The roles of three functional sulphate transporters involved in uptake and translocation of sulphate in Arabidopsis thaliana

A - Papers appearing in refereed journals

Takahashi, H., Watanabe-Takahashi, A., Smith, F. W., Blake-Kalff, M. M. A., Hawkesford, M. J. and Saito, K. 2000. The roles of three functional sulphate transporters involved in uptake and translocation of sulphate in Arabidopsis thaliana. The Plant Journal. 23 (2), pp. 171-182.

AuthorsTakahashi, H., Watanabe-Takahashi, A., Smith, F. W., Blake-Kalff, M. M. A., Hawkesford, M. J. and Saito, K.
Abstract

To investigate the uptake and long-distance translocation of sulphate in plants, we have characterized three cell-type-specific sulphate transporters, Sultr1;1, Sultr2;1 and Sultr2;2 in Arabidopsis thaliana. Heterologous expression in the yeast sulphate transporter mutant indicated that Sultr1;1 encodes a high-affinity sulphate transporter (K-m for sulphate 3.6 +/- 0.6 mu m), whereas Sultr2;1 and Sultr2;2 encode low-affinity sulphate transporters (K-m for sulphate 0.41 +/- 0.07 mm and greater than or equal to 1.2 mm, respectively). In Arabidopsis plants expressing the fusion gene construct of the Sultr1;1 promoter and green fluorescent protein (GFP), GFP was localized in the lateral root cap, root hairs, epidermis and cortex of roots. beta-glucuronidase (GUS) expressed with the Sultr2;1 promoter was specifically accumulated in the xylem parenchyma cells of roots and leaves, and in the root pericycles and leaf phloem. Expression of the Sultr2;2 promoter-GFP fusion gene showed specific localization of GFP in the root phloem and leaf vascular bundle sheath cells. Plants continuously grown with low sulphate concentrations accumulated high levels of Sultr1;1 and Sultr2;1 mRNA in roots and Sultr2;2 mRNA in leaves. The abundance of Sultr1;1 and Sultr2;1 mRNA was increased remarkably in roots by short-term stress caused by withdrawal of sulphate. Addition of selenate in the sulphate-sufficient medium increased the sulphate uptake capacity, tissue sulphate content and the abundance of Sultr1;1 and Sultr2;1 mRNA in roots. Concomitant decrease of the tissue thiol content after selenate treatment was consistent with the suggested role of glutathione (GSH) as a repressive effector for the expression of sulphate transporter genes.

KeywordsPlant Sciences
Year of Publication2000
JournalThe Plant Journal
Journal citation23 (2), pp. 171-182
Digital Object Identifier (DOI)doi:10.1046/j.1365-313x.2000.00768.x
PubMed ID10929111
Open accessPublished as non-open access
Funder project or code442
Project: 031612
Project: 014145
ISSN09607412
0960-7412
PublisherWiley

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