Questions and Answers
Match the components of the octadecanoid pathway with their functions:
Lipoxygenase (LOX) = Converts linolenic acid to 13-hydroperoxyoctadecatrienoic acid Allene oxide synthase (AOS) = Converts 13-hydroperoxyoctadecatrienoic acid to 12,13-epoxyoctadecatrienoic acid Linolenic acid = Released from plant membranes in response to stress or injury Octadecanoids = A class of signaling molecules derived from fatty acids
Match the steps of the octadecanoid pathway with their corresponding products:
Step 1 = Linolenic acid Step 2 = 13-hydroperoxyoctadecatrienoic acid Step 3 = 12,13-epoxyoctadecatrienoic acid Step 4 = Jasmonic acid
Match the biological functions of the octadecanoid pathway with their descriptions:
Plant defense = Against insects and pathogens Wound response = Regulating the plant's response to mechanical damage Hormone regulation = Interacting with other plant hormones Growth regulation = Not a direct function of the octadecanoid pathway
Match the enzymes involved in the octadecanoid pathway with their substrates:
Signup and view all the answers
Match the molecules involved in the octadecanoid pathway with their respective abbreviations:
Signup and view all the answers
Match the products of the octadecanoid pathway with their effects on plant defense:
Signup and view all the answers
Study Notes
Overview
The octadecanoid pathway is a signaling pathway involved in plant defense responses against insects and pathogens.
Key Components
- Octadecanoids: a class of signaling molecules derived from fatty acids, specifically linolenic acid (18:3)
- Lipoxygenase (LOX): an enzyme that catalyzes the conversion of linolenic acid to 13-hydroperoxyoctadecatrienoic acid (13-HPOT)
- Allene oxide synthase (AOS): an enzyme that converts 13-HPOT to 12,13-epoxyoctadecatrienoic acid (12,13-EOT)
Pathway Steps
- Linolenic acid is released from plant membranes in response to stress or injury
- Lipoxygenase (LOX) catalyzes the conversion of linolenic acid to 13-hydroperoxyoctadecatrienoic acid (13-HPOT)
- Allene oxide synthase (AOS) converts 13-HPOT to 12,13-epoxyoctadecatrienoic acid (12,13-EOT)
- 12,13-EOT is then converted to jasmonic acid (JA) through a series of enzyme-catalyzed reactions
- Jasmonic acid (JA) is the primary signaling molecule that activates plant defense responses
Biological Function
The octadecanoid pathway plays a crucial role in:
- Plant defense: against insects and pathogens, through the production of defense-related genes and chemicals
- Wound response: regulating the plant's response to mechanical damage
- Hormone regulation: interacting with other plant hormones, such as ethylene and salicylic acid, to modulate plant defense responses
Overview
- The octadecanoid pathway is a signaling pathway involved in plant defense responses against insects and pathogens.
Key Components
- Octadecanoids are a class of signaling molecules derived from fatty acids, specifically linolenic acid (18:3).
- Lipoxygenase (LOX) is an enzyme that catalyzes the conversion of linolenic acid to 13-hydroperoxyoctadecatrienoic acid (13-HPOT).
- Allene oxide synthase (AOS) is an enzyme that converts 13-HPOT to 12,13-epoxyoctadecatrienoic acid (12,13-EOT).
Pathway Steps
- Linolenic acid is released from plant membranes in response to stress or injury.
- Lipoxygenase (LOX) converts linolenic acid to 13-hydroperoxyoctadecatrienoic acid (13-HPOT).
- Allene oxide synthase (AOS) converts 13-HPOT to 12,13-epoxyoctadecatrienoic acid (12,13-EOT).
- 12,13-EOT is then converted to jasmonic acid (JA) through a series of enzyme-catalyzed reactions.
- Jasmonic acid (JA) is the primary signaling molecule that activates plant defense responses.
Biological Function
- The octadecanoid pathway plays a crucial role in plant defense against insects and pathogens by producing defense-related genes and chemicals.
- It regulates the plant's response to mechanical damage and wound response.
- The pathway interacts with other plant hormones, such as ethylene and salicylic acid, to modulate plant defense responses.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the octadecanoid pathway, a signaling process in plants that responds to insects and pathogens. Learn about key components like octadecanoids, lipoxygenase, and allene oxide synthase.
