Selenite treatment induces nitro-oxidative stress and decreases viability in Indian mustard
Selenium (Se) is an essential microelement for all living organisms, except higher plants, where it has not been proven yet. Like other micronutriens, non-optimal amounts of Se in organisms has negative effects. Some agricultural crops can accumulate large amounts of Se, that decreases the yield and...
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| Dokumentumtípus: | Könyv része |
| Megjelent: |
2016
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
22 |
| Kulcsszavak: | Növénybiológia, Agrokémia, Talajtan, Trágyázás |
| Online Access: | http://acta.bibl.u-szeged.hu/56127 |
| Tartalmi kivonat: | Selenium (Se) is an essential microelement for all living organisms, except higher plants, where it has not been proven yet. Like other micronutriens, non-optimal amounts of Se in organisms has negative effects. Some agricultural crops can accumulate large amounts of Se, that decreases the yield and renders it harmful for consumption. In our study, we examined the long-term effects of selenite on secondary stress processes, in order to reveal molecular mechanisms of Se toxicity. We examined indian mustard (Brassica juncea L.), which is a secondary Se accumulator agricultural crop. Plants were precultivated in hydroponic culture for nine days and treated with 0 µM (control), 20 µM, 50 µM or 100 µM sodium selenite for seven days. Among reactive nitrogen species, the level of nitric oxide remained at control level in case of all treatment concentrations. The two reactive oxygen species, superoxide radical and hydrogen peroxide had elevated concentrations in case of 100 µM sodium selenite treatment. Peroxynitrite, a molecule connected to both families of reactive molecules showed elevated levels as the effect of all selenite concentrations. Selenite induced lipid peroxidation in the root tips of Brassica, while, protein tyrosine nitration only slightly intensified compared to control plants. Viability significantly decreased in root tips of 50 and 100 µM sodium selenite-treated plants. In supraoptimal concentrations selenite disturbs the natural homeostasis of ROS and RNS resulting in secondary nitro-oxidative stress, which is partly responsible for the Se-induced viability loss. |
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| Terjedelem/Fizikai jellemzők: | 390-394 |
| ISBN: | 978-963-306-507-5 |