T1 - Auxin biosynthesis and storage forms

Other uses of synthetic auxins are that they are used to produce roots on cuttings, prevent preharvest dropping of fruits and prevent lateral buds from growing.

The pathway of auxin biosynthesis in plants - OUP …

The pathway of auxin biosynthesis in plants ..

AUXIN BIOSYNTHESIS | Annual Review of Plant Biology

Plant biologists have debated whether auxin biosynthesis proceeded via a pathway that is dependent on the amino acid tryptophan. Studies of this FMO-like enzyme in revealed that the enzyme most likely catalyzes the oxygenation of the compound tryptamine, a key finding, said Chory.

Auxin Signaling: From Synthesis to Systems Biology

To test whether the pathway controlled by the gene was also likely to be used for auxin synthesis in other plants, the researchers overexpressed the gene in tobacco plants. These experiments dramatically altered the tobacco plant, creating tobacco plants that resembled the -induced changes in .

KW - auxin biosynthesis

Melatonin Regulates Root Meristem by Repressing Auxin Synthesis …

However, she added, the picture of auxin biosynthesis is complicated by the fact that other scientists have produced mutant plants that cannot produce tryptophan, yet they can still produce auxin. "Thus, there is an alternative route, but at least now we can begin to propose a pathway for the tryptophan-dependent part of auxin biosynthesis."

Auxin Signaling From Synthesis To Systems Biology

AB - The plant hormone auxin drives plant growth and morphogenesis. The levels and distribution of the active auxin indole-3-acetic acid (IAA) are tightly controlled through synthesis, inactivation, and transport. Many auxin precursors and modified auxin forms, used to regulate auxin homeostasis, have been identified; however, very little is known about the integration of multiple auxin biosynthesis and inactivation pathways. This review discusses the many ways auxin levels are regulated through biosynthesis, storage forms, and inactivation, and the potential roles modified auxins play in regulating the bioactive pool of auxin to affect plant growth and development.

Microbial synthesis of the phytohormone auxin has been known for a long time

New Insights into Auxin Biosynthesis

Results presented here extend substantially our previous work in showing that ectopic expression of the mitotic inducer, Spcdc25, results in profound changes to root morphology, meristem architecture and the regulation of the plane of cell division. We further show that in planta Spcdc25 expression (1) depletes endogenous levels of the cytokinin, iPA, (2) down regulates the cytokinin receptor, AHK3, (3) results in over production of auxin and ethylene, (4) up-regulates ethylene biosynthetic genes and (5) induces hypersensitive hypocotyl growth responses to ethylene. Hence perturbation of genes associated with cytokinin and ethylene signalling explain the phenotypes upon expression of this fission yeast mitotic inducer gene. This indicates an important cross-talk between cell cycle regulation at G2/M transition, plant growth regulators and plant morphogenesis.

Are there auxin biosynthesis inhibitors? - ResearchGate

Are there auxin biosynthesis inhibitors

Expressing Spcdc25 in Arabidopsis results in increased formation of lateral and adventitious roots, a reduction of primary root width and more isodiametric cells in the root apical meristem (RAM) compared with wild type. Furthermore it stimulates root morphogenesis from hypocotyls when cultured on two way grids of increasing auxin and cytokinin concentrations. Microarray analysis of seedling roots expressing Spcdc25 reveals that expression of 167 genes is changed by > 2-fold. As well as genes related to stress responses and defence, these include 19 genes related to transcriptional regulation and signaling. Amongst these was the up-regulation of genes associated with ethylene synthesis and signaling. Seedlings expressing Spcdc25 produced 2-fold more ethylene than WT and exhibited a significant reduction in hypocotyl length both in darkness or when exposed to 10 ppm ethylene. Furthermore in Spcdc25 expressing plants, the cytokinin receptor AHK3 was down-regulated, and endogenous levels of iPA were reduced whereas endogeous IAA concentrations in the roots increased.

Root System Patterning: Auxin Synthesis at the Root …

A New Gene for Auxin Synthesis: Cell

N2 - The plant hormone auxin drives plant growth and morphogenesis. The levels and distribution of the active auxin indole-3-acetic acid (IAA) are tightly controlled through synthesis, inactivation, and transport. Many auxin precursors and modified auxin forms, used to regulate auxin homeostasis, have been identified; however, very little is known about the integration of multiple auxin biosynthesis and inactivation pathways. This review discusses the many ways auxin levels are regulated through biosynthesis, storage forms, and inactivation, and the potential roles modified auxins play in regulating the bioactive pool of auxin to affect plant growth and development.