The response of tomato (Lycopersicon esculentum) to different concentrations of inorganic and organic compounds of arsenic
Tlustos, P.(Czech University of Agriculture, Praha (Czech Republic). Department of Agrochemistry and Plant Nutrition | Szakova , [email protected] | Pavlikova, D. | Balik, J.
Tomato plants were cultivated in greenhouse and water solutions of arsenite (As(3)), arsenate (As(5)), methy-larsonic acid (MA) and dimethylarsinic acid (DMA) were applied individually into cultivation substrate at two As levels, 5 and 15 mg/ kg of the substrate. Comparing the availability of arsenic compounds increased in order arsenite = arsenate < MA < DMA where the arsenic contents in plants decreased during vegetation period. Within a single plant, the highest arsenic concentration was found in roots followed in decreasing order by leaves, stems, and fruits regardless of arsenic compound applied. Arsenic toxicity symptoms reflected in suppressed growth of plants and a lower number and size of fruits were most significant with DMA treatment. However, the highest accumulation of arsenic by plants growing in the soil containing DMA was caused by higher mobility of this compound in the soil due to its lower sorption affinity. Our results confirmed substantial role of transformation processes of arsenic compounds in soil in uptake and accumulation of arsenic by plants.
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