auxin

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auxin

(awk′sĭn) [Gr. auxe, increase]
A substance that promotes growth in plant cells and tissues.

auxin

a type of plant growth-regulating substance involved in the growth of cells and several other functions. The most important auxin is indolacetic acid (IAA; see Fig. 194 ), but many other substances have been classified as auxins, using a BIO-ASSAY method developed by Fritz WENT.

The effects of auxins depend on their concentration in the plant. They are most concentrated at the shoot tip and least concentrated in the root, except for small amounts at the root tip. The major effects of auxin are summarized below:

  1. Encourages cell growth by elongation, producing a softening of the MIDDLE LAMELLAE of cell walls.
  2. Stimulates cell division in the PHLOEM of the VASCULAR BUNDLES, so encouraging new growth.
  3. Promotes positive PHOTOTROPISM in shoots by growth of tissues towards the light source.
  4. Promotes GEOTROPISM in all parts of the plant (positive in roots, negative in shoots, due to unequal distributions of the hormone).
  5. Induces APICAL DOMINANCE by suppressing lateral buds.
  6. Induces lateral root formation.
  7. Stimulates fruit development, enabling seedless fruits to be produced artificially. (h) Suppresses ABSCISSION in leaves and fruit. (i) Encourages the formation of wound tissues in injured or diseased plants.

    Auxins have a number of commercial uses, e.g. to promote the rooting of cuttings, regulate plant height, induce flower formation and control fruit set and fruit drop.

auxin

plant hormone.
References in periodicals archive ?
s hrc Dip the lower end in some rooting hormone powder, which will encourage roots to shoot, then plant in your container.
To encourage rooting, it's also a good idea to dip cut ends into a rooting hormone (liquid Dip 'N Grow is easier to use than powdered).
To plant prunings, dip in rooting hormone, then insert deep enough into barely moist soil moix to be stable.
Dip cut end in rooting hormone, then insert it into a flat of soil.
Dip the leafless end in rooting hormone if you like.
You need few supplies: a sharp knife, powdered rooting hormone, sphagnum moss, clear plastic, twine, a new pot, and fresh potting mix.
Dip the cuttings in rooting hormone, then plant in flats or small pots containing a mixture of potting soil and perlite.
To propagate any holly you like, take pencil-size cuttings this month, dip in rooting hormone, and start in a flat of damp sand and peat (bottom heat and a plastic tent over the flat will dramatically increase your rate of success).
Dip cut end in rooting hormone powder, then poke into a flat filled with moist potting soil.
Dip cut end into rooting hormone powder, then insert cutting in a pot or flat filled with a half-and-half mixture of peat moss and perlite, or peat moss and sand.
is of great importance inside and outside of the country and a lot of studies have been carried out on it, but there is not available report regarding effect of rooting hormones of IBA and NAA on the ontogeny aspects of this plant.