Plant Physiology 42:144-152 (1967)
© 1967 American Society of Plant Biologists
Articles
Molecular Requirements for the Biological Activity of Ethylene 1
Stanley P. Burg and
Ellen A. Burg
University of Miami School of Medicine, Miami, Florida 33136
The molecular requirements for ethylene action were investigated using the pea straight growth test. Biological activity requires an unsaturated bond adjacent to a terminal carbon atom, is inversely related to molecular size, and is decreased by substitutions which lower the electron density in the unsaturated position. Evidence is presented that ethylene binds to a metal containing receptor site. CO2 is a competitive inhibitor of ethylene action, and prevents high concentrations of auxin (which stimulate ethylene formation) from retarding the elongation of etiolated pea stem sections. It is suggested that CO2 delays fruit ripening by displacing the ripening hormone, ethylene, from its receptor site. Binding of ethylene to the receptor site is also impeded when the O2 concentration is lowered, and this may explain why fruit ripening is delayed at low O2 tensions.
1 This investigation was supported by research grants EF-00214 and EF-00782 from the United States Public Health Service, Division of Environmental Engineering and Food Protection, and was carried out while S. P. Burg was the recipient of Career Research Development Award 1-K3-GM-6871 from the USPHS.
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