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Asian Journal of Plant Sciences
Year: 2008  |  Volume: 7  |  Issue: 3  |  Page No.: 251 - 259

Iron Toxicity in Rice (Oryza sativa L.), under Different Potassium Nutrition

Pooyan Mehraban, Ahmad Abdol Zadeh and Hamid Reza Sadeghipour    

Abstract: In the present study, the effects of iron toxicity in rice and the possible roles of potassium nutrition in the alleviation of iron toxicity are studied. Rice plants (Oryza sativa L.) were cultured in a sand substrate and submerged with Yoshida nutrient solution in greenhouse. Two weeks old rice plants were received various treatments for four weeks. The experiments were carried out in a completely randomized design as factorial. Factor one was iron at five levels (10, 50, 100, 250 and 500 mg L-1) in the form of Fe-EDTA and factor two was potassium which was supplied as KCl (control, 200 and 400 mg L-1). Maximal plant growth occurred at iron concentration of 10 and 50 mg L-1 and growth reduction due to iron toxicity was observed at iron concentration of 250 and 500 mg L-1. Potassium nutrition could not alleviate effects of iron stress on plant growth. Excess iron caused higher iron and lower potassium concentrations in both roots and shoots as compared with the 10 mg L-1 iron-fed plants and iron accumulation in plants was not affected by potassium nutrition. Toxic iron levels increased hydrogen peroxide, phenolica contents, lipid peroxidation and peroxidase activity while it reduced the activity of catalase. Along with the aforementioned changes related to the oxidative stress, total chlorophyll, soluble protein and carbohydrate contents declined and amino acid content increased under toxic iron levels. The results indicate that iron toxicity induced greater oxidative stress in rice plants and supplemental potassium was ineffective in preventing iron accumulation in shoots and consequently did not ameliorate plant growth under iron toxic levels.

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