摘要
赤霉素(GAs)是高等植物体内调控发育的重要激素。高等植物以3-磷酸甘油醛或丙酮酸为前体,首先在原质体内由环化酶催化形成贝壳杉烯;然后贝壳杉烯转移到内质网,在依赖细胞色素P450的单加氧酶的作用下转化成GA12醛;最后转入细胞质由依赖2-酮戊二酸的双加氧酶催化成各种GAs最终产物。目前几种模式植物中参与赤霉素合成的基因、cDNA已经克隆出来,相应功能也做了研究。本文在分子生物学水平上按照植物体内赤霉素合成路线,依次分析了参与各合成步骤上的基因、基因序列特性及其编码产物的催化功能,讨论了赤霉素生物合成的调控机理。
Gibberellins are important development-regulating hormone in higher plants. Higher plants first make use of glyceraldehydes 3-phosphate or pyruvate, the precursors in gibberellins biosynthesis, to synthesize ent-kaurene in the presence of cyclase as the catalyst in the proplastid,and then transfer it to the endoplasmic reticulum where they transform it into GA12-aldehyde in the presence of P450-dependent monooxygenases as the catalyst;finally they transfer GA12-aldehyde to the cytoplasm where they synthesize all the kinds of GAs in the presence of 2-oxoglutarate-dependent dioxygenase as the catalyst. By now, the genes and cDNA participating in gibberellins biosynthesis of Several modular plants have been cloned and their functions have been correspondingly studied. Following the pathway of gibberellins synthesis on molecular biological level, the paper reviews the genes and gene sequences participating in various stages of the synthesis and the catalytic functions of their encoded products, and discusses the regulating mechanism of gibberellins biosynthesis
出处
《西北植物学报》
CAS
CSCD
北大核心
2006年第7期1482-1489,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
山东省自然科学基金(Y96D22075)
作者简介
石琰璟（1974-），女（汉族），博士，讲师，2002年博士毕业于山东农业大学园艺学院。E-mail：syj99@163．com
通讯联系人。Correspondence to：SHU Huai-rui．E-mail：hrshu@sdau．edu．cn
