• Citer

Effects of morphactins on the chloroplast ultrastructure

par Vanden Driessche Oedenkoven, Thérèse ;Cerf, Evelyne
Référence Journal of Ultrastructure Research, 59, 2, page (140-148)
Publication Publié, 1977

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

The effect of the anti-auxin substances, the morphactins, on the chloroplast ultrastructure of Acetabularia mediterranea has been examined at the beginning and the middle of the light phase (circadian time, c.t. 0 and 6, respectively). At c.t. 0 there is a significantly higher proportion of thylakoids involved in pseudograna in the morphactin-treated algae than in the corresponding control algae. At c.t. 6 the same tendency may be found (at that time the controls have only few pseudograna). At both times, the thickness of the thylakoids is significantly smaller than in the controls. In the morphactin-treated algae, the usual thylakoid swellings are less frequent but bulky. The number of polysaccharide granules per chloroplast is increased at c.t. 0 as compared with controls and decreased at c.t. 6 as opposed to their normal circadian alternation. The results are discussed with reference to hormonal theories, chloroplast activities and circadian rhythmicity. © 1977 Academic Press, Inc.