Anatomical changes induced by picloram acroptilon picris

Mikhno, A.N.; Kalinin, F.L.; Lesnevich, L.A.

Botanicheskii Zhurnal (Stsburg). 63(11): 1632-1635


Accession: 004746409

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The effect of lethal concentrations of picloram on the anatomical structure of surface organs and root system of A. picris f. virens during budding was studied. Picloram most actively retarded the differentiation process of cambial cells and biogenesis of the cellular membrane. Such disorders inhibited the formation of the vascular-conduction system and stimulated isodiametric extension of cells in actively growing tissues. Phytotoxic effects occurred relatively quickly: within several hours after treatment, epinasty of the upper part of the stem was visible, with subsequent twisting and chlorosis of the leaves. The primary changes were an increase in diameter and a twisting of cell membranes of the vascular bundle sheaths. The number of chloroplasts decreased. A significant number of them became deformed and spread throughout the entire cell. Polymer carbohydrate products accumulated.