ABSTRACT
Researchers became progressively more curious about new, efficient products and about the basic mechanisms of stimulation. The variations in the total adenine nucleotide pool and especially the decrease in the ATP content are among the earliest known biochemical characteristics affected by ethephon stimulation. Hamzah and Gomez carried out a comprehensive examination of the effects of stimulation on bark anatomy; they noticed that treatments had no significant effects on the physical properties of bark and nearly all cell characteristics. The effect of stimulation has been mainly ascribed to an extension of the drainage area for a long period of time. Ribaillier reported that lutoids from stimulated trees gained new properties as assessed by migration on a sucrose gradient. A troublesome observation can be made concerning lutoids. The favorable role of ethylene in onion and leek bulb formation may be due to its effect on the translocation of the assimilates. A direct and rapid action of ethylene on membranes is not excluded.
