Auxin, any of a group of plant hormones that regulate growth, particularly by stimulating cell elongation in stems.

Auxin participates in phototropism, geotropism, hydrotropism and other developmental changes. auxin meaning: 1. a chemical substance that controls growth in plants 2. a chemical substance that controls growth…. Several plant seedlings were prepared in a gelatin block; gelatin does not affect the biological, activity of the auxin. Auxin definition is - any of various usually acidic organic substances that promote cell elongation in plant shoots and usually regulate other growth processes (such as root initiation): such as.

Auxins also play a role in cell division and differentiation, in fruit development, in the formation of roots from cuttings, in the inhibition of lateral branching, and in leaf abscission. It is vital to note that the plant does NOT bend towards the light.

Auxin (Science: plant biology) a group of plant growth substances (often called phytohormones or plant hormones), the most common example being indole Acetic Acid (IAA), responsible for raising the ph around cells, making the cell wall less rigid and allowing elongation.
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The auxin was dissolved in a gelatin block; gelatin does not affect the biological activity of the auxin. In a stem, the shaded side contains more auxin and grows longer, which causes the stem to grow towards the light.


Auxin molecules are found in all tissues in a plant. Several plant seedlings were prepared as described above … The uneven distribution of auxin, due to environmental cues, such as unidirectional light or gravity force, results in uneven plant tissue growth, and generally, auxin governs the form and shape of the plant body, direction and strength of growth of all organs, and their mutual interaction. Apparently, I have been writing reviews about auxin for 20 years (Leyser, 1997), and certainly I have been in very good company.Auxin is a much-written-about molecule.

The auxin group of hormones has a wide range of uses in a plant. >auxins,, >cytokinins,, >gibberellins,, >abscisic acid,, >ethylene.

AUXIN BY ANALOGY. auxins include indoleacetic acid, phenylacetic acid, and 4-chloro-indoleacetic acid.

However, they tend to be concentrated in the meristems, growth centers which are at the forefront of growth.These centers release auxin molecules, which are then distributed towards the roots.