechnology

Background:

MicroRNAs (miRNAs) are crucial regulators of biological processes in plants.
The function of miRNAs in switchgrass (Panicum virgatum), a key biofuel and forage crop, remains largely unexplored.
miR528 is present in four copies in switchgrass.

Purpose of the Study:

To elucidate the function of miR528 in switchgrass.
To investigate the role of miR528 in controlling biomass traits, specifically tillering and regrowth.
To identify miR528 targets involved in biomass regulation.

Main Methods:

Expression of short tandem target mimic (STTM) to block miR528 activity.
Generation and analysis of quadruple pvmir528 mutant lines using genome editing.
Degradome sequencing and RNA sequencing (RNA-seq) to identify targets.
In situ hybridization to determine target localization.

Main Results:

Blocking miR528 activity or creating pvmir528 mutants enhanced tiller number and regrowth rate after mowing.
Up-regulation of two miR528 target genes encoding Cu/Zn-SOD enzymes was observed in mutants.
Natural variations in the miR528-SOD interaction were found across monocot species.

Conclusions:

miR528 plays a novel role in regulating switchgrass biomass traits.
The miR528-Cu/Zn-SOD module is a potential target for genetic manipulation to improve crop biomass.
Distinct regulatory roles of this module evolved during monocot diversification.