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auxin
auxin
auxin Any of a group of plant
growth substances responsible for such processes as the promotion of growth by cell enlargement, the maintenance of
apical dominance, and the initiation of root formation in cuttings. Auxins are also involved in suppressing the
abscission of leaves, fruit, or other plant organs and in the development of flowers and fruits. Naturally occurring auxins, principally
indoleacetic acid (
IAA), are synthesized in actively growing regions of the plant, from where they are transported to other parts of the plant. IAA is stored in the plant in an inactive form, conjugated (attached) to various compounds, such as
myo-inositol. Synthetic auxins include
2,4-D, which is used as a weedkiller, and
indolebutyric acid and
naphthaleneacetic acid, which are sold in preparations of ‘rooting hormones’.
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Auxin signaling in Arabidopsis leaf vascular development
Magazine article from: Plant Physiology; 3/1/2003; ; 700+ words
; Auxin Signaling in Arabidopsis Leaf Vascular Development1 A number of observations have implicated auxin in the formation of vascular tissues in plant...vascular strand formation in response to local auxin application, the effects of impaired auxin...
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Auxin Receptor Hides in Plain Sight
Magazine article from: The Scientist; 5/1/2007; ; 700+ words
; ...by a small molecule such as auxin. "The mechanism is novel...organism," says Estelle. Auxin's mode of control of gene...expression is elusive, and synthetic auxins are used as selective herbicides...Breaking an Animal Paradigm "The auxin story has been very difficult...
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Auxin Responsiveness of a Novel Cytochrome P450 in Rice Coleoptiles1
Magazine article from: Plant Physiology; 12/1/2003; ; 700+ words
; An early auxin-induced gene was isolated from rice...indole-3-acetic acid. This induction by auxin could not be suppressed by cycloheximide. Depletion of segments from endogenous auxin reduced the amount of CYP87A3 transcripts...
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Auxin acts in xylem-associated or medullary cells to mediate apical dominance
Magazine article from: Plant Cell; 2/1/2003; ; 700+ words
; A role for auxin in the regulation of shoot branching was...which proposes that apically derived auxin is transported basipetally directly into...observations in several species have shown that auxin does not enter axillary buds directly...
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AUXIN RESPONSE FACTOR7 Restores the Expression of Auxin-Responsive Genes in Mutant Arabidopsis Leaf Mesophyll Protoplasts(W)
Magazine article from: Plant Cell; 7/1/2005; ; 700+ words
; AUXIN RESPONSE FACTOR? (ARF7) is one of five ARF transcriptional...activators in Arabidopsis thaliana that is proposed to regulate auxin-responsive expression of genes containing TGTCTC auxin response elements in their promoters. An Arabidopsis mutant...
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Auxin Dynamics after Decapitation Are Not Correlated with the Initial Growth of Axillary Buds1
Magazine article from: Plant Physiology; 7/1/2005; ; 700+ words
; ...roles identified for the plant hormone auxin is the mediation of apical dominance...decapitated plants. We have tested whether auxin inhibits the initial stage of bud release...rigorous examination of the dynamics of auxin level, auxin transport, and axillary...
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Auxin-Dependent Cell Division and Cell Elongation. 1-Naphthaleneacetic Acid and 2,4-Dichlorophenoxyacetic Acid Activate Different Pathways1
Magazine article from: Plant Physiology; 3/1/2005; ; 700+ words
; ...of any exogenous auxin. The data are discussed...the two different auxins activate two different...differentiation. Auxins control several fundamental...physiological responses to auxin, the primary steps...cell division to auxin has been shown recently...2002). Different auxins ...
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Auxin Regulates Arabidopsis Anther Dehiscence, Pollen Maturation, and Filament Elongation(W)
Magazine article from: Plant Cell; 7/1/2008; ; 700+ words
; ...localization, synthesis, transport, and effects of auxin on the processes occurring late in Arabidopsis...preanthesis filament elongation. Expression of auxin-sensitive reporter constructs suggests that auxin effects begin in anthers between the end of...
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Auxin and ethylene response interactions during Arabidopsis root hair development dissected by auxin influx modulators
Magazine article from: Plant Physiology; 12/1/2002; ; 700+ words
; The plant hormones auxin and ethylene have been shown to play important...development. However, cross talk between auxin and ethylene makes it difficult to understand...ethylene-insensitive mutant ein2-1, and auxin influx mutants auxl-7, auxl-22...
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Auxin regulates lateral meristem activation in developing gametophytes of Ceratopteris richardii.
Magazine article from: Canadian Journal of Botany; 10/1/2006; ; 700+ words
; ...This study investigates the auxin regulation of lateral meristem...from the pinna tip. Exogenous auxin inhibits main root and lateral...and Kiriluk 1984). Thus, auxins are important for the regulation...Considerable evidence shows that auxin controls pattern formation and...
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auxin
Book article from: The Columbia Encyclopedia, Sixth Edition
auxin , plant hormone that...direction of plant growth. Auxins include both naturally...naturally, and synthetic auxins (e.g., 2,4...different amounts of auxins, a fact used to advantage...The principal natural auxin is indoleacetic acid...
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auxin-binding protein
Book article from: A Dictionary of Biology
auxin-binding protein A protein found in plant cells that binds auxins and thus may act as the initial receptor...cells. According to one model, auxin stimulates the cell by binding to an auxin-binding protein (ABP) on the...
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Hormones, Plant
Book article from: Biology
...pathways are available. Because auxins can have an effect in very low...regulate synthesis and disassembly of auxin very precisely. Auxins are produced in young shoots and...root. This polar movement of auxin is not well understood but requires...
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Hormones
Book article from: Plant Sciences
...hormones discovered were the auxins. (The term auxin is derived from a Greek...base. This polarity of auxin movement was an inherent...Other less-investigated auxins include phenyl-acetic...long used as a synthetic auxin but found to exist in...
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Phototropism
Encyclopedia entry from: The Gale Encyclopedia of Science
...diffused into the agar blocks and he named this substance auxin. The auxin that Went studied was subsequently identified by chemists...phototropism, the Cholodny-Went theory proposes that (a) auxin is synthesized in the coleoptile tip; (b) the coleoptile...
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