Practice question
Question
Following statements are made regarding abscisic acid (ABA) signalling during water stress in plants. A. ABA causes membrane depolarization by decreasing cytosolic calcium levels.B. ABA causes alkalinisation of the cytosol which stimulates opening of K⁺efflux channels.C. ABA inhibits the activity of the plasma membrane H⁺-ATPase which results in membrane depolarization.D. During stomatal closure, ABA induces reorganization of tubulin cytoskeleton mediated by Rho GTPases.E. ABA induced membrane depolarization occur by release of calcium from endoplasmic reticulum and vacuoles. Which one of the following options is a combination of all correct statements?
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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