Effects of Jasmonic Acid on the Root, Stem and Leaf Anatomy of Radish Seedlings

Abstract

In this work, the effects of various concentrations of jasmonic acid on the root, stem and leaf anatomy of radish seedlings were studied. Although jasmonic acid concentrations mostly increased the root diameter, root hair number and epidermis cell size in comparison with roots of control seedlings grown in distilled water medium, they generally decreased the cortex zone thickness, endodermis cell length, vascular cylinder diameter, protoxylem and metaxylem width and trachea diameter. As for the stem anatomy, many of the concentrations stimulated more or less the stem diameter, cuticle thickness and epidermis cell width while they usually
reduced the cortex zone thickness, vascular bundle width and trachea diameter. On the other hand, the concentrations used mostly
increased the stomata number and index in the lower surface, epidermis cell width in the upper surface and leaf thickness, whereas they generally decreased the stomata number, width and index in the upper surface, stomata length and epidermis cell width in the lower surface, epidermis cell number in both surfaces and distance between vascular bundles