Lipopolysaccharides and plant innate immunity
1Department of Plant Biology and Biotechnology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg, Denmark.
Sub-Cellular Biochemistry
|July 2, 2010
Summary
Plants use microbe-associated molecular patterns (MAMPs), like lipopolysaccharides (LPS), to trigger immune defenses. The syntaxin PEN1 may play a role in LPS perception and plant defense signaling.
Area of Science:
- Plant immunity
- Microbe-associated molecular patterns (MAMPs)
- Plant-microbe interactions
Background:
- Plants possess innate immune systems analogous to mammals and insects.
- Microbe-associated molecular patterns (MAMPs) from microbes trigger plant basal defense responses.
- Lipopolysaccharides (LPS) from Gram-negative bacteria are known MAMPs.
Purpose of the Study:
- To investigate the role of lipopolysaccharides (LPS) in plant defense.
- To explore the mechanism of LPS perception in plants.
- To identify potential plant receptors involved in LPS-induced defense.
Main Methods:
- Utilized the model plant Arabidopsis thaliana.
- Tested the defense-inducing activity of LPS components (core oligosaccharide, lipid A) and synthetic O-antigen oligosaccharides.
- Investigated the involvement of Arabidopsis syntaxin PEN1 in LPS signaling.
Main Results:
- Core oligosaccharide and lipid A moieties of LPS, along with synthetic O-antigen oligosaccharides, induced defense responses in Arabidopsis thaliana.
- Evidence suggests a potential role for the Arabidopsis syntaxin PEN1 in LPS-induced plant defenses.
- Vesicle trafficking may be involved in the LPS signaling pathway.
Conclusions:
- Lipopolysaccharides (LPS) are effective elicitors of plant defense responses.
- The Arabidopsis syntaxin PEN1 is implicated in LPS perception and signaling.
- Plant immune responses to LPS may involve vesicle trafficking mechanisms.
Related Concept Videos
02:26Defenses Against Pathogens and Herbivores
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
01:19Formation of Lipopolysaccharides
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
02:43Plant Cell Wall
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.Collenchyma and sclerenchyma cells, on the other hand, mainly occur in the outer layers of a plant's stems and leaves. These cells provide the plant with strength and support by either partially thickening their primary cell wall (i.e., collenchyma), or depositing a...
01:07Plant Cell Wall
Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
01:14Cell Adhesion in Plants
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, and...
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, and...
01:15Cellulose and Pectic Polysaccharides
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 parenchyma cells of...
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...