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Questions and Answers
What is the omega-3 fatty acid that jasmonic acid is derived from?
What is the omega-3 fatty acid that jasmonic acid is derived from?
Which enzyme converts jasmonic acid to its bioactive form, jasmonoyl-L-isoleucine?
Which enzyme converts jasmonic acid to its bioactive form, jasmonoyl-L-isoleucine?
What is the function of the SCF complex in the jasmonic acid signaling pathway?
What is the function of the SCF complex in the jasmonic acid signaling pathway?
Which of the following is NOT a function of the jasmonic acid pathway?
Which of the following is NOT a function of the jasmonic acid pathway?
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Which hormone does jasmonic acid antagonize?
Which hormone does jasmonic acid antagonize?
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What is the outcome of the interaction between jasmonic acid and salicylic acid?
What is the outcome of the interaction between jasmonic acid and salicylic acid?
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Which enzyme is NOT involved in the biosynthesis of jasmonic acid?
Which enzyme is NOT involved in the biosynthesis of jasmonic acid?
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What is the role of reactive oxygen species in the jasmonic acid pathway?
What is the role of reactive oxygen species in the jasmonic acid pathway?
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What is the outcome of the interaction between jasmonic acid and auxins?
What is the outcome of the interaction between jasmonic acid and auxins?
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What is the function of JAZ repressors in the jasmonic acid pathway?
What is the function of JAZ repressors in the jasmonic acid pathway?
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Study Notes
Jasmonic Acid Pathway
Overview
- A plant hormone signaling pathway involved in defense responses against biotic and abiotic stresses
- Plays a crucial role in plant immunity, growth, and development
Biosynthesis
- Jasmonic acid (JA) is derived from alpha-linolenic acid, an omega-3 fatty acid
- Conversion involves the octadecanoid pathway, which includes the following enzymes:
- Lipoxygenase (LOX)
- Allene oxide synthase (AOS)
- Allene oxide cyclase (AOC)
- OPDA reductase (OPR3)
Signaling Pathway
- JA is converted to its bioactive form, jasmonoyl-L-isoleucine (JA-Ile), by the enzyme JAR1
- JA-Ile binds to the COI1 receptor, a component of the SCF (Skp, Cullin, F-box) complex
- The SCF complex ubiquitinates and degrades JAZ (jasmonate ZIM-domain) repressors, allowing for the expression of JA-responsive genes
Functions
- Defense against herbivores and pathogens:
- Regulates the production of defense compounds, such as alkaloids and terpenes
- Activates the production of reactive oxygen species (ROS) to combat pathogens
- Wound response:
- Triggers the expression of wound-responsive genes, leading to the formation of callus tissue
- Growth and development:
- Regulates root growth, senescence, and flower development
- Modulates the expression of genes involved in auxin and ethylene signaling
Interactions with Other Hormones
- Interacts with salicylic acid (SA) to regulate defense responses against pathogens
- Antagonizes the effects of ethylene, promoting plant growth and development
- Interacts with auxins to regulate root growth and development
Jasmonic Acid Pathway
Overview
- Crucial plant hormone signaling pathway for defense against biotic and abiotic stresses
- Involved in plant immunity, growth, and development
Biosynthesis
- Derived from alpha-linolenic acid, an omega-3 fatty acid
- Involves the octadecanoid pathway with enzymes:
- Lipoxygenase (LOX)
- Allene oxide synthase (AOS)
- Allene oxide cyclase (AOC)
- OPDA reductase (OPR3)
Signaling Pathway
- Jasmonic acid (JA) converted to jasmonoyl-L-isoleucine (JA-Ile) by JAR1
- JA-Ile binds to COI1 receptor, part of SCF complex
- SCF complex ubiquitinates and degrades JAZ repressors, allowing JA-responsive gene expression
Functions
- Defense against herbivores and pathogens:
- Regulates defense compound production (alkaloids, terpenes)
- Activates reactive oxygen species (ROS) against pathogens
- Wound response:
- Triggers wound-responsive gene expression
- Leads to callus tissue formation
- Growth and development:
- Regulates root growth, senescence, and flower development
- Modulates auxin and ethylene signaling gene expression
Interactions with Other Hormones
- Interacts with salicylic acid (SA) for defense against pathogens
- Antagonizes ethylene, promoting plant growth and development
- Interacts with auxins for root growth and development regulation
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Description
A plant hormone signaling pathway involved in defense responses against biotic and abiotic stresses, playing a crucial role in plant immunity, growth, and development.
