Cadmium(Cd) is a non-essential and toxic element, without any metabolic significance, whereas zinc(Zn) is an essential element. Since both Cd and Zn have similar electronic configurations and valence, the increase of Zn in rhizosphere can adjust the toxic effects of Cd. To study the effects of Cd and Zn on growth and yield of Beta vulgaris L. cv. dark red, a greenhouse experiment was carried out in a factorial experiment with a randomized complete block design and four replications. Three levels of Cd (0, 45 and 90 µM) and three levels of Zn(0.5, 155 and 310 µM) were added to nutrient solution. The seed bed was perlite and the seeds of dark red cultivar of red beet were planted. Results showed that Cd application significantly increased Cd concentration but decreased Zn concentration in leaves and roots. Application of Cd significantly decreased photosynthesis, chlorophyll content, leaf number, leaf area and yield in plants. Application of Cd in 90 µM (Zn1Cd2) decreased dry weight, leaf area, photosynthesis, chlorophyll content and Zn concentration by 72%,32%,39%,29% and 60% respectively, compared with control(Zn1Cd0). Application of Zn in nutrient solution significantly increased yield, chlorophyll content and leaf number, leaf area and also Zn concentration in leaves and roots of red beet. Application of Zn increased Cd concentration in leaves and roots of red beet. The interaction between Zn and Cd in chlorophyll content was statistically significant and application of Zn alleviated Cd toxic effect on chlorophyll degradation |
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