polyamine/arabidopsis

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COPPER AMINE OXIDASE1 (CuAO1) of Arabidopsis thaliana contributes to abscisic acid- and polyamine-induced nitric oxide biosynthesis and abscisic acid signal transduction.

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Polyamines (PA), polyamine oxidases, copper amine oxidases, and nitric oxide (NO) play important roles in physiology and stress responses in plants. NO biosynthesis as a result of catabolism of PA by polyamine oxidases and copper amine oxidases may explain in part PA-mediated responses. Involvement

Longer uncommon polyamines have a stronger defense gene-induction activity and a higher suppressing activity of Cucumber mosaic virus multiplication compared to that of spermine in Arabidopsis thaliana.

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CONCLUSIONS Our work suggests that long chain polyamines and their derivatives are potential chemicals to control viral pathogens for crop production. Previously we showed that two tetraamines, spermine (Spm) and thermospermine (T-Spm), induce the expression of a subset of defense-related genes and

Effect of Thermospermine on the Growth and Expression of Polyamine-Related Genes in Rice Seedlings.

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A mutant defective in the biosynthesis of thermospermine, acaulis5 (acl5), shows a dwarf phenotype with excess xylem vessels in Arabidopsis thaliana. Exogenous supply of thermospermine remarkably represses xylem differentiation in the root of seedlings, indicating the role of

Highly-expressed polyamine oxidases catalyze polyamine back conversion in Brachypodium distachyon.

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To understand the polyamine (PA) catabolic pathways in Brachypodium distachyon, we focused on the flavin-containing polyamine oxidase enzymes (PAO), and characterized them at the molecular and biochemical levels. Five PAO isoforms were identified from database searches, and we named them BdPAO1 to

Phenylpropanoid polyamine conjugate biosynthesis in Arabidopsis thaliana flower buds.

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Phenylpropanoid polyamine conjugates have been identified in flowers of many plant species. Their presence in Arabidopsis thaliana has only been recently established in flower buds and pollen grains. Annotation and location of a cation-dependent O-methyltransferase AtTSM1 specifically to the tapetum

A Polyamine Oxidase from Selaginella lepidophylla (SelPAO5) can Replace AtPAO5 in Arabidopsis through Converting Thermospermine to Norspermidine instead to Spermidine.

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Of the five polyamine oxidases in Arabidopsis thaliana, AtPAO5 has a substrate preference for the tetraamine thermospermine (T-Spm) which is converted to triamine spermidine (Spd) in a back-conversion reaction in vitro. A homologue of AtPAO5 from the lycophyte Selaginella lepidophylla

Role of polyamines in plant vascular development.

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Several pieces of evidence suggest a role for polyamines in the regulation of plant vascular development. For instance, polyamine oxidase gene expression has been shown to be associated with lignification, and downregulation of S-adenosylmethionine decarboxylase causes dwarfism and enlargement of

Integrated metabolite and gene expression profiling revealing phytochrome A regulation of polyamine biosynthesis of Arabidopsis thaliana.

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In this study, metabolite profiling was demonstrated as a useful tool to plot a specific metabolic pathway, which is regulated by phytochrome A (phyA). Etiolated Arabidopsis wild-type (WT) and phyA mutant seedlings were irradiated with either far-red light (FR) or white light (W). Primary

Ornithine: the overlooked molecule in the regulation of polyamine metabolism.

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We overexpressed a mouse ornithine decarboxylase gene under the control of a constitutive and an estradiol-inducible promoter in Arabidopsis thaliana to increase our understanding of the regulation of polyamine metabolism. Of particular interest was the role of the substrate ornithine not only in

Polyamines alleviate the inhibitory effect of the DNA cross-linking agent mitomycin C on root growth.

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Polyamines (putrescine, spermidine and spermine) are ubiquitously present in various types of cells of living organisms. They are involved in a variety of cellular processes, including cell proliferation and cell differentiation, and are required for abiotic stress tolerances in plants. However, it

Chlorella viruses contain genes encoding a complete polyamine biosynthetic pathway.

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Two genes encoding the putative polyamine biosynthetic enzymes agmatine iminohydrolase (AIH) and N-carbamoylputrescine amidohydrolase (CPA) were cloned from the chloroviruses PBCV-1, NY-2A and MT325. They were expressed in Escherichia coli to form C-terminal (His)6-tagged proteins and the

Phenotypic and Genotypic Characterization of Mutant Plants in Polyamine Metabolism Genes During Pathogenic Interactions.

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Plants respond to pathogen attack by modifying defense gene expression and inducing the production of myriad proteins and metabolites. Among these responses, polyamine (PA) levels suffer remarkable modifications. Evidences demonstrate that plants make use of the polyamine biosynthetic pathway and

Polyamines interfere with protein ubiquitylation and cause depletion of intracellular amino acids: a possible mechanism for cell growth inhibition.

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Spermidine is a polyamine present in eukaryotes with essential functions in protein synthesis. At high concentrations spermidine and norspermidine inhibit growth by unknown mechanisms. Transcriptomic analysis of the effect of norspermidine on the plant Arabidopsis thaliana indicates upregulation of

CGI-58, a key regulator of lipid homeostasis and signaling in plants, also regulates polyamine metabolism.

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Comparative Gene Identification-58 (CGI-58) is an α/β hydrolase-type protein that regulates lipid homeostasis and signaling in eukaryotes by interacting with and stimulating the activity of several different types of proteins, including a lipase in mammalian cells and a peroxisomal ABC transporter

Genome-Wide Association Mapping Analyses Applied to Polyamines.

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Genome Wide Association Studies (GWAS) allow the use of natural variation to understand the genetics controlling specific traits. Efficient methods to conduct GWAS in plants have been reported. This chapter provides the main steps to conduct and analyse GWAS in Arabidopsis thaliana using polyamine

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