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Identification of a glycosylphosphatidylinositol-anchored plasma membrane protein interacting with the C-terminus of auxin-binding protein 1: a photoaffinity crosslinking study.

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Synthetic peptides corresponding to the C-terminus of auxin-binding protein 1 (ABP1) have been shown to function as auxin agonists. To define a C-terminal receptor, photoaffinity crosslinking experiments were performed using an azido derivative of a C-terminal peptide and plasma membranes from maize

The Phytophthora parasitica RXLR effector penetration-specific effector 1 favours Arabidopsis thaliana infection by interfering with auxin physiology.

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Pathogenic oomycetes have evolved RXLR effectors to thwart plant defense mechanisms and invade host tissues. We analysed the function of one of these effectors (Penetration-Specific Effector 1 (PSE1)) whose transcript is transiently accumulated during penetration of host roots by the oomycete

Characterization of auxin-binding protein 1 from tobacco: content, localization and auxin-binding activity.

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There is evidence that auxin-binding protein 1 (ABP1) is an auxin receptor on the plasma membrane. Maize (Zea mays L.) possesses a high level of auxin-binding activity due to ABP1, but no other plant source has been shown to possess such an activity. We have analyzed the ABP1 content of tobacco

Overexpression of auxin-binding protein enhances the sensitivity of guard cells to auxin.

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To explore the role of auxin-binding protein (ABP1) in planta, a number of transgenic tobacco (Nicotiana tabacum) lines were generated. The wild-type KDEL endoplasmic reticulum targeting signal was mutated to HDEL, another common retention sequence in plants, and to KEQL or KDELGL to compromise its

The AMI1 gene family: indole-3-acetamide hydrolase functions in auxin biosynthesis in plants.

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Novel genes that function in the conversion of indole-3-acetamide (IAM) into indole-3-acetic acid (IAA), which were previously thought to exist only in the bacterial genome, have been isolated from plants. The finding of the AtAMI1 gene in Arabidopsis thaliana and the NtAMI1 gene in Nicotiana

Differential Gene Expression in Response to Auxin Treatment in the Wild Type and rac, an Adventitious Rooting-Incompetent Mutant of Tobacco.

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Histological analyses of auxin-treated cuttings from the wild type and the rac mutant of tobacco (Nicotiana tabacum cv Xanthii) previously revealed that some rac phloem parenchyma or inner cortical parenchyma cells form callus in response to exogenous auxin treatment but these cells never undergo

Auxin-Gibberellin Interactions and Their Role in Plant Growth.

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Recently it was discovered that auxin promotes gibberellin (GA) biosynthesis in decapitated stems of pea (Pisum sativum L.) and tobacco (Nicotiana tabacum L.), and here we review the evidence for this interaction. We also discuss the possible relationship between auxin and the mechanisms by which

Expression of Agrobacterium rhizogenes auxin biosynthesis genes in transgenic tobacco plants.

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Plant oncogenes aux1 and aux2 carried by the TR-DNA of Agrobacterium rhizogenes strain A4 encode two enzymes involved in the auxin biosynthesis pathway in transformed plant cells. The short divergent promoter region between the two aux-coding sequences contains the main regulatory elements. This

Molecular cloning and expression of the early auxin-responsive Aux/IAA gene family in Nicotiana tabacum.

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Early auxin-regulated tobacco cDNAs, belonging to the Aux/IAA gene family have been isolated by screening of a cDNA library prepared from auxin-treated suspension-grown etiolated seedlings of Nicotiana tabacum. The probes used were either RT-PCR fragments or an insert resulting from mRNA

Mutants of Nicotiana plumbaginifolia with specific resistance to auxin.

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We have isolated nine independent auxin-resistant mutants of Nicotiana plumbaginifolia by culturing M2 seedlings in the presence of indole-3-acetic acid ethyl ester or 1-naphthaleneacetic acid at concentrations which significantly inhibit hypocotyl elongation of the wild type. The mutations were

Oligogalacturonides inhibit the induction of late but not of early auxin-responsive genes in tobacco.

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Oligogalacturonides (OGs) released from the plant cell wall regulate several defense responses, as well as various aspects of plant growth and development. In these latter effects, OGs exhibit auxin-antagonist activity. To shed light on the mechanism by which OGs antagonise auxin, we analysed the

Isolation by differential display and characterization of a tobacco auxin-responsive cDNA Nt-gh3, related to GH3.

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By use of differential display, we have isolated a new early auxin-responsive cDNA in Nicotiana tabacum. Nt-gh3 had 70% identity with the unique GH3 sequence isolated in soybean by Hagen et al. [Planta 162 (1984) 147-153] and is thus the first reported cDNA related to this gene until now. Nt-gh3

An improvement of auxin extraction procedure and its application to cultured plant cells.

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The senescent cultured tobacco (Nicotiana tabacum L.) cells, XD6S, when extracted with customary procedure, contained much auxin. The use of new extraction procedure using dichloromethane which does not extract much indolepyruvic acid revealed that the cultured tobacco cells do not contain

Knocking down expression of the auxin-amidohydrolase IAR3 alters defense responses in Solanaceae family plants.

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In plants, indole-3-acetic acid (IAA) amido hydrolases (AHs) participate in auxin homeostasis by releasing free IAA from IAA-amino acid conjugates. We investigated the role of IAR3, a member of the IAA amido hydrolase family, in the response of Solanaceous plants challenged by biotrophic and

Biological activities of indoleacetylamino acids and their use as auxins in tissue culture.

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THE AUXIN ACTIVITIES OF A NUMBER OF INDOLEACETYLAMINO ACID CONJUGATES HAVE BEEN DETERMINED IN THREE TEST SYSTEMS: growth of tomato hypocotyl explants (Lycopersicon esculentum Mill. cv. Marglobe); growth of tobacco callus cultures (Nicotiana tabacum L. cv. Wisconsin 38); and ethylene production from

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