Effects of lead, cadmium, va-mycorrhizal fungi and their interactions on the growth of radish plant (Raphanus sativus, L.) [electronic resource].

Includes references.

Lead and cadmium at 100 and 200 ppm decreased length of either root or shoot system and their fresh and dry weights as well as leaf area per plant in both seasons. Photosynthetic pigment concentrations in the leaves; carbohydrate and endogenous phytohormones (IAA, GAJ and cytokinins) concentrations in the shoot system were also decreased, while ABA and accumulation of both lead and cadmium in the root and shoot systems were increased. Cadmium was more concentrated in the shoot, whereas lead in the plant root. Cadmium application led to more deleterious effect compared with lead. On the other hand. inoculation with VA-mycorrhizae increased all the above mentioned parameters. while suppressed not only the accumulation of ABA in the shoot system, but also accumulation of the two applied heavy metals in both root and shoot systems. Anatomically, treatments with lead and cadmium decreased root diameter, cortex thickness. diameter of vascular cylinder and metaxylem vessel diameter. Leaf blade thickness and mesophyll tissue thickness were also decreased due to reducing both palisade and spongy tissue thickness.

Summary in Arabic.

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