图1. ABA生物合成和分解代谢途径（根据DEJONGHE等^[13]修改）
ABA前体是由甲基赤藓糖醇磷酸（MEP）途径合成的。酶用红色表示。ZEP：玉米黄质环氧化酶;NSY：新黄质合酶;NCED：9-顺式-环氧类胡萝卜素双加氧酶;XD：黄氧素脱氢酶;ABAO：脱落醛氧化酶;CYP707A：ABA 8'-羟化酶;ABH1：红花菜豆酸还原酶1;ABAGT：ABA葡糖基转移酶;βG：β-葡糖苷酶。酶的抑制剂用蓝色表示。(+)-9'-AABA：(+)-9'-乙炔-ABA;AHI4：ABA 8'-羟化酶抑制剂4;(+)-8'-MABA：(+)-8'-次甲基-ABA;NDGA：去甲二氢愈创木酸;SLCCD13：类倍半萜类胡萝卜素裂解双加氧酶抑制剂13

Fig. 1. ABA biosynthetic and catabolic pathways (Modified from DEJONGHE et al.^[13])
ABA precursor is synthesized from the methylerythritol phosphate (MEP) pathway. Enzymes are shown in red colour. ZEP: Zeaxanthin epoxidase; NSY: Neoxanthin synthase; NCED: 9-cis-epoxycarotenoid dioxygenase; XD: Xanthoxin dehydrogenase; ABAO: Abscisic aldehyde oxidase; CYP707A: ABA 8'-hydroxylase; ABH1: Phaseic acid reductase 1; ABAGT: ABA glucosyltransferase; βG: β-glucosidase. Enzyme inhibitors are shown in blue colour. (+)-9'-AABA: (+)-9'-acetylene-ABA; AHI4: ABA-8'-hydroxylase inhibitor 4; (+)-8'-MABA: (+)-8'-methylidyne-ABA; NDGA: Nordihydroguaiaretic acid; SLCCD13: Sesquiterpene-like carotenoid cleavage dioxygenase inhibitor 13