Iron supply prevents Cd uptake in Arabidopsis by inhibiting IRT1 expression and favoring competition between Fe and Cd uptake
| Autor: | Yong Song Zhang, Xiao Lin He, Xing Xing Liu, Mei Yan Guan, Chong Wei Jin, Shi Kan Fan, Jun Zhu |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
media_common.quotation_subject Mutant Soil Science chemistry.chemical_element Plant Science 010501 environmental sciences 01 natural sciences Competition (biology) Metal Arabidopsis Botany Arabidopsis thaliana 0105 earth and related environmental sciences media_common Cadmium biology fungi Plant physiology biology.organism_classification chemistry visual_art Biophysics visual_art.visual_art_medium Antagonism 010606 plant biology & botany |
| Zdroj: | Plant and Soil. 416:453-462 |
| ISSN: | 1573-5036 0032-079X |
| Popis: | Cadmium (Cd) is a heavy metal that is highly toxic to organisms. Studies have shown that an increasing Fe supply decreases Cd accumulation in plants. In this study, we investigated the mechanism underlying the effect of Fe on Cd uptake. We compared the effects of Fe application on Cd levels in wild-type Arabidopsis thaliana Col-0 and IRT1-null mutant irt1 (loss in function of Fe2+ uptake). In the Fe-Cd alternative rotation treatment, which ensured asynchronous uptake of Fe2+ and Cd2+, the irt1 mutants had a lower Cd level than the Col-0 plants. In addition, an increase in the Fe supply decreased the Cd level in Col-0 plants, accompanied by an inhibition of IRT1 expression in roots. Furthermore, both Col-0 and irt1 plants grown in Fe-Cd alternative rotation treatment, showed higher Cd uptake than those grown in another rotation treatment, which allowed synchronous uptake of Fe2+ and Cd2+. Nevertheless, the differences in Cd uptake between the two rotation treatments were greater in Col-0 plants than in irt1 mutants. Inhibition of IRT1-mediated Cd uptake and enhancement of antagonism between Fe and Cd uptake are two mechanisms involved in the inhibition of Cd uptake by Fe supply. |
| Databáze: | OpenAIRE |
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