Abstract
Cadmium (Cd) is a highly toxic element for living organisms, hence plants have evolved a variety of detoxification mechanisms. Phytochelatins and glutathione are low-molecular-weight sulfur compounds that function as chelators and play important roles in Cd detoxification. Previous studies have shown that the transcription of the genes involved in sulfate uptake and sulfur assimilation was increased in response to Cd stress. Recently, we reported that Cd-induced sulfate uptake is mainly attributed to the function of SULTR1;2, a high affinity sulfate transporter involved in sulfate uptake from the roots. Another distinct change in sulfate distribution induced by Cd treatment was preferential accumulation of sulfate to the shoots, which is due to the induction of root-to-shoot sulfate transport through xylem. In this study, we compared previous transcriptome data taken with Cd-treated plants to get suggestions about the SULTRs involved in Cd-induced sulfate distribution to shoots. In addition to the induction of SULTR1;1 and SULTR1;2 expressions, we found that the expression of SULTR2;1, a transporter involved in root-to-shoot transport of sulfate, and SULTR4;1 and SULTR4;2, exporters of stored sulfate in vacuole, were increased in roots upon Cd treatment. These SULTRs were suggested as contributors to the increased distribution of sulfate to shoots under Cd exposure.
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Yamaguchi, C., Maruyama-Nakashita, A. (2017). Sulfate Transporters Involved in Cd-Induced Changes of Sulfate Uptake and Distribution in Arabidopsis thaliana . In: De Kok, L., Hawkesford, M., Haneklaus, S., Schnug, E. (eds) Sulfur Metabolism in Higher Plants - Fundamental, Environmental and Agricultural Aspects. Proceedings of the International Plant Sulfur Workshop. Springer, Cham. https://doi.org/10.1007/978-3-319-56526-2_20
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DOI: https://doi.org/10.1007/978-3-319-56526-2_20
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