Related Experiment Video
Updated: Jul 11, 2026
04:11
Pattern-Triggered Oxidative Burst and Seedling Growth Inhibition Assays in Arabidopsis thaliana
Published on: May 21, 2019
Herbivore-plant interactions: mixed-function oxidases and secondary plant substances
Science (New York, N.Y.)
|June 17, 1977
Summary
Insect larvae rapidly boost mixed-function oxidases when exposed to plant compounds. This defense mechanism protects herbivores from toxic plant substances, enhancing survival against chemical stress.
Area of Science:
- Insect toxicology
- Plant-insect interactions
- Biochemistry
Background:
- Herbivores encounter diverse secondary plant substances during feeding.
- These plant compounds can pose significant toxicological challenges to insects.
- Mixed-function oxidases (MFOs) are critical enzymes in detoxification pathways.
Purpose of the Study:
- To investigate the induction of MFOs in the southern armyworm (Spodoptera eridania) by secondary plant substances.
- To determine the speed and sensitivity of this MFO induction.
- To assess the role of MFOs in herbivore defense against plant toxins.
Main Methods:
- Feeding southern armyworm larvae with diets containing various secondary plant substances.
- Measuring the activity levels of MFOs in response to dietary exposure.
- Assessing the susceptibility of larvae to dietary poisoning after MFO induction.
Main Results:
- A wide range of secondary plant substances rapidly induced MFO activity in Spodoptera eridania.
- Induction occurred even with small quantities of secondary plant substances.
- Induced larvae exhibited reduced susceptibility to dietary poisoning.
Conclusions:
- Mixed-function oxidases are rapidly induced in herbivores by secondary plant substances.
- MFO induction is a key defense mechanism for herbivores facing chemical stress from plants.
- This enzymatic response plays a major role in the survival of polyphagous herbivores.
Related Concept Videos
01:09Microbe-Plant Interactions
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
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.
01:24Peroxisomes
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
01:30Peroxisomes
Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...
01:40Overview of Metabolism
Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
02:40Epiphytes, Parasites, and Carnivores
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...