Auxin (also known as indole-3-acetic acid, IAA) represents an ancient signaling molecule of plants that also exerts bioactive actions on yeast and animal cells. Importantly, IAA emerges as a new anticancer agent due to the ability of oxidatively activated IAA to selectively kill tumor cells. IAA acts as a pheromone-like molecule in brown algae, whereas the hormone concept of IAA dominates curre...

Inflorescence stalks produced the highest amount of ethylene in response to IAA as compared with other plant parts tested. Leaf age had an effect on IAA-induced ethylene with the youngest leaves showing the greatest stimulation. The highest amount of IAA-induced ethylene was produced in the root or inflorescence tip with regions below this producing less. Inflorescence stalks treated with IAA, ...

Seeds of oat, coconut, soybean, sunflower, rice, millet, kidney bean, buckwheat, wheat, and corn and vegetative tissue of oat, pea, and corn were assayed for free indole-3-acetic acid (IAA), esterified IAA, and peptidyl IAA. Three conclusions were drawn: (a) all plant tissues examined contained most of their IAA as derivatives, either esterified or as a peptide; (b) the cereal grains examined c...

Whether coarctation or interruption (IAA) of the aorta, ostensibly similar in morphology (and management), result from the same or different developmental errors can be inferred by examining the pattern of associated anomalies. Among the most common associated lesions, especially in IAA, is ventricular septal defect (VSD). Although muscular and perimembranous VSDs are the most common in aortic ...

Suimnwijitiry. The potential role of indoleactic acid (IAA)-oxidase as an in vivo abscission regullating system in the cotton (Gossvpiutiii hirsttuni L.) cotyledonary explant was investigated. Phenols (utsutally monophenols), which are cofactors of cotton IAA-oxidase in vitro, accelerated abscission. Phenols (tustually orthodihydroxyphenols), which inhibit cotton IAA-oxidase in vitro, inhibited...

The content of indoleacetic acid (IAA) was determined in dry and germinating seeds of French bean (Phaseolus vulgaris), sugar maize (Zea mays), and Scots pine (Pinus silvestris). IAA was found in both the dry and the soaked seeds of the three species examined. The amount of IAA per gram fresh weight was extremely different in the three species whereas the variation between different harvests of...

The Agrobacterium tumefaciens T-DNA gene iaaM was introduced by leaf-disc transformation into transgenic tobacco (Nicotiana tabacum) plants expressing the iaaH gene. Regenerated calli were screened for the presence of indole-3-acetamide (IAM), by gas chromatography-multiple ion monitoring-mass spectrometry, and IAM-containing calli were further analyzed for free and conjugated indoleacetic acid...

Imidazole-4-acetic acid-ribotide (IAA-RP), an endogenous agonist at imidazoline receptors (I-Rs), is a putative neurotransmitter/regulator in mammalian brain. We studied the effects of IAA-RP on excitatory transmission by performing extracellular and whole cell recordings at Schaffer collateral-CA1 synapses in rat hippocampal slices. Bath-applied IAA-RP induced a concentration-dependent depress...

Phytohormone indole-3-acetic acid (IAA) is the most common naturally occurring and most thoroughly studied plant growth regulator. Microbial synthesis of IAA has long been known. Microbial IAA biosynthesis has been proposed as possibly occurring through multiple pathways, as has been proven in plants. However, the biosynthetic pathways of IAA and the ecological roles of IAA in yeast have not be...

Genetic evidence in Arabidopsis (Arabidopsis thaliana) suggests that the auxin precursor indole-3-butyric acid (IBA) is converted into active indole-3-acetic acid (IAA) by peroxisomal beta-oxidation; however, direct evidence that Arabidopsis converts IBA to IAA is lacking, and the role of IBA-derived IAA is not well understood. In this work, we directly demonstrated that Arabidopsis seedlings c...