Topic
Gibberellic acid
About: Gibberellic acid is a research topic. Over the lifetime, 6597 publications have been published within this topic receiving 109294 citations. The topic is also known as: GIBBERELLIN A3.
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TL;DR: The developed genome editing tool was used to engineer the metabolic pathways responsible for the accumulation of a series GAs in the filamentous fungus F. fujikuroi, and successfully changed its GA product profile, from GA3 to tailor-made GA4 and GA7 mixtures.
Abstract: The filamentous fungus Fusarium fujikuroi is well-known for its production of natural plant growth hormones: a series of gibberellic acids (GAs). Some GAs, including GA1, GA3, GA4, and GA7, are bio...
60 citations
TL;DR: It is demonstrated that supplementation with GA3 may be an excellent strategy to optimize the production of secondary metabolites from E. purpurea hairy root cultures; however, the GA3 concentration is a critical factor.
Abstract: Gibberellic acid (GA3) is reported to have diverse effects on hairy root cultures of many plant species; therefore, the effects of GA3 on the growth, secondary metabolite production (caffeic acid derivatives and lignin), phenylalanine ammonia lyase (PAL) activity, and free radical scavenging activity of light-grown Echinacea purpurea L. hairy roots were investigated. Eight concentrations of GA3, ranging from 0.005 to 1.0 μM, were added to shake flask cultures. The moderate GA3 concentration, 0.025 μM, resulted in the highest concentrations of cichoric acid, caftaric acid, and chlorogenic acid, as well as increased PAL activity, cell viability, and free radical scavenging activity, while higher and lower GA3 concentrations resulted in reduced levels compared to the control (lacking GA3). The moderate GA3 concentration also affected root morphogenesis; supplementation with 0.025 μM GA3 resulted in the development of thick, dense, purple-colored roots, while roots exposed to the higher and lower concentrations of GA3 were thin and off-white. This study demonstrates that supplementation with GA3 may be an excellent strategy to optimize the production of secondary metabolites from E. purpurea hairy root cultures; however, the GA3 concentration is a critical factor.
60 citations
60 citations
TL;DR: Cdc2Os-3 belongs to a group of CDKs that have no counterparts in animals, and may function in a plant-specific gibberellin-regulated cell division process, suggesting a distinct role in regulating G2/M phase progression.
Abstract: Internodal growth of deepwater rice (Oryza sativa L.) can achieve rates of up to 10 mm h−1. In submergence-induced plants, gibberellic acid activates the cell division cycle first at the G1 → S phase transition with a subsequent increase in mitotic activity. The proteins cycA1;1 and cdc2Os-3 are the regulatory and catalytic subunits, respectively, of cyclin-dependent protein kinases (CDKs) which are central to cell cycle regulation. Both genes are regulated by gibberellic acid in a coordinate manner with transcripts accumulating in the G2 phase prior to the B2-type mitotic cyclins described previously (M. Sauter et al. 1995, Plant J 7: 623–632), suggesting a distinct role in regulating G2/M phase progression. Since cdc2Os-3 belongs to a group of CDKs that have no counterparts in animals, it may function in a plant-specific gibberellin-regulated cell division process.
60 citations
TL;DR: In this article, the biosyntheses of rosenonolactone in Trichothecium roseum and of gibberellic acid in Gibberella fujikuroi have been studied by feeding experiments with CH 3 14 CO 2 Na and (2- 14 C)-mevalonic lactone.
60 citations