Uptake, accumulation and some biochemical responses in Raphanus sativus L. to zinc stress

• Published in: African journal of biotechnology Vol. 10; no. 32; pp. 5993 - 6000
• Main Authors: Koesesakal, T, Yuezbasioglu, E, Kaplan, E, Baris, C, Yuezbasioglu, S, Beliyermis, M, Cevahir-Oez, G, Uenal, M
• Format: Journal Article
• Language: English
• Published: 04.07.2011
• Subjects: Raphanus sativus
• ISSN: 1684-5315; 1684-5315

The responses of radish (Raphanus sativus L.) to increasing concentrations of ZnCl sub(2) (1, 5 and 10 mM) in Hoagland nutrient medium were studied. Under the conditions of these increasing zinc concentrations, the highest zinc accumulation was obtained in the roots of the plants treated with 10 mM applications. The zinc concentration in the vegetative parts, was highest in the root and was lowest in the cotyledons. The highest bioconcentratioh factor (BCF) value was detected in the roots in 5 mM zinc applications. When compared with the control, total zinc uptake was observed to increase in 1, 5 and 10 mM ZnCl sub(2) treatments. The total accumulation rate (TAR) for zinc was highest in 10 mM ZnCl sub(2) treatment, while the lowest TAR was observed in radish plants exposed to 1 mM ZnCl sub(2). Plants treated with 5, 10 mM ZnCl sub(2) showed significant decreases in chlorophyll (Chl a, Chl b, Chl a/b) and carotenoid content compared with the control. Peroxidase (POD) activity especially in radish roots: increased significantly with increasing concentrations of ZnCl sub(2) (5 and 10 mM) while the total protein amount decreased when compared with the control. The results of this study showed that, radish plants could tolerate the negative effects of zinc stress up to 1 mM ZnCl sub(2) concentration and that in zinc concentrations of 5 mM and abovetoxic effects were existent.