Effect of abscisic acid on differentiation and ribulose diphosphate carboxylase of chloroplasts |
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| Authors: | Maillard-Sevhonkian Sonia; Pilet Paul-Emile |
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| Institution: | Institute of Plant Biology and Physiology of the University 1005 Lausanne, Pl. de la Riponne, Switzerland |
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| Abstract: | Daucus carota tissues were grown on Murashige-Skoog medium (MS)at different concentrations with abscisic acid (ABA). Sevenbands of chloroplast fractions were obtained on a sucrose gradient.At 10–5M, ABA highly increased chlorophyll and proteinnitrogen content of medium density chloroplasts. With increasingage of the tissues, the most active chloroplasts according totheir 14CO2 fixation were found in smaller numbers. When treatedwith 10–5 M ABA, 34 day-old tissues cultivated in vitroshowed the chloroplast pattern of 110 day-old tissues. The effectof ABA—given to the tissues during a short pretreatmentor continuously present in the culture medium—on the ribulosediphosphate carboxylase activity was analysed. It was foundthat ABA at 10–5 M strongly inhibited 14CO2 fixation. (Received December 20, 1977; ) |
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