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Acetabularia mediterranea and Ethylene: Production in Relation with Development, Circadian Rhythms in Emission, and Response to External Application

par Vanden Driessche Oedenkoven, Thérèse ;Kevers, Claire;Collet, Marc;Gaspar, Thomas
Référence Journal of plant physiology, 133, 5, page (635-639)
Publication Publié, 1988

Article révisé par les pairs

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Résumé :

Whole Acetabularia cells evolved ethylene with a decreasing rate in the progression of development, the ultimate stage being cap formation. The algae retained endogenous ethylene in a similar manner. The younger the algae, the higher their capacity to convert exogenously supplied ACC to ethylene. There was a circadian rhythm of ethylene production, peaking in the middle of the light period. Anucleated algae also produced ethylene although at a lower rate, but with the same general circadian pattern. Acetabularia extracts contained ACC and a conjugated form of it, with higher levels at younger stages. Ethephon (10−4 M) had no effect on algal growth but influenced cap formation when applied either continuously (the treatment beginning at defined time points in the 24 h cycle) or in pulses; the efficiency of both types of treatments greatly depended on the circadian time of application. © 1988, Gustav Fischer Verlag, Stuttgart. All rights reserved.