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Questions and Answers
Match the components of the octadecanoid pathway with their functions:
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:
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:
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:
Match the enzymes involved in the octadecanoid pathway with their substrates:
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Match the molecules involved in the octadecanoid pathway with their respective abbreviations:
Match the molecules involved in the octadecanoid pathway with their respective abbreviations:
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Match the products of the octadecanoid pathway with their effects on plant defense:
Match the products of the octadecanoid pathway with their effects on plant defense:
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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.
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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.
