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| Response of safflower (Carthamus tinctorius L.) seedlings to cobalt toxicity |
Muhittin Dogan, Serap Sahin Yigit, Gulcan Cinar
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Abstract:
The present study was carried out to determine the toxic effects of different Co concentrations on safflower seedlings. The study was conducted in a controlled climate cabinet and a hydroponic medium was preferred for Co application to the seedlings. After two weeks of Co application, Co contents, some physiological changes and nutrient levels were determined. Cobalt contents of safflower seedling parts were found to increase with applied Co concentration. In addition, it was determined that the Co content was ordered as root>stem>leaf. There was a decrease in photosynthetic pigment contents of seedling leaves. On the contrary, total carbohydrate content of the seedling parts generally increased in a dose-dependent manner. In addition, increases in phenolic compounds of the above-ground parts of the seedlings were determined. Positive relationships were found between Co contents of seedling organs and malondialdehyde (MDA) contents. This clearly showed that Co toxicity caused oxidative stress in seedling cells. While potassium content decreased in root and stem tissues, it increased in leaves. Calcium and Mg contents were generally increased. In addition, increases were found in the Zn contents of the seedling parts, but decreased in the Fe and Cu contents. These results showed that applied Co caused nutrient imbalance in the seedlings.
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