Abscisic Acid Biosynthesis and Metabolism - …

ABSCISIC ACID BIOSYNTHESIS AND CATABOLISM | …

Concise enantioselective synthesis of abscisic acid and …

Biosynthesis and Metabolism
ABA is a naturally occurring compound in plants. It is a sesquiterpenoid (15-carbon) which is partially produced via the mevalonic pathway in chloroplasts and other plastids. Because it is sythesized partially in the chloroplasts, it makes sense that biosynthesis primarily occurs in the leaves. The production of ABA is accentuated by stresses such as water loss and freezing temperatures. It is believed that biosynthesis occurs indirectly through the production of carotenoids. Carotenoids are pigments produced by the chloroplast which have 40 carbons. Breakdown of these carotenoids occurs by the following mechanism: Violaxanthin is a carotenoid which has forty carbons. It is isomerized and then split via an isomerase reaction followed by an oxidation reaction. One molecule of xanthonin is produced from one molecule of violaxanthonin and it is uncertain what happens to the remaining biproduct. The one molecule of xanthonin produced is unstable and spontaneously changed to ABA aldehyde. Further oxidation results in ABA. Activation of the molecule can occur by two methods. In the first method, an ABA-glucose ester can form by attachment of glucose to ABA. In the second method, oxidation of ABA can occur to form phaseic acid and dihyhdrophaseic acid. The transport of ABA can occur in both xylem and phloem tissues. It can also be translocated through paranchyma cells. The movement of abscisic acid in plants does not exhibit polarity like auxins. ABA is capable of moving both up and down the stem (Walton and Li, 1995; Salisbury and Ross).

Citation: Ruth Finkelstein. (2013) Abscisic Acid Synthesis and Response. The Arabidopsis Book 11:e0166. doi:10.1199/tab.0166

Abscisic Acid Synthesis and Response - Europe PMC …

Walton, D. C., and Li, Y. (1995). "Abscisic acid biosynthesis and metabolism". Plant Hormones: Physiology, Biochemistry and Molecular Biology. Dordrecht: Kluwer. pp. 140-157.

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, , , and . (2006)Concise enantioselective synthesis of abscisic acid and a new analogue. Organic & biomolecular chemistry, 4 (22). pp. 4186-4192. ISSN 1477-0520