auxin

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auxin

(ôk`sĭn), plant hormone that regulates the amount, type, and direction of plant growth. Auxins include both naturally occurring substances and related synthetic compounds that have similar effects. Auxins are found in all members of the plant kingdom. They are most abundantly produced in growth areas (meristem), e.g., root and shoot tips, but are also produced elsewhere, e.g., in the stems and leaves. The method of dispersal throughout the plant body is not yet fully understood. Auxins affect numerous plant processes, e.g., cell division and elongation, autumnal loss of leaves, and the formation of buds, roots, flowers, and fruit. They are also responsible for many forms of tropismtropism
, involuntary response of an organism, or part of an organism, involving orientation toward (positive tropism) or away from (negative tropism) one or more external stimuli.
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. It is known that phototropism is due to the inhibition of auxins by light; the cells on that side of a plant exposed to light do not divide or grow as quickly as those on the shaded side, and thus the plant grows toward the light source. Auxins are widely used commercially to produce more vigorous growth, to promote flowering and fruiting and also root formation in plants not easily propagated by stem cuttings, to retard fruit drop, and to produce seedless varieties (e.g., of tomatoes) by parthenogenetic fruiting. Only minute amounts of auxins occur naturally, and synthetic auxins (e.g., 2,4-D) must be administered in carefully prescribed doses, since excessive concentration produces usually fatal abnormalities. However, different species of plants react to different amounts of auxins, a fact used to advantage as a method of weedweed,
common term for any wild plant, particularly an undesired plant, growing in cultivated ground, where it competes with crop plants for soil nutrients and water. In their natural habitat, wildflowers and herbs not only provide beauty but function in many useful ways, e.g.
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 control. The principal natural auxin is indoleacetic acid; other common but less frequent plant hormones include the gibberellins, lactones, and kinins.

auxin

[′ȯk·sən]
(biochemistry)
Any organic compound which promotes plant growth along the longitudinal axis when applied to shoots free from indigenous growth-promoting substances.
References in periodicals archive ?
The hormone rooting powder is more important on the geranium than the fuchsia, but both benefit from its use.
These cuttings don't need hormone rooting powder and should be inserted into a pot of sandy compost, watered well in, and sealed with a polythene bag or put in a propagator.
Trim them just below a leaf joint, making them about 4cm long an d dip the cut in hormone rooting powder before inserting them into individual pots of compost.
Dip the bases of the cuttings in a hormone rooting powder and push them gently into the rooting medium.
Trim them just below a leaf joint, treat the cut end with hormone rooting powder and root them in pots in a propagator or under a polythene tent on the windowsill.
After removing the leaves, except for two or three at the top, and snipping off the thorns from the bottom six inches, the cuttings are dipped in rooting powder, and inserted six inches into well-prepared sandy soil with some bone meal added, six inches apart.
N Dip the cut end in hormone rooting powder or liquid, covering the lower 6mm, (1/4in), before inserting it in a pot filled with seed compost.
Remove the bottom leaves, dip in rooting powder and plant half inch into pots of seed and cutting compost.
Cut beneath a leaf node where there is a concentration of growth hormones, dip in some rooting powder and plant in a pot.
Dip the base of the cutting in a hormone rooting powder. Camellia cuttings root most successfully in a mist propagation but if one is not available, cover the pot with a polythene bag and stand it in a warm, light place indoors.
When the shoots emerge, make a clean cut below a leaf joint and dip the base of each in hormone rooting powder. Then insert them 1in deep in individual pots.
Officers also discovered rooting powder, 20 bottles of fertilizer and spare bulbs, along with a bag of cannabis.