Related Experiment Video
Updated: Dec 15, 2025
11:33
Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
Published on: October 14, 2022
1.9K
Physiological Importance of Pectin Modifying Genes During Rice Pollen Development
Yu-Jin Kim1, Ho Young Jeong2, Seung-Yeon Kang1
1Graduate School of Biotechnology & Crop Biotech Institute, Kyung Hee University, Yongin 17104, Korea.
International Journal of Molecular Sciences
|July 12, 2020
Summary
Homogalacturonan (HGA) modification is crucial for rice pollen tube growth. Manipulating pectin methylesterase (PME) and PME inhibitors (PMEIs) severely impacted germination and elongation, highlighting their regulatory role.
Area of Science:
- Plant reproductive biology
- Cell wall biochemistry
- Molecular genetics
Background:
- Pollen tube growth is vital for plant fertilization.
- Cell wall dynamics, specifically pectin modification (homogalacturonan, HGA), are critical in dicots but less understood in monocots.
- The role of HGA modification in regulating rice pollen tube elongation remains largely unexplored.
Purpose of the Study:
- To investigate the role of HGA modification in rice pollen tube germination and elongation.
- To determine the impact of pectin methylesterase (PME) and PME inhibitor (PMEI) activity on pollen tube development in rice.
Main Methods:
- In vitro germination assays with exogenous PME enzyme or PME-inhibiting catechin extract (Polyphenon 60).
- Immunofluorescence microscopy using monoclonal antibodies against methyl-esterified and de-esterified HGA epitopes.
- Bioinformatic analysis of transcriptome datasets to identify PME and PMEI genes, followed by qRT-PCR validation.
- Enzyme activity assays and subcellular localization studies of identified PMEs and PMEIs.
Main Results:
- Both PME and Polyphenon 60 treatments significantly reduced rice pollen germination and tube elongation rates.
- Exogenous PME and Polyphenon 60 disrupted the distribution patterns of differently methylated HGA epitopes during pollen germination and tube growth.
- Eleven PMEs and 13 PMEIs were identified in rice pollen, with validated specific expression patterns.
- Some pollen-specific PMEs and PMEIs exhibited distinct enzymatic activities and targeted specific cellular compartments.
Conclusions:
- Homogalacturonan (HGA) methyl-esterification status is essential for rice pollen germination and tube elongation.
- The fine-tuning of pectin methylesterase (PME) and PME inhibitor (PMEI) activities is the primary mechanism governing HGA modification during rice pollen development.
- These findings provide the first evidence for the critical role of HGA modification in monocot pollen tube growth.
Related Concept Videos
01:15Cellulose and Pectic Polysaccharides
4.4K
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
As a cell matures, its cell wall specializes according to its type. For example, the...
4.4K
01:17Gene Regulation During Sporulation
335
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
335
01:14Cell Adhesion in Plants
3.1K
Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
3.1K