植物学通报2004，Vol.21Issue(3)：352-359,8.
高等植物脱落酸生物合成途径及其酶调控
Pathways and Related Enzymes of ABA Biosynthesis in Higher Plants
摘要
Abstract
Two pathways have been proposed for the biosynthesis of ABA: the ‘direct pathway'farnesyl diphosphate; in indirect pathway, ABA is produced from the oxidative cleavage of carotenoids.The first committed step for ABA biosynthesis in plants is the oxidative cleavage of a 9-cisepoxycarotenoid(C40) to produce xanthoxin(C15) and a C25 by-product(Fig.2). Xanthoxin is then oxidized to a ketone by an NAD-requiring enzyme. Consequently, there is a nonenzymatic desaturation of the 2'-3' bond and opening of the epoxide ring to form abscisic aldehyde. In the final step of the pathway, abscisic aldehyde is oxidized to ABA. These endogenous enzymes such as zeaxanthin epoxidase(ZEP), 9-cis-epoxycarotenoid dioxygenase(NCED) and aldehyde oxidase(AO) may play key roles in the regulation of ABA biosynthesis in higher plants.关键词
脱落酸/生物合成/NCED基因/AO基因/酶调控Key words
Abscisic acid/Biosynthesis/NCED gene/AO gene/Enzymatic regulation分类
农业科技引用本文复制引用
万小荣,李玲..高等植物脱落酸生物合成途径及其酶调控[J].植物学通报,2004,21(3):352-359,8.基金项目
This work was supported by the grants of the key project on scientific and technological research from the Ministry of Education (03098) and the ‘Thousand-hundred-ten project' cultivating excellent personnel from the Department of Education of Guangdong p （03098）
