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ReviewQuestionsLec23 - synthesized ABA can reach guard...

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Review Questions for Lecture 23 1. What are the major physiological functions of ABA? 2. What is the biosynthetic precursor of ABA? Where does the ABA biosynthesis take place in plants and inside a plant cell? 3. What is seed dormancy? Describe 5 basic mechanism of seed coat-imposed seed dormancy. List three environmental factors that control the release from seed dormancy. 4. What is vivipary? What is the source of ABA that inhibits vivipary? 5. Protonated ABA can easily enter mesophyll cell and be metabolized to become either temporally inactive or permanently inactive. Describe two different biochemical processes that are responsible for the inactivation of a free ABA. What kind of signal the roots need to send to leaves to ensure that a majority of the root-
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Unformatted text preview: synthesized ABA can reach guard cells to exert their physiological effects? 6. List two experimental findings that support an antagonistic interaction between ABA and GA. 7. Name the recently-claimed receptors for ABA and describe the previously known functions of some of these “ABA receptors”. 8. What are ABI1 and ABI2? How were they discovered? How many homologs are there in Arabidopsis? Explain the experiment that proved the “negative regulator” nature of ABI1 and its homologs. 9. Briefly describe the experimental approaches that led to the discovery of the “true ABA receptors”. 10. Explain the current model that explains how ABA is perceived by plant cells to regulate the expression of ABA-regulated genes....
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