共查询到17条相似文献,搜索用时 62 毫秒
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赤霉素是最重要的植物生长调节剂之一,在农业生产中得到越来越广泛的应用,具有广阔的市场前景,但其工业化的高生产成本严重制约着它的广泛应用。近年来,利用生物技术提升赤霉素产量日益成为研究热点。赤霉素生物合成是多种酶协同作用的过程,阐明赤霉素的生物合成机制,利用代谢工程策略调控代谢流量,对提高赤霉素产量至关重要。文中综述了当前藤仓赤霉菌赤霉素生物合成途径、关键酶、环境因素、代谢流调控等方面的研究进展,在代谢调控方面进行了展望,以期为实现赤霉素稳产高产提供思路。 相似文献
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高等植物赤霉素生物合成及其调节研究进展 总被引:15,自引:0,他引:15
主要介绍近年来高等植物中生物活性GAs的生物合成,拟南芥GA生物合成途径中关键酶基因(GA1-GA5)的克隆和GA3基因CYP701A3的母(Saccharomyces cerevisiae)中的成功表达。评述了活性GAs对赤霉不生物合成的反馈抑制作用和反馈调节中信号的传递和接收问题。高等植物中光周期对GA生物合成的调节主要是在20-氧化和/或3β-羟基化步骤。 相似文献
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花色素苷生物合成的遗传和发育调控 总被引:18,自引:2,他引:16
概述了高等植物花色素苷生物合成过程的遗传和发育调控的研究进展。重点介绍花色素苷生物合成的结构基因和调控基困的分子克隆,调控基因对结构基因的调控功能。 相似文献
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赤霉素生物合成及其分子机理研究进展 总被引:5,自引:0,他引:5
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。 相似文献
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高等植物细胞周期调控的研究 总被引:1,自引:0,他引:1
高等植物细胞周期调控的研究邵宏波,初立业,刘淑敏(四平师范学院生物工程研究所四平136000)细胞分裂对于单细胞和多细胞有机体都是最基本的发育过程。某种统一的分子生物学调节网在动物、植物和酵母中控制着这个过程。本文着重对高等植物细胞周期调控研究进展做... 相似文献
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Gibberellin production by Gibberella fujikuroi started only after the nitrogen source was depleted and ceased upon its renewal. Nitrogen repression of gibberellin biosynthesis is not an indirect effect of the growth arrest that follows the depletion of an essential nutrient because gibberellins were not produced upon depletion of phosphate. Mycelia produced gibberellins when suspended in a glucose solution. Production ceased some time after depletion of glucose and resumed upon its readdition. Under certain conditions, the gibberellin production rate was inversely proportional to the glucose concentrations. The specific regulation of gibberellin biosynthesis by the nitrogen source imposes a revision of the concept that gibberellins are secondary metabolites whose production is triggered by imbalance or cessation of growth. 相似文献
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Gibberellin Metabolism and Its Regulation 总被引:1,自引:0,他引:1
Hedden P 《Journal of Plant Growth Regulation》2001,20(4):317-318
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高等植物赤霉素的代谢与信号转导 总被引:1,自引:0,他引:1
赤霉素是一种重要的二萜类植物激素,有着广泛而复杂的生物学功能,调节植物整个生命周期不同阶段的生长和发育。本文在分子生物学水平上对高等植物中的赤霉素代谢以及信号转导的最新研究进展进行了总结。 相似文献
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Light Regulation of Gibberellin Biosynthesis and Mode of Action 总被引:7,自引:0,他引:7
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Yuxing Deng 《植物科学评论》2017,36(4):257-290
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Jocelyn A. Ozga Dennis M. Reinecke Belay T. Ayele Phuong Ngo Courtney Nadeau Aruna D. Wickramarathna 《Plant physiology》2009,150(1):448-462
In pea (Pisum sativum), normal fruit growth requires the presence of the seeds. The coordination of growth between the seed and ovary tissues involves phytohormones; however, the specific mechanisms remain speculative. This study further explores the roles of the gibberellin (GA) biosynthesis and catabolism genes during pollination and fruit development and in seed and auxin regulation of pericarp growth. Pollination and fertilization events not only increase pericarp PsGA3ox1 message levels (codes for GA 3-oxidase that converts GA20 to bioactive GA1) but also reduce pericarp PsGA2ox1 mRNA levels (codes for GA 2-oxidase that mainly catabolizes GA20 to GA29), suggesting a concerted regulation to increase levels of bioactive GA1 following these events. 4-Chloroindole-3-acetic acid (4-Cl-IAA) was found to mimic the seeds in the stimulation of PsGA3ox1 and the repression of PsGA2ox1 mRNA levels as well as the stimulation of PsGA2ox2 mRNA levels (codes for GA 2-oxidase that mainly catabolizes GA1 to GA8) in pericarp at 2 to 3 d after anthesis, while the other endogenous pea auxin, IAA, did not. This GA gene expression profile suggests that both seeds and 4-Cl-IAA can stimulate the production, as well as modulate the half-life, of bioactive GA1, leading to initial fruit set and subsequent growth and development of the ovary. Consistent with these gene expression profiles, deseeded pericarps converted [14C]GA12 to [14C]GA1 only if treated with 4-Cl-IAA. These data further support the hypothesis that 4-Cl-IAA produced in the seeds is transported to the pericarp, where it differentially regulates the expression of pericarp GA biosynthesis and catabolism genes to modulate the level of bioactive GA1 required for initial fruit set and growth. 相似文献