Question:
Occurrence of "Indole Acetoldoxime Pathway" of auxin biosynthesis is characteristic to the members of this family:
Occurrence of "Indole Acetoldoxime Pathway" of auxin biosynthesis is characteristic to the members of this family:
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The model plant Arabidopsis thaliana belongs to the family Brassicaceae.
This pathway was discovered and characterized in Arabidopsis, making it a key feature of this family.
This pathway was discovered and characterized in Arabidopsis, making it a key feature of this family.
Updated On: Jul 31, 2026
- Compositae
- Chinopodiaceae
- Brassicaceae
- Malvaceae
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Auxin (indole-3-acetic acid, or IAA) is synthesized in plants through several tryptophan-dependent and tryptophan-independent pathways.
Step 2: Detailed Explanation:
The indole-3-acetaldoxime (IAOx) pathway is a tryptophan-dependent pathway of auxin biosynthesis.
In this pathway, tryptophan is converted to IAOx by cytochrome P450 enzymes (specifically CYP79B2 and CYP79B3).
IAOx is then converted to indole-3-acetonitrile (IAN) and subsequently hydrolyzed to IAA.
The IAOx pathway is highly restricted in the plant kingdom and is primarily found in members of the Brassicaceae family (such as Arabidopsis thaliana).
This restriction occurs because IAOx also serves as a key intermediate for the synthesis of glucosinolates and the phytoalexin camalexin, which are characteristic defense compounds of the Brassicaceae family.
Step 3: Final Answer:
The Indole Acetaldoxime Pathway of auxin biosynthesis is characteristic of the Brassicaceae family.
Auxin (indole-3-acetic acid, or IAA) is synthesized in plants through several tryptophan-dependent and tryptophan-independent pathways.
Step 2: Detailed Explanation:
The indole-3-acetaldoxime (IAOx) pathway is a tryptophan-dependent pathway of auxin biosynthesis.
In this pathway, tryptophan is converted to IAOx by cytochrome P450 enzymes (specifically CYP79B2 and CYP79B3).
IAOx is then converted to indole-3-acetonitrile (IAN) and subsequently hydrolyzed to IAA.
The IAOx pathway is highly restricted in the plant kingdom and is primarily found in members of the Brassicaceae family (such as Arabidopsis thaliana).
This restriction occurs because IAOx also serves as a key intermediate for the synthesis of glucosinolates and the phytoalexin camalexin, which are characteristic defense compounds of the Brassicaceae family.
Step 3: Final Answer:
The Indole Acetaldoxime Pathway of auxin biosynthesis is characteristic of the Brassicaceae family.
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