| 摘要: |
| 脱落酸(ABA)在植物的生长发育和环境胁迫响应等过程中具有重要作用。ABA合成与分解代谢的动态平衡共同调控植物内源ABA水平。ABA 8'位甲基羟基化途径是高等植物内源ABA代谢的主要途径; 8'-羟化酶是该代谢途径的关键酶,属于P450酶系。生物化学和基因组学研究表明,拟南芥CYP707A家族基因编码8'-羟化酶,该基因家族广泛存在于高等植物中,调控植物内源ABA代谢,介导ABA相关的生理生化过程。本文综述了ABA分解代谢的基本途径,详细概述了ABA 8'位甲基羟基化途径及该代谢途径的关键酶8'-羟化酶。同时介绍了8'-羟化酶编码基因-CYP707A家族基因的生物学特征和功能。 |
| 关键词: ABA分解代谢 8'-羟化酶 CYP707A基因家族 |
| DOI： |
| 分类号:Q943 |
| Fund project: |
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| Abscisic acid catabolism and 8'-hydroxylase, a key enzyme in the oxidative catabolism |
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LI Xi-Qian, WANG Xiao-Feng*
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College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China
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| Abstract: |
| Abscisic acid(ABA)plays great roles in normal growth and development as well as in adaptive responses to environmental stresses in higher plants. For correcting and accurate actions,physiologically active ABA level is controlled through fine-tuning of de novo biosynthesis and catabolism. Hydroxylation at the C-8'position of ABA is the predominant ABA catabolic pathway in higher plants,which is catalyzed by ABA 8'-hydroxylase,a member of cytochrome P450(P450)series. Recently,the CYP707A family of Arabidopsis has been identified as ABA 8'-hydroxylase by genomic and biochemical approaches. The CYP707A family is present in a wide range of plant and functions in ABA catabolism in plants. This paper summarizes ABA catabolic pathways in higher plants and briefly concentrates on 8'-hydroxylation pathway. The key enzyme in the pathway and the genes coding for it are also described. |
| Key words: ABA catabolism 8'-hydroxylase CYP707A family |
