Effets physiologiques de l'atrazine à doses sublétales sur Lemna minor. V. Influence sur l'ultrastructure des chloroplastes

Abstract

A sublethal concentration of 0.25 ppm of atrazine produced many ultrastructural changes on the chloroplasts of mesophyll cells of Lemna minor L., cultivated aseptically in a mineral solution. The number of grana per chloroplast increased, whereas the intralamellar vesicles disappeared and outgrowths formed at the ends of chloroplasts. The grana of treated chloroplasts showed a reduction in the number of lamellae and formed a very dense network. The stroma of the same chloroplasts was reduced and accumulated osmiophilic globules.