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Inter‐organ signaling in plants: regulation of ATP sulfurylase and sulfate transporter genes expression in roots mediated by phloem‐translocated compound

Inter‐organ signaling in plants: regulation of ATP sulfurylase and sulfate transporter genes... Sulfate uptake and ATP sulfurylase activity in the roots of Arabidopsis thaliana and Brassica napus were enhanced by S deprivation and reduced following resupply of SO42–. Similar responses occurred in split‐root experiments where only a portion of the root system was S‐deprived, suggesting that the regulation involves inter‐organ signaling. Phloem‐translocated glutathione (GSH) was identified as the likely transducing molecule responsible for regulating SO42– uptake rate and ATP sulfurylase activity in roots. The regulatory role of GSH was confirmed by the finding that ATP sulfurylase activity was inhibited by supplying Cys except in the presence of buthionine sulfoximine, an inhibitor of GSH synthesis. In direct and remote (split‐root) exposures, levels of protein detected by antibodies against the Arabidopsis APS3 ATP sulfurylase increased in the roots of A. thaliana and B. napus during S starvation, decreased after SO42– restoration, and declined after feeding GSH. RNA blot analysis revealed that the transcript level of APS1, which codes for ATP sulfurylase, was reduced by direct and remote GSH treatments. The abundance of AST68 (a gene encoding an SO42– transporter) was similarly affected by altered sulfur status. This report presents the first evidence for the regulation of root genes involved in nutrient acquisition and assimilation by a signal that is translocated from shoot to root. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Inter‐organ signaling in plants: regulation of ATP sulfurylase and sulfate transporter genes expression in roots mediated by phloem‐translocated compound

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References (46)

Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1046/j.1365-313X.1999.00416.x
Publisher site
See Article on Publisher Site

Abstract

Sulfate uptake and ATP sulfurylase activity in the roots of Arabidopsis thaliana and Brassica napus were enhanced by S deprivation and reduced following resupply of SO42–. Similar responses occurred in split‐root experiments where only a portion of the root system was S‐deprived, suggesting that the regulation involves inter‐organ signaling. Phloem‐translocated glutathione (GSH) was identified as the likely transducing molecule responsible for regulating SO42– uptake rate and ATP sulfurylase activity in roots. The regulatory role of GSH was confirmed by the finding that ATP sulfurylase activity was inhibited by supplying Cys except in the presence of buthionine sulfoximine, an inhibitor of GSH synthesis. In direct and remote (split‐root) exposures, levels of protein detected by antibodies against the Arabidopsis APS3 ATP sulfurylase increased in the roots of A. thaliana and B. napus during S starvation, decreased after SO42– restoration, and declined after feeding GSH. RNA blot analysis revealed that the transcript level of APS1, which codes for ATP sulfurylase, was reduced by direct and remote GSH treatments. The abundance of AST68 (a gene encoding an SO42– transporter) was similarly affected by altered sulfur status. This report presents the first evidence for the regulation of root genes involved in nutrient acquisition and assimilation by a signal that is translocated from shoot to root.

Journal

The Plant JournalWiley

Published: Apr 1, 1999

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