Auxin is phytohormones and the first group of plant hormones.Auxin was discovered by botanist . F.W.Went in 1928 from the tips of Avaena (oat) coleoptiles. On the basis of oat coleoptiles curvature test,he demonstrated that this substance can induce growth .
One of the widespread auxins occurring in plant is Indole -3-acetic acid . ( IAA ). IAA is the principal natural auxin present in the plants. A number of synthetic auxins are :
- Naphthalene acetic acid ( NAA)
- Indole butyric acid ( IBA )
- Indole -3- acetonitrile
- Indole -3- acetaldehyde
- Indole -3-Pyruvic acid
Auxins are synthesized in the root and shoot apices and young leaves . It moves from apex to base by diffusion through phloem .
Role of auxins are :
- Cell elongation
- Apical dominance
- Controlling abscission
- Root initiation
- Cell division in vascular cambium
Uses of auxins are:
- Adventitious root initiation
- Weed control
- Flower initiation
- Parthenocarpy
- Thinking of crops
- Inhibition of stem sprouting
- Prevent pre harvest fruit drop
- Root initiation and callus production in tissue culture.
upvoted @upama by @mrblu
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Interesting stuff. Does auxin happen to have an organic delivery system?
Thanks .
Not sure about the question...
However, if you meant, if there is internal transport system within plant, than there is. And it is one of the wonders of Nature. While there exist also passive route of transport in the plant (being carried in the veins within the sap), it is the active transport - dubbed "polar auxin transport" which completely define plant.
And I mean it. Without perfect spatio-temporal coordination of transport of auxin molecules between various cells within the plant body .. there would be no body, no shape, no growth. Auxin can be understood as a kind of unit of information in cell-to-cell communication. Different cells in a body have different task and they have to get the right task at the right position at the right time.
There is are no nerves in plants. The body still needs to be cohesive coordinated internally communicating unit.
How does it achieve it?
Slowly - by exchanging, transmuting (metabolism) and perceiving units of auxin from and to their surroundings. (And to a lesser extent of other phytohormones too).
Without this coordination - all the plant cells within body would be more or less the same and instead of body growing to the light and moisture - we would get unorganized heap of biological matter without capacity to survive on their own.
And yes all of this is driven by internal "delivery system". The delivery system in its own right is difficult to explain in detail. In short it is composed of various proteins on the membranes serving as directional pumps ... some are pumping in, some pumping out (of the cell) ... and all of them has different set of regulations from the other ones.
To know more .. try to google out "Polar auxin transport" and "auxin efflux carriers"
new information about the plant hormones movement that's great!
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