Relationship between the activity of the ethylene-forming enzyme and the level of intracellular 2,4-dichlorophenoxyacetic acid in pear cell cultures in vitro

Reference Report for IND85080627

Title:	Relationship between the activity of the ethylene-forming enzyme and the level of intracellular 2,4-dichlorophenoxyacetic acid in pear cell cultures in vitro
Authors:	Balague, C., Pech, J.C.
Source:	J. Plant Growth Reg. 1985, 4(2):81-89
Abstract:	Ethylene production by auxin-dependent pear cells (from young fruits of the cv. Passe Crassane) cultured in vitro fell rapidly when they were deprived of 2,4-D. This phenomenon was associated with a decrease in ACC production. Readdition of 2,4-D caused a resumption of ACC production and ethylene synthesis. Ethylene-forming enzyme (EFE) activity, although never limiting, decreased sharply during 2,4-D depletion and rose again upon addition of 2,4-D. This increase in the EFE activity was not a rapid response to 2,4-D, since it required several hours. Changes in EFE activity followed the same pattern as changes in 2,4-D concentration; the decrease in EFE activity was also concomitant with a decrease in the ability of 2,4-dinitrophenol to inhibit ethylene production. The possible role of auxins in the modulation of EFE activity is discussed.

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