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Hormone |
Ethylene (ET)
The earliest discovery of Ethylene occurred when when lamp post near a greenhouse caused wilting and leaf abscission. - a wikimedia commons image
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Chemical Structure |
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Speculative Overall Role |
Oxygen and maybe other gas deficiency signal |
Growth Direction Tendancies | Broadening or widening |
What is Ethylene's speculative |
Auxin (IAA) |
If overall speculative role is true, where, |
Cells most apt to be oxygen deficient are the interior of roots and flooded roots in general. |
If overall speculative role is true, what |
Exogenous ethylene treatment should show methods for increasing oxygen to the roots such as Aerenchyma tubes or increasing leaf area. Additional measures might include epinasty for pumping out extra water from around the roots, metabolism inhibition and photosynthesis stimulation. |
If overall speculative role is true, what |
Ethylene should inhibit root growth and encourage shoot growth. It should inhibit metabolism and stimulate photosynthesis. It also is known to stimulate the growth of root hairs, a method for increasing the surface area of the root and its absorption of oxygen for local use. |
If overall speculative role is true, |
Ethylene should cause the release of stored Oxygen if there is such a thing. |
If overall speculative role is true, |
Ethylene should be transported from the roots to the shoots, perhaps by rising or bubbling up from the ground as a gas or being transported up as ACC. |
If overall speculative role is true, how should |
Ethylene should generally push nutrients and stimulating/growth hormones out of cells and attract deficiency hormones. Possibly it works with Auxion producing leaves to attract more nutrients to these Oxygen harvesting sites. |
If overall speculative role is true, how |
Ethylene represents a failure of the current methods for harvesting Oxygen, therefore it should break the apical dominance induced by Auxin. |
If overall speculative role is true, how |
Ethylene should generally inhibit cell division although it may stimulate it in shoot areas that are particularly efficient at harvesting Oxygen and therefore making Auxin. |
If overall speculative role is true, how |
Ethylene should inhibit root growth along with Gibberellin and cause the senescence of older roots. It should inhibit the senescence of shoots parts, especially those making Auxin. |
If overall speculative role is true, |
Ethylene is known to broaden plant parts. Its analogue stimulating hormone, Auxin, appropriately lengthens plant cells and tissues. |
Proven Synthesis and Transport |
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Proven Effects |
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