Practice question
Question
ABA plays an important role in plant response to water stress. In the table below, column X represents some of the important enzymes in ABA biosynthesis/degradation pathways, while column Y summarizes the major function of these enzymes. Column X (Enzymes) Column Y (Functions) A. 9-cis-epoxycarotenoid dioxygenase i. Involved in the oxidative pathway of ABA catabolism B. Cytochrome P450 monooxygenase (CYP707A3) ii. Production of a sugar-conjugated form of ABA C. ABA glucosyltransferase iii. Xanthoxin production D. β-glucosidase iv. Releases ABA from its sugar-conjugated form Choose the option showing the correct match between column X and column Y?
Explanation
9-cis-epoxycarotenoid dioxygenase (NCED) produces xanthoxin, CYP707A3 (P450) hydroxylates ABA for catabolism, ABA-glucosyltransferase conjugates ABA to glucose, β-glucosidase hydrolyzes conjugate to release active ABA. Correct match A-iii B-i C-ii D-iv. Documented in standard textbooks and confirmed by experimental validation.
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