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Lappartient AG, Touraine B. Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione). Plant Physiol. 1996;111(1):147-157doi: 10.1104/pp.111.1.147.
Lappartient, A. G., & Touraine, B. (1996). Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione). Plant physiology, 111(1), 147-157. https://doi.org/10.1104/pp.111.1.147
Lappartient, A. G., and Touraine, B.. "Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione)." Plant physiology vol. 111,1 (1996): 147-157. doi: https://doi.org/10.1104/pp.111.1.147
Lappartient AG, Touraine B. Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione). Plant Physiol. 1996 May;111(1):147-157. doi: 10.1104/pp.111.1.147. PMID: 12226281; PMCID: PMC157821.
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Plant Physiol. 1996 May;111(1):147-157. doi: 10.1104/pp.111.1.147.

Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione).

Plant physiology

A. G. Lappartient, B. Touraine

Affiliations

  1. Biochimie et Physiologie Vegetales, Ecole Nationale Superieure d'Agronomie de Montpellier/Institut National de la Recherche Agronomique/Centre National de la Recherche Scientifique Unite de Recherche Associee 573, 34060 Montpellier Cedex 1, France.

PMID: 12226281 PMCID: PMC157821 DOI: 10.1104/pp.111.1.147

Abstract

The activity of ATP sulfurylase extracted from roots of intact canola (Brassica napus L. cv Drakkar) increased after withdrawal of the S source from the nutrient solution and declined after refeeding SO42- to S-starved plants. The rate of SO42- uptake by the roots was similarly influenced. Identical responses were obtained in SO42- -fed roots when one-half of the root system was starved for S. The internal levels of SO42- and glutathione (GSH) declined after S starvation of the whole root system, but only GSH concentration declined in +S roots of plants from split root experiments. The concentration of GSH in phloem exudates decreased upon transfer of plants to S-free solution. Supplying GSH or cysteine to roots, either exogenously or internally via phloem sap, inhibited both ATP sulfurylase activity and SO42- uptake. Buthionine sulfoximine, an inhibitor of GSH synthesis, reversed the inhibitory effect of cysteine on ATP sulfurylase. It is hypothesized that GSH is responsible for mediating the responses to S availability. ATP sulfurylase activity and the SO42- uptake rate are regulated by similar demand-driven processes that involve the translocation of a phloem-transported message (possibly GSH) to the roots that provides information concerning the nutritional status of the leaves.

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