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Questions and Answers
What type of terpenoid is ABA?
What are the physiological roles of ABA?
What are the effects of ABA on non-growing organs?
What serves as the starting point for various terpenoids including ABA?
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What was initially believed to directly yield ABA through oxidation and cyclization?
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Study Notes
ABA: A Type of Terpenoid
- ABA (Abscisic acid) is a type of sesquiterpene, a class of terpenoids.
Physiological Roles of ABA
- ABA plays a crucial role in regulating seed dormancy and germination.
- ABA is involved in the regulation of stomatal closure, helping to conserve water during drought conditions.
- ABA also helps to regulate plant responses to stress, such as high salinity, cold, and heat.
Effects of ABA on Non-Growing Organs
- ABA promotes the synthesis of proteins that help to protect plants from damage caused by stress.
- ABA helps to regulate the breakdown of stored nutrients in seeds, allowing for the mobilization of resources during germination.
Biosynthesis of ABA
- The isoprenoid pathway serves as the starting point for the synthesis of various terpenoids, including ABA.
- Initially, it was believed that xanthoxin directly yielded ABA through oxidation and cyclization.
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Description
Test your knowledge of the structure and physiological roles of the plant hormone ABA. Learn about its sesquiterpenoid nature, ring structure, side chain, inhibition of growth and metabolism, distribution in growing regions, and effects on seed germination and stress tolerance.
